Latest / Deep Dive Ortho — Orthopaedic Surgery, AI & Digital Health Podcast. / Kienbock Disease

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Kienbock Disease · Deep Dive Ortho — Orthopaedic Surgery, AI & Digital Health Podcast.

0:00
Imagine a tiny bone in your wrist, no bigger
0:02
than a sugar cube, suddenly losing its lifeline,
0:05
its blood supply. Hmm. What happens then isn't
0:08
just a simple sprain or a minor ache. It's a
0:11
journey into chronic pain, progressive stiffness,
0:14
and actually a surprisingly complex medical condition
0:17
we're diving deep into today. Indeed. We're talking
0:20
about Kinvox disease, a condition that, at its
0:23
core, involves the vascular necrosis, or you
0:25
might hear osteonecrosis, of the lunate bone
0:28
in the wrist. Lunatomalacia is another term you
0:31
might come across. Right, lunatomalacia. It's
0:33
a rare condition, often quite insidious, initially
0:36
mimicking far less serious problems, which must
0:39
make diagnosing it a significant challenge. Exactly.
0:42
And our exploration today isn't just a general
0:44
overview, it's a deep dive, specifically tailored
0:47
to the source materials you provided, a stack
0:50
of articles, research papers, excerpts from various
0:52
medical resources like StatPearls, OrthoBullets,
0:56
the Hand Society, and others, all focusing on
0:58
this specific condition. OK, so our mission,
1:01
leveraging these resources, is to extract the
1:04
most important, insightful information. We want
1:07
to understand precisely what Kinbach's disease
1:10
is, maybe unravel the mystery of why it happens,
1:13
given there seems to be no single cause. That's
1:16
a key point. It's multifactorial. Right. And
1:19
identify who it typically affects, delve into
1:22
how medical professionals diagnose and stage
1:24
its progression using different imaging techniques.
1:26
Which is crucial for treatment. Absolutely. and
1:29
explore the range of treatment options available,
1:32
from non -surgical approaches right through to
1:34
quite complex procedures, and critically understand
1:38
what the long -term outlook and potential future
1:40
holds for someone living with this condition.
1:43
It's really about turning dense medical information
1:45
into clear, actionable understanding for you
1:48
listening. Think of it as your essential guide
1:51
to becoming well -informed about Kinbach's disease,
1:53
extracting the core knowledge and key considerations
1:56
directly from the expert literature we've looked
1:58
at. OK, let's unpack this. Let's start with the
2:00
anatomy and the star of our deep dive. That tiny
2:03
bone, the lunate. The lunate, yes. So this whole
2:06
condition revolves around the lunate bone. Where
2:09
exactly is it located, and why is it such a crucial
2:12
player in the wrist's mechanics? Well, the lunate
2:16
holds a really central and critical position
2:18
in the wrist structure. It sits squarely in the
2:21
middle of the proximal purple row. That's the
2:24
first line of eight small carpal bones in your
2:27
wrist, the ones closest to your forearm. OK.
2:29
Its neighbors are the scaphoid on the thumb side
2:32
and the trichotrum on the pinky side, with the
2:35
pisiform sort of sitting on the trichotrum. More
2:37
importantly, it articulates or connects directly
2:41
with the two long bones of your forearm, the
2:43
radius and the ulna. How does it connect to both?
2:46
It connects specifically through the radial side
2:48
and then via the triangular fibrocartilage complex
2:51
or TFCC on the ulnar side. So it's literally
2:54
right there bridging the forearm and the hand.
2:56
What does that central position mean for its
2:58
function? It means it's absolutely fundamental
3:02
to wrist movement and load bearing. The lunidate
3:05
acts as a key intermediary. You know, facilitating
3:09
the complex range of motion we have in our wrists,
3:11
flexion, bending down, extension, bending back,
3:15
and to some extent, that side -to -side deviation
3:17
as well. And the load -bearing aspect. Yes. Perhaps
3:20
its most significant role, and one that's highly
3:22
relevant to Kinbach's disease, is its function
3:26
in absorbing and transmitting the forces that
3:28
travel through your hand and wrist. particularly
3:30
during activities like gripping, lifting, or
3:33
bearing weight on your hands. Right. That makes
3:35
sense. Our sources actually provide some fascinating
3:37
statistics on this load transmission. Approximately
3:40
35 % of the axial load that goes through your
3:42
wrist during these activities is transmitted
3:44
directly through the articulation between the
3:46
radius and the radial -lunate joint. 25%. And
3:50
another 10 % goes through the TSCC to the ulna.
3:53
So yeah, a significant portion of force, about
3:56
a third, is concentrated right on this one small
3:59
bone. 35 % of the source going through your wrist
4:01
on a bone no bigger than a sugar cube. That sounds
4:05
like an awful lot of stress for such a small
4:07
structure. It is. It's no wonder that if something
4:09
goes wrong here, the consequences can be significant.
4:12
Precisely. And the history of understanding problems
4:15
with this bone goes back further than you might
4:18
think. While there were earlier observations,
4:21
figures like Peste back in the 19th century,
4:24
the specific condition we call Keenbok's disease
4:26
was formally described by Robert Keenbok, an
4:28
Austrian radiologist, in 1910. 1910. So we've
4:32
been piecing together the puzzle of this lunate
4:35
failure for well over a century. We have indeed.
4:38
Who is typically affected by this condition.
4:40
Is there a pattern in the patients diagnosed?
4:43
The data from the sources does show a typical
4:46
demographic profile, although it's not exclusive,
4:47
of course. It predominantly affects males, generally
4:51
within a relatively specific age range, most
4:53
commonly between 20 and 40 years old. Younger
4:56
men, mostly. Yes. And while it's considered a
4:59
rare condition overall, within the category of
5:01
a vascular necrosis affecting the carpal bones,
5:04
it's the second most common type after AVN of
5:08
the scaphoid bone. OK, second only to the scaphoid.
5:11
Correct. Interestingly, the sources also note
5:13
that it's quite rare to see keen box disease
5:15
affecting both wrists at the same time. It's
5:19
usually unilateral, just one side. So younger
5:22
to middle aged men are the most common demographic,
5:25
though certainly not the only ones affected.
5:27
Now, the big question and one the sources emphasize
5:30
is still not fully answered. Why does this happen?
5:34
Given the central role of blood supply loss,
5:36
you'd think there'd be a clear cause. You would,
5:38
wouldn't you? But the sources are clear there
5:40
isn't one single consensus reason. It's described
5:43
as multi -factorial. That's right. The mystery
5:46
of Keenbox is that it seems to arise from a confluence
5:49
of factors rather than a single event or deficiency.
5:53
The sources detail several key proposed mechanisms
5:56
that likely interact to lead to the disease.
5:59
Okay, what are the main contenders? One of the
6:01
most compelling and frequently cited is biomechanical
6:04
imbalance. Specifically, variations in the lengths
6:07
and angles of the bones in the forearm and wrist.
6:11
The most prominent example is ulnar negative
6:13
variance, often called ulna minuses. Okay, let's
6:16
break that down. Ulnar negative variance, what
6:18
does that actually look like in the wrist? Simply
6:20
put, it means the ulna bone that's the forearm
6:23
bone on the pinky side is congenitally shorter
6:25
relative to the radius bone, the one on the thumb
6:27
side. OK, shorter ulna. Because the radius is
6:30
relatively longer. The load that should ideally
6:32
be shared between the radius and the ulna. gets
6:35
disproportionately shifted towards the radial
6:37
side of the wrist. Ah, so the lunate, sitting
6:40
mostly under the radius, ends up taking on an
6:42
even greater share of that load than it normally
6:44
would, more than that 35%. Exactly. That 35 %
6:48
load transmission through the radial -lunate
6:49
joint gets magnified. The sources cite studies
6:52
showing a remarkably high correlation between
6:54
Keenbach's disease and ulnar -negative variants,
6:57
up to 78 % in some patient populations. 78%,
7:01
that's huge. It is. that even a small anatomical
7:06
difference in bone length can have a profound
7:08
biomechanical consequence over time. Another
7:11
related factor mentioned is a decreased radial
7:14
inclination angle, which is the angle formed
7:16
by the end of the radius bone. A lower angle
7:19
here also seems to direct more force onto the
7:22
lunate. It's fascinating how such subtle variations
7:25
can predispose someone to this serious condition.
7:28
What else contributes? Well, repetitive microtrauma
7:31
and compression loading are also strongly implicated.
7:35
While a single traumatic event can sometimes
7:37
play a role, the sources emphasize that cumulative
7:39
stress from repeated wrist movements, perhaps
7:42
hyperextension, flexion, or significant axial
7:45
loading. Like from certain jobs or sports? Precisely.
7:48
Like from certain sports, manual trades, or even
7:50
just repetitive heavy gripping. This can cause
7:53
micro -damage to the lunate. Now, if this micro
7:56
-damage outpaces the bone's ability to repair
7:58
itself, it can compromise the local blood supply.
8:01
So constant low -level stress, not necessarily
8:03
a single big injury, could be part of the problem.
8:06
You mentioned blood supply earlier. That seems
8:08
absolutely fundamental to a vascular necrosis.
8:10
It absolutely is. And the specific anatomy of
8:13
the lunates' blood supply makes it particularly
8:15
vulnerable. It receives blood from a network
8:18
of small arteries that penetrate the bone from
8:20
the dorsal, the back, and volar, the palm. sides
8:23
of the wrist. These form anastomosis connections
8:26
outside the bone. OK. But the crucial point highlighted
8:29
in the sources is that the lunate has relatively
8:32
sparse intraosseous collaterals. Meaning? Meaning
8:36
there aren't many backup blood vessels running
8:38
within the bone itself to provide alternative
8:41
routes for blood flow if one of the main penetrating
8:44
arteries gets compromised. So if a main supply
8:46
line is blocked or damaged, there aren't many
8:49
internal detours to keep the bone alive. That
8:51
sounds like a significant point of vulnerability.
8:53
It really is. And the sources specifically note
8:56
that a lower number of these penetrating arteries,
8:59
especially the vulgar branches coming from the
9:01
palmar radiocarpal arch, is associated with an
9:04
increased risk of developing kin box. Fewer entry
9:06
points, more risk. Exactly. Different patterns
9:10
of arterial supply have even been identified
9:12
described as Y, X, or I patterns. The eye pattern,
9:16
where there are fewer connections and less redundancy,
9:19
is found in a significant proportion of patients,
9:21
around 31%, and is postulated to be the most
9:24
precarious in terms of blood supply. So the eye
9:27
pattern might put those individuals at higher
9:29
risk? Potentially, yes. The source has also mentioned
9:33
the possibility of disruption to venous outflow,
9:37
getting blood out of the bone. If that's impaired,
9:40
it could lead to increased pressure within the
9:42
bone, further compromising blood flow. Ah, so
9:44
it's not just getting blood in, but also getting
9:46
it out. Precisely. Venous outflow is part of
9:49
the puzzle. So the lunid's blood supply is naturally
9:52
a bit precarious, and if you have fewer main
9:54
entry points or struggle to get blood out, it's
9:56
a setup for potential failure. What about the
9:59
bone's own structure or shape? Does that play
10:02
a role? Yes. Lunate morphology is another piece
10:04
of the puzzle. The size and shape of the lunate
10:06
itself matter. Logically, a smaller lunate will
10:09
experience higher stress per unit area under
10:12
the same load. More significantly, perhaps, the
10:14
shape plays a role. Lunates are often described
10:17
as either more triangular, type 1, which lacks
10:20
a medial, articular facet, or more square rectangular,
10:23
type 3, which has that facet. The type I lunate
10:26
is considered a risk factor because it seems
10:28
to have a weaker internal trabecular pattern,
10:31
making it potentially less resilient to stress.
10:33
So, a combination of biomechanical stress from
10:36
potentially misaligned forearm bones, repetitive
10:39
microtrauma, a naturally fragile blood supply
10:42
pattern, and maybe even a smaller or weaker shaped
10:45
lunate bone. It really does sound like multiple
10:48
risk factors converging to overwhelm this small
10:51
bone. It's precisely that sort of perfect storm
10:53
scenario that the sources point towards. And
10:55
while a history of a single significant trauma
10:58
is sometimes reported and can contribute, the
11:00
sources emphasize that in a surprising number
11:02
of cases, there's no clear traumatic event in
11:04
the patient's history. The onset is often more
11:06
gradual, more insidious. And are there any other
11:09
medical conditions that seem to increase the
11:11
risk? Any systemic links? Yes. The sources list
11:14
several systemic conditions that are associated
11:16
with Keenbox disease. These include conditions
11:19
that might affect blood clotting or circulation,
11:22
like sickle cell anemia, or inflammatory conditions
11:25
like gout and lupus. Okay. Cerebral palsy is
11:28
also mentioned, though the mechanism there might
11:30
be related more to abnormal muscle forces affecting
11:33
wrist mechanics. Osteoporosis, a condition causing
11:37
weakened bones, particularly in older women,
11:40
is also noted as a potential factor, though Keenbox
11:42
is generally less common in that demographic
11:44
compared to younger males. So these conditions
11:46
might predispose someone by affecting the health
11:49
of blood vessels or the bone tissue itself. That
11:52
seems to be the thinking, yes. They add another
11:54
layer of potential vulnerability. It's quite
11:56
remarkable how seemingly unrelated systemic health
11:59
issues can connect back to this problem in a
12:01
tiny wrist bone. You touched on it briefly, but
12:04
I've often heard Keenbox mentioned in the context
12:06
of occupational hazards, like using vibrating
12:09
tools. Does the research and the sources strongly
12:12
support that link? That's a common association,
12:14
certainly. And historically, occupational exposure,
12:17
particularly to hand -arm vibration, was strongly
12:19
suspected. However, the sources specifically
12:22
highlight a systematic review which found, perhaps
12:25
surprisingly, only weak evidence to definitively
12:28
link Keenbox disease directly to occupational
12:31
hand -arm vibration exposure. Oh really? Weak
12:34
evidence? Yes. So while the idea of repetitive
12:37
stress contributing is still very valid, the
12:40
specific link to occupational vibration tools
12:42
appears less strongly supported by current reviews
12:45
than the sources than perhaps previously thought.
12:48
This is a key point to note, as it does challenge
12:51
a common assumption. Okay, so to sum up this
12:53
complex etiology, it's rarely one single thing.
12:56
It's more likely a combination of subtle individual
12:58
anatomical variations, the mechanical demands
13:01
placed on the wrist, a predisposed vascular architecture
13:03
of the lunet, and potentially contributing systemic
13:06
health issues. It's a fascinating interplay of
13:09
factors. It truly is a multifactorial puzzle,
13:12
and getting a handle on these potential contributors
13:14
is crucial for diagnosis and deciding on treatment.
13:18
even though the exact cause in any individual
13:20
case can still be difficult to pinpoint definitively.
13:24
And that difficulty brings us neatly to our next
13:26
segment, experiencing this disease and the process
13:29
of figuring out what's actually going on. Diagnosis
13:31
and evaluation, yes. So someone is starting to
13:34
feel pain in their wrist. How does Keenbox typically
13:38
manifest from the patient's perspective? What
13:40
are the common symptoms? Well, the sources describe
13:43
a typical presentation that unfortunately often
13:45
starts quite subtly. The most common initial
13:48
symptom is pain, usually felt on the dorsal or
13:51
back side of the wrist, right over where the
13:53
lunate bone sits. Okay, dorsal wrist pain. Initially,
13:56
this pain might be mild, intermittent, perhaps
13:58
just feeling like a nagging ache after certain
14:00
activities. It's very often dismissed as just
14:03
a sprain or a minor strain, which contributes
14:06
to that delay in diagnosis we mentioned earlier.
14:08
So it's not usually a sudden, acute pain at the
14:10
very beginning, like a fracture might be. Not
14:13
typically, no. It's more often a gradual onset.
14:16
The pain characteristically worsens with activities
14:19
that put stress through the wrist, especially
14:21
those involving wrist extension, bending it backwards,
14:24
or significant axial loading. Like push -ups
14:26
or lifting. Exactly. Things like push -ups, lifting
14:29
heavy objects, or any task requiring strong gripping
14:32
or leaning on the wrist. As the disease progresses
14:35
and the bone degenerates, this activity -related
14:38
discomfort can become more constant and debilitating,
14:41
significantly impacting daily function. What
14:44
else might someone experience? Beyond pain, other
14:47
symptoms tend to emerge. On physical examination,
14:50
a doctor might find localized swelling over the
14:52
lunate area. There's almost always significant
14:55
tenderness when pressing directly over the limate
14:57
bone on the back of the wrist. Sinnovitis, which
15:00
is inflammation of the joint lining, can also
15:02
be present, contributing to the swelling and
15:05
a feeling of stiffness. And what about the wrist
15:08
movement? Does that get affected? Yes, range
15:10
of motion becomes increasingly limited as the
15:13
disease advances. You'll typically see a measurable
15:15
decrease in both wrist flexion, bending down,
15:19
and extension, bending back. Grip strength also
15:22
diminishes, which makes sense given the lunate's
15:25
role in load transmission during gripping. Okay,
15:27
so pain, swelling, tenderness, stiffness, reduced
15:31
grip. And in later stages, as the lunate bone
15:34
begins to collapse and fragment and the overall
15:36
carpal alignment changes, patients might start
15:38
to notice mechanical symptoms, things like clicking,
15:42
popping, or perhaps clunking sensations within
15:44
the wrist during movement. Ah, that sounds like
15:46
things are really starting to degenerate. It's
15:48
often a sign of instability and advancing joint
15:50
degeneration, yes. So it starts deceptively simply.
15:54
but can progress to significant pain, stiffness,
15:58
weakness, and even those mechanical noses. You
16:01
mentioned earlier, though, that symptom severity
16:03
doesn't always line up perfectly with the stage
16:05
seen on imaging. That's a crucial point emphasized
16:08
in the sources and one that makes managing expectations
16:11
well. quite challenging. Yes, you can have someone
16:13
experiencing severe debilitating pain early on,
16:17
even when imaging only shows stage one or perhaps
16:19
stage two changes. Really? Yes. Conversely, some
16:23
individuals with radiographic evidence of more
16:25
advanced stages might report surprisingly manageable
16:28
pain levels for a period of time. This variability
16:31
highlights the complex nature of pain perception
16:34
and the disease's sometimes unpredictable clinical
16:37
presentation. Given the subtle onset and that
16:40
potential symptom stage mismatch, how do doctors
16:43
go about diagnosing Keenbox disease? What's the
16:46
investigative process? Diagnosis is fundamentally
16:48
a clinical and imaging diagnosis. It starts with
16:51
a detailed patient history, understanding when
16:54
the symptoms began, what makes them worse, any
16:56
history of trauma or repetitive activities, and
16:59
reviewing any associated systemic conditions
17:01
we talked about. The detective work. Exactly.
17:04
Followed by a thorough physical examination to
17:06
assess that tenderness, swelling, range of motion,
17:09
and grip strength. But imaging is absolutely
17:13
essential to confirm the diagnosis and, importantly,
17:16
to stage the disease. Right, staging is key.
17:18
How does the imaging usually proceed? The imaging
17:21
process often follows a progression. Standard
17:24
radiography x -rays are usually the first step.
17:27
However, and this is a critical limitation, x
17:30
-rays are often completely normal in the very
17:32
early stages stage I. So a clear x -ray doesn't
17:34
mean you're in the clear. Not at all, especially
17:37
early on. The classic radiographic signs only
17:39
appear later. What doctors look for in x -rays
17:42
as the disease progresses are things like increased
17:45
density of the lunate bone, sclerosis, which
17:48
makes it appear whiter on the image due to hardening
17:50
and attempted repair. Also cystic changes, small
17:53
fluid -filled areas within the bone, obvious
17:55
collapse or fragmentation of the lunate, changes
17:57
in the alignment of the other carpal bones, what
17:59
we call carpal collapse, and signs of secondary
18:02
arthritis or arthrosis in the joints around the
18:05
lunate. Do they need special x -ray views? Yes.
18:07
X -rays are also needed in specific views, like
18:10
a zero -rotation PA view, to accurately measure
18:13
that ulnar variance we discussed earlier, as
18:16
well as the radial inclination. They can also
18:18
pick up coronal fractures within the lunate in
18:20
later stages. So a normal X -ray definitely doesn't
18:23
rule it out, especially early on. What's the
18:26
next step in imaging, then, if the X -ray is
18:29
normal but kin box is still suspected? Because
18:32
X -rays are often normal initially, MRI magnetic
18:35
resonance imaging, is considered the most sensitive
18:38
diagnostic tool, particularly for detecting early
18:41
-stage disease that isn't visible on x -rays,
18:43
what we call radiographically occult cases. An
18:46
MRI can directly visualize the changes in the
18:49
bone marrow associated with loss of blood supply.
18:52
What specifically does an MRI show in early -kin
18:54
box? What's the giveaway? The hallmark finding
18:57
on MRI, especially on T1 -weighted images, is
19:00
a diffuse decrease in the signal intensity of
19:02
the lunate bone marrow. This darkening of the
19:04
bone marrow is indicative of disrupted blood
19:06
flow and fat necrosis within the bone. Right,
19:09
so the MRI sees the blood supply problem directly.
19:12
Essentially, yes. As the disease progresses,
19:15
the signal characteristics on other types of
19:17
MRI sequences, like T2 -weighted or S -stora
19:20
images, can change, reflecting things like edema,
19:23
swelling, fragmentation, or those cystic changes.
19:26
MRI is also invaluable for assessing the health
19:29
of the surrounding cartilage and ligaments, helping
19:31
to identify complications like scaffolding, ligament
19:34
injury, or maybe ulnar impassioned syndrome,
19:37
which can sometimes mimic or coexist with Keenbox.
19:40
So MRI is key for catching it early by assessing
19:42
blood supply and soft tissues. While x -rays
19:45
are more useful for visualizing structural changes
19:47
and overall alignment in later stages, what about
19:49
CT scans? Where do they fit in? CTE computer
19:52
tomography is particularly useful once structural
19:54
damage is suspected or confirmed on x -ray, especially
19:57
when surgical planning is being considered. CTE
19:59
provides exquisite bony detail. Better than x
20:02
-ray for bone detail. Oh, yes. It's more sensitive
20:04
than x -ray for detecting subtle subchondral
20:06
fractures. That's fractures just below the cartilage
20:09
surface, any coronal lunate fractures, the precise
20:12
degree of fragmentation of the lunate, and the
20:15
extent of carpal instability patterns. The source
20:18
has mentioned that patients are actually frequently
20:20
restaged after getting a CT scan because it often
20:23
reveals more extensive bony damage or instability
20:26
than was apparent on the initial x -rays. Okay,
20:28
so x -ray for general overview and alignment,
20:31
MRI for early blood supply issues and soft tissue,
20:34
and CT for detailed bone structure and fragmentation,
20:38
especially important for surgery planning. Was
20:40
there an older imaging technique used? Something
20:42
else mentioned. Yes, nuclear scintigraphy. or
20:45
a bone scan, was used historically as an adjunct
20:47
tool, particularly for suspected early cases
20:50
when MRI wasn't perhaps as widely available or
20:53
sophisticated as it is today. It could show increased
20:55
uptake in areas of bone injury or decreased uptake
20:58
in areas of significant necrosis. But less common
21:00
now. Much less common now. Given the superior
21:04
sensitivity and the detailed anatomical information
21:06
provided by MRI, bone scans have largely fallen
21:09
out of favor for diagnosing Keenbox disease specifically.
21:13
It sounds like Piecing together the diagnosis,
21:16
especially in those crucial early stages, really
21:19
requires a high index of suspicion and using
21:22
the right imaging tools at the right time. It's
21:25
easy to see how delays could happen. They are,
21:27
unfortunately, very common. As the sources note,
21:30
the challenge of early diagnosis is significant
21:33
precisely because those initial symptoms are
21:35
vague and x -rays are often normal, necessitating
21:38
the use of MRI. Patients frequently experience
21:41
diagnostic delays, sometimes for months or even
21:43
years, which sadly allows the disease to progress
21:46
further before any intervention. Once the diagnosis
21:48
is made, how do doctors classify how severe the
21:51
disease is? This is where staging comes in, right?
21:53
You mentioned that's crucial. Correct. Staging
21:55
is absolutely fundamental. It provides a framework
21:58
for understanding the disease's progression,
21:59
and most importantly, it guides treatment decisions.
22:03
The most widely used system is morphologic staging
22:05
based on the Lichtman classification. Lichtman
22:08
classification. OK. This classification relies
22:11
primarily on radiographic findings, mainly x
22:14
-rays, often refined by CT. And it's known for
22:17
its relatively low interobserver variability,
22:20
meaning different clinicians tend to agree on
22:22
the stage when looking at the images. What are
22:24
the stages? The Lickman classification breaks
22:26
down the progression of the lunates' deterioration
22:29
and its effect on the surrounding wrist structure.
22:32
Stage one. This is the earliest stage. Crucially,
22:36
standard x -rays appear normal. The disease is
22:39
only detectable at this point on MRI, which shows
22:41
those characteristic signal changes indicating
22:43
compromised blood supply, ischemia, and edema.
22:46
So MRI positive, x -ray negative. Exactly. Stage
22:49
two. Now, changes become visible on x -ray. The
22:53
lunate shows increased density, or sclerosis.
22:55
It looks whiter and more otake than normal bone.
22:58
The overall shape and size of the lunand are
23:00
still preserved at this stage, but subtle fraction
23:02
lines might start to appear within the bone.
23:04
Okay, density changes on x -ray? Yes. Stage 3.
23:07
This is defined by collapse of the lunate's articular
23:10
surface that smooths surface that connects with
23:12
other bones. It's subdivided further. Stage 3
23:14
-3. The lunate has collapsed, but the overall
23:17
alignment and height of the carpal bones in the
23:19
wrist are still preserved. No major structural
23:22
shift yet. Stage 3 -4. The lunate collapse is
23:25
more significant, and it starts leading to changes
23:27
in carpal alignment. The scaphoid bone typically
23:30
starts to flex forward, and there is a measurable
23:32
loss of overall carpal height. This often results
23:35
in a specific pattern of instability called the
23:37
Dissy deformity, dorsal -interfilated segmental
23:41
instability. Stage I. This is similar to I .B.
23:45
with collapse and loss of carpal height, but
23:47
specifically includes an associated coronal fracture
23:49
of the fractal line visible on imaging running
23:52
vertically through the bone. So stage III is
23:54
all about collapse and its effect on alignment.
23:56
Precisely. Then finally, stage four. This is
23:59
the end stage. It includes the significant collapse
24:03
and carpal height loss seen in stage IB, plus
24:05
the development of secondary degenerative arthrosis,
24:09
basically arthritis in the radiocarpal joint
24:11
between the radius and the proximal carpal row,
24:14
and or the mid -carpal joint between the two
24:16
rows of carpal bones. So the lignum classification
24:19
is essentially mapping the physical destruction
24:21
of the bone and the cascade of effects on the
24:24
rest of the wrist structure. Is there another
24:26
way to stage the disease? You mentioned imaging
24:29
blood flow earlier. Yes, there's also functional
24:31
staging. This is typically assessed using contrast
24:34
-enhanced MRI. While morphologic staging tells
24:37
you about the structural damage, functional staging
24:39
tells you about the actual blood flow and the
24:41
extent of viable living bone tissue within the
24:43
lunet. And that's important for treatment planning.
24:45
Very much so. It's particularly valuable for
24:48
guiding treatment decisions regarding revascularization
24:50
procedures, which really only have a good chance
24:52
of working if there's enough viable bone remaining.
24:55
typically considered useful in stages first,
24:58
two, and perhaps early stage theia. How does
25:01
functional staging work with the contrast dye?
25:03
Functional staging, based on how the lunate enhances
25:06
after injecting contrast dye, looks something
25:08
like this. Stage one. After the contrast injection,
25:12
the lunate shows intense homogenous enhancement.
25:16
This indicates good blood flow and viable bone,
25:19
corresponding usually to morphologic stage I,
25:21
where there's ischemia and edema. but not yet
25:24
established necrosis. Stage 2. The enhancement
25:27
is patchy and inhomogeneous. This suggests partial
25:31
necrosis has occurred, but there are still areas
25:33
of viable bone, often in the distal part of the
25:35
lunate. This typically corresponds to morphologic
25:38
stage 2, stage 3. There is a complete absence
25:41
of contrast enhancement within the lunate. This
25:44
indicates full -blown, complete avascular necrosis
25:47
with no significant blood flow remaining, usually
25:49
seen in morphologic stages 3a and beyond. So
25:53
doctors use both morphologic staging to understand
25:55
the structural damage and functional staging
25:57
to understand the biological viability of the
25:59
bone itself. That combined picture must be absolutely
26:02
essential for deciding on the best course of
26:04
action for each patient. It's precisely that
26:07
comprehensive assessment that allows for tailoring
26:09
treatment. Keenvox is definitely not a one -size
26:12
-fits -all condition when it comes to management.
26:14
Which leads us perfectly into the final piece
26:17
of this puzzle. Navigating the treatment options
26:19
and what the road ahead looks like for someone
26:21
diagnosed with Keenbox disease. Yes, the management
26:24
strategies. So we've mapped the disease's progression
26:27
through staging. What are the main goals when
26:29
doctors and patients discuss treatment for Keenbox?
26:32
What are they trying to achieve? The fundamental
26:34
goals of treatment, as outlined pretty consistently
26:37
in the sources, are threefold. Alleviating pain,
26:41
preserving as much wrist motion as possible,
26:43
and maintaining or restoring grip strength. Pain,
26:46
motion, strength. Makes sense. However, the strategy
26:50
for achieving these goals is highly dependent
26:52
on several factors. The specific stage of the
26:55
disease, of course, based on Lickman and functional
26:57
staging, the patient's symptoms and their functional
26:59
demands, what they need their wrist to do, and
27:02
crucially, the presence of those contributing
27:04
biomechanical factors like ulnar negative variants.
27:08
So treatment is very much tailored to the individual
27:10
and their specific wrist anatomy and disease
27:13
state. Absolutely. highly personalized. Let's
27:16
start with the less invasive options. What happens
27:18
in the earlier stages or perhaps for patients
27:21
with milder symptoms? For early stage disease,
27:25
typically stage one and potentially some cases
27:27
of stage two where there's incomplete necrosis,
27:30
non -operative approaches are usually considered
27:32
initially. The most common method is immobilization
27:36
of the wrist. usually with a cast or rigid splint.
27:39
Immobilization. How long might someone need to
27:41
be immobilized for? Does it vary? That duration
27:44
varies quite significantly, as the sources highlight.
27:47
While some studies report average immobilization
27:49
periods around, say, 8 .6 months, historical
27:52
accounts in the literature mention extremes of
27:55
up to 20 years of casting, though that would
27:57
be highly unusual in modern practice. Twenty
27:59
years? Goodness. Yes. Immobilization is often
28:02
the preferred initial treatment for specific
28:05
demographics, such as adolescents, where bone
28:07
healing potential might be different, and perhaps
28:09
older adults over the age of 70, where surgical
28:12
risks might be higher. Does embolization often
28:15
lead to healing in adults? Does it fix the problem?
28:18
Unfortunately, the sources are quite clear on
28:20
this. In adults, spontaneous revascularization
28:23
and healing of the lunate with non -operative
28:26
treatment alone is rare. The disease is likely
28:28
to progress to later stages despite prolonged
28:31
casting in most adult cases. So it doesn't really
28:33
stop it? Not usually in adults, no. A majority
28:36
of adult patients initially treated nonoperatively
28:39
will eventually require surgical intervention
28:42
if they remain symptomatic, or the disease clearly
28:44
advances on imaging. So, while immobilization
28:48
might provide temporary pain relief by resting
28:50
the wrist, it typically doesn't alter the underlying
28:53
progressive course of the disease in adults.
28:55
Okay, so it's more about symptom control, maybe?
28:57
In many cases, yes. Other non -operative measures
29:00
include pain management with simple analgesics
29:03
like paracetamol or NSAIDs to reduce pain and
29:06
swelling, and sometimes just observation combined
29:09
with activity modification, advising patients
29:11
to avoid activities that aggravate their pain.
29:15
Again, while these can help manage symptoms,
29:17
the sources indicate that most adult patients
29:19
treated solely with observation or activity modification
29:22
will eventually need more definitive management
29:25
due to symptom progression or functional decline.
29:27
Okay, so non -operative is mainly for symptom
29:30
management, specific patient groups, or maybe
29:32
as a holding measure. More often than not, it
29:35
seems surgery becomes necessary. What are the
29:37
main categories of surgical intervention, then?
29:40
Operative treatment strategies broadly fall into
29:42
two main categories, or sometimes a combination
29:44
of both. One aims to restore blood supply to
29:47
the lunate. These are the revascularization procedures.
29:50
The other aims to reduce the mechanical load
29:52
or stress on the lunate and stabilize the wrist.
29:55
These are often called joint leveling or salvage
29:57
procedures. Okay, let's talk about relieving
30:00
the pressure first, the joint leveling ones.
30:02
Right, these are the joint leveling procedures
30:03
designed to offload the lunate. They're particularly
30:07
relevant when that contributing factor of ulnar
30:09
negative variance is present, but variations
30:12
are also used for neutral or even positive variance
30:14
situations. How does he do that? The most common
30:17
procedure for significant ulna minus is a radial
30:20
shortening osteotomy. This involves surgically
30:23
removing a small segment of the radius bone to
30:25
make it shorter, thus equalizing the lengths
30:27
of the radius and ulna at the wrist joint and
30:30
shifting load away from the lunate onto the ulnar
30:33
side. Does she shorten the longer bone? Exactly.
30:36
Alternatively, the less common and ulnar lengthening
30:39
osteotomy can be performed to achieve the same
30:42
relative length. For risks with neutral or positive
30:45
ulnar variants, where the ulna is already the
30:47
same length or longer, a radial wedge osteotomy
30:50
can be used. This involves cutting a wedge shape
30:53
out of the radius to alter the angle of the radial
30:55
joint surface, again aiming to shift load off
30:57
the lunate. So you're literally changing the
31:00
bones alignment to create a better biomechanical
31:02
environment for the struggling lunate. Do these
31:05
procedures make a significant difference in how
31:07
much stress the lunette actually bears? They
31:09
can have a really dramatic effect. The sources
31:12
cite some compelling data. A radial shortening
31:15
or ulnar lengthening of just four millimeters
31:17
can result in a substantial 45 percent decrease
31:21
in the contact stress on the radial lunette joint.
31:24
45%. That's huge. It is. This reduction in load
31:27
provides a much better environment for potential
31:29
healing, or at least slowing down progression,
31:32
particularly useful in the earlier stages, typically
31:34
stages 2 and higher IA. That's a massive reduction
31:38
from a relatively small adjustment. Okay, what
31:41
about the other approach, trying to bring blood
31:43
flow back to the lunate, the revascularization
31:45
you mentioned? Yes, these are the revascularization
31:47
procedures. They are most appropriate in earlier
31:50
stages, stages 5 and potentially early IDREA,
31:53
when there is still a significant amount of viable
31:54
bone remaining, which as we said can be assessed
31:57
with that functional contrast MRI. The primary
32:00
technique here is using vascularized bone grafts,
32:03
VBG. Vascularized bone graft? What does that
32:06
actually involve? Sounds complex. It is a complex
32:10
microsurgical technique. It involves taking a
32:12
bicep bone from another location in the body.
32:15
Common donor sites include the distal radius
32:17
itself, near the wrist, the iliac crest, which
32:20
is part of the hip bone, or even using small
32:22
bone pieces supplied by branches of the dorsal
32:25
metacarpal arteries in the hand. Like the 4 plus
32:27
5. Exactly. The 4 plus 5 extensor compartment
32:30
artery pedicle is mentioned as being favored
32:33
sometimes for its good mobility. Crucially, this
32:36
bone piece is transferred with its attached blood
32:38
vessels still intact and functioning. These kidney
32:41
vessels are then surgically connected and astimosed
32:44
to blood vessels near the lunate, effectively
32:46
aiming to give the lunate a new, living blood
32:49
supply and also some structural support. Bringing
32:51
in reinforcements with their own supply lines?
32:53
That's a good way to think of it. Another revascularization
32:56
technique mentioned, often used in earlier stages,
32:59
I5CDSE, is distal radius core decompression.
33:02
This involves drilling small holes into the distal
33:05
radius near the lunate attachment. Why drill
33:07
holes? Well, the thinking is it might potentially
33:10
reduce the pressure within the bone, the intraosseous
33:13
pressure, and perhaps stimulate a local healing
33:15
response and encourage the in -growth of new
33:18
blood vessels from the radius towards the lunate.
33:21
Sometimes, temporary pinning across the wrist
33:23
or external fixation is used alongside revascularization
33:27
to temporarily hold the wrist bones in a position
33:31
that minimizes stress on the lunate, allowing
33:33
the graft or decompression effect to establish.
33:35
How successful are these? VBGs are certainly
33:38
promising, especially in younger patients with
33:40
early stage disease. However, the sources do
33:43
note that long -term outcomes can be variable.
33:45
And success really depends on the graft properly
33:49
integrating and that new blood supply being sufficient
33:51
and sustained. Okay, so leveling the bones to
33:54
reduce stress or bringing in new blood supply
33:56
with bone grafts. What happens when the lunate
33:58
is already significantly collapsed or the wrist
34:01
has become unstable or arthritic those later
34:03
stages, IIB and IV? In these more advanced stages,
34:06
the focus often shifts away from trying to save
34:08
the lunated self towards salvage procedures.
34:11
These aim to eliminate pain and stabilize the
34:14
wrist, acknowledging that restoring full, normal
34:17
motion may not be achievable. One category here
34:20
is partial wrist fusions, arthrodesis. Partial
34:23
fusion. What does that mean exactly? Fusing only
34:26
some bones. Precisely. It means surgically fusing
34:29
specific carpal bones together while leaving
34:31
others free to move. The goal is usually to create
34:34
stability. offload the damaged lunate area, or
34:37
correct instability patterns like that dizzy
34:39
deformity we mentioned, while hopefully preserving
34:41
movement in the unfused portions of the wrist.
34:44
Which bones might they fuse? Common partial fusions
34:46
include STT fusion, which fuses the scaphoid,
34:49
trapezium, and trapezoid bones together, or perhaps
34:52
scaphocapitate fusion, or caponohamid fusion.
34:55
These are typically considered in stages 2, LEIA,
34:58
and IIB. What's the outcome of a partial fusion?
35:01
Well, a partial fusion can certainly reduce pain
35:03
and provide stability, but it necessarily limits
35:06
the overall range of motion compared to a healthy
35:08
wrist because the fused bones no longer move
35:11
independently. The choice of which bones to fuse
35:14
depends very much on the exact pattern of collapse
35:17
and instability present. The sources do mention
35:20
differing opinions and evidence regarding which
35:22
specific partial fusion is optimal for, say,
35:25
stage IB, with some studies suggesting STT fusion
35:28
might be preferred over other options like proximal
35:31
row carbectomy in certain cases. OK, so partial
35:34
fusion limits motion but helps pain and stability.
35:38
What if the lunate is severely fragmented, collapsed,
35:41
or there's already significant arthritis involving
35:44
that? whole first row of carpal bones. That's
35:46
where proximal row carpectomy, PRC, becomes a
35:48
very viable option. This involves surgically
35:50
removing the entire proximal row of carpal bones,
35:53
the scaphoid, the lunate, and the trichotrum.
35:55
Removing all three. Yes. This procedure is typically
35:58
indicated for stages I, IV, and IV, especially
36:00
when the lunate is really beyond repair or the
36:03
joints involving that proximal row are severely
36:04
affected by arthritis. Removing three bones from
36:07
the wrist sounds quite drastic. What's the outcome
36:10
like after a PRC? While it sounds significant,
36:13
PRC is actually a well -established procedure
36:15
that can be very effective at relieving pain.
36:18
It sacrifices that first row, but it preserves
36:21
a surprising amount of wrist motion, usually
36:23
around 50 -60 % of the normal range, by allowing
36:27
the distal carpal row, the second row of bones,
36:30
to articulate directly with the end of the radius
36:32
bone. So you still get decent movement. You get
36:34
functional movement, yes, and often good grip
36:37
strength returns, too. This makes it a favorite
36:40
option for individuals who need reasonable pain
36:42
relief and still require a degree of wrist flexibility,
36:45
perhaps for certain professions or activities
36:47
like playing musical instruments. And if the
36:49
arthritis is even more extensive, involving the
36:51
radius itself or the entire wrist joint in stage
36:54
4. When there is diffuse, severe arthritis throughout
36:57
the radiocarpal and mid -carpal joints, often
37:00
resulting from the end -stage collapse of Keenbach's
37:03
disease, then a total wrist fusion orthodesis
37:06
might be necessary. This is considered a definitive
37:09
salvage procedure. Total fusion, what does that
37:11
involve? Total wrist fusion involves surgically
37:14
joining all the carpal bones together and then
37:16
fusing this block of bones to the end of the
37:19
radius bone in the forearm. So everything is
37:21
locked solid? Essentially, yes. This procedure
37:24
is extremely effective at eliminating pain because
37:27
all the painful arthritic joints are immobilized.
37:30
However, the trade -off is significant. You lose
37:33
all notion at the wrist joint itself. No flexion,
37:37
extension, or side -to -side deviation is possible.
37:40
The hand is essentially fixed in a functional
37:42
position relative to the forearm. Right, so you
37:45
trade all wrist movement for complete pain relief
37:47
and maximum stability. Who is that typically
37:50
recommended for? Total wrist fusion is often
37:53
recommended for individuals in stage 3 who require
37:56
maximal strength and stability over flexibility,
37:59
perhaps those performing heavy manual labor.
38:01
It's important to note, though, that while you
38:03
lose wrist motion, you retain full forearm rotation,
38:07
turning your palm up and down, pronation and
38:09
supination, which is crucial for many daily tasks.
38:12
What about just taking the lunate out? Is that
38:14
ever done? A more traditional and perhaps less
38:17
commonly performed procedure now for advanced
38:19
stages is simple lunate excision. just removing
38:22
the lunate bone. However, this method on its
38:25
own is associated with a high risk of subsequent
38:28
carpal collapse and instability because of the
38:31
void it leaves behind. Right, things could just
38:33
fall into the gap. Exactly. So sometimes it's
38:36
combined with interposition techniques. For example,
38:39
using a harvested tendon, like the pulmaris longus
38:42
tendon from the forearm, fashioned into a ball
38:45
to try and fill the space and maintain some carpal
38:47
height and stability. That's known as tendon
38:50
ball arthroplasty. It aims to mitigate some of
38:52
the complications of just removing the bone.
38:55
Are there options for replacing the joint like
38:57
a prosthetic wrist? Yes. Total wrist arthroplasty
39:00
using an artificial joint replacement is also
39:02
an option for stage 4 disease, similar in concept
39:05
to hip or knee replacements. It aims to preserve
39:08
more motion than a total fusion while still relieving
39:11
pain. But how reliable are they? Well, the sources
39:13
indicate that the long -term results and durability
39:16
of total wrist arthroplasty are not as well established
39:19
or predictable. compared to total wrist fusion,
39:22
particularly if the wrist is subjected to heavy
39:24
loads. It's typically considered more for patients
39:27
with lower functional demands or perhaps those
39:30
who absolutely cannot tolerate the stiffness
39:32
of the fusion, maybe due to bilateral issues.
39:35
Any other techniques worth mentioning? The sources
39:37
also briefly mention a couple of other techniques
39:39
used in specific circumstances. Temporary scaphotripeziotropazoidal
39:43
STT pinning can sometimes be used in adolescents
39:46
with progressive pain to stabilize the scaphoid
39:50
and unload the lunate while they're still growing.
39:53
And a capitate -shortening osteotomy, sometimes
39:56
combined with a capital hamit fusion known as
39:57
the Omquist procedure, is another approach designed
40:00
to decompress the lunate, particularly in cases
40:03
with neutral or positive ulnar variants. Does
40:05
shortening the capitate help the lunate? It can.
40:08
The sources give interesting data here too. Capitate
40:11
shortening combined with Capito -Hammett fusion
40:14
can decrease radiolunate stress significantly
40:17
by about 66 percent. However, it does transfer
40:20
load elsewhere, increasing the stress on the
40:22
radioscapoid joint by around 26 percent, which
40:25
could potentially increase the risk of future
40:27
osteoarthritis developing there. So there are
40:30
always trade -offs. It's clear there are so many
40:32
surgical paths, each with its own specific goals,
40:35
indications based on stage and anatomy and very
40:38
distinct trade -offs in terms of pain relief
40:40
versus motion versus stability. Choosing the
40:43
right approach must be a really complex decision
40:45
for both the patient and the surgical team. It
40:47
absolutely is. It requires very careful consideration
40:50
of the disease state, the patient's individual
40:53
functional needs and expectations, and a thorough
40:56
discussion of the potential risks, benefits,
40:58
and long -term consequences of each procedure.
41:00
After any of these treatments, whether it's non
41:03
-operative immobilization or one of the surgical
41:05
procedures, what does the recovery process typically
41:07
involve? It can't be quick. No, recovery is a
41:10
critical and often lengthy phase that definitely
41:13
demands patients and dedicated rehabilitation.
41:16
Following a period of immobilization in a cast
41:19
or splint, which as we said can range from several
41:22
weeks to several months, depending on the procedure
41:24
or the non -operative plan, patients then transition
41:28
into rehabilitation. And that involves therapy?
41:31
Yes. The core of recovery involves working closely
41:33
with a specialized physical therapist, or occupational
41:37
therapist, often referred to as a hand therapist.
41:40
Their role is absolutely crucial in guiding the
41:42
patient through a structured program designed
41:44
to regain function. What does that structured
41:47
rehab program typically look like? What are the
41:50
stages? It's typically staged, yes. The initial
41:52
focus is usually on managing any post -treatment
41:55
pain and swelling, and then restore a basic,
41:57
gentle range of motion to prevent stiffness setting
41:59
in. As healing progresses, the program advances
42:03
to include strengthening exercises to rebuild
42:05
muscle power in the forearm and hand, including
42:08
grip strength, which is often significantly weakened
42:10
by the disease and the period of inactivity.
42:13
Finally, it moves towards improving fine motor
42:15
control and dexterity through specific exercises,
42:19
helping the patient regain the ability to perform
42:21
more complex tasks needed for daily living or
42:24
work. Hand therapists also provide essential
42:26
guidance on activity modification and ergonomic
42:29
strategies to help protect the wrist from excessive
42:31
load or stress in the future, trying to prevent
42:34
recurrence or further issues. How important is
42:37
that rehab? It's vital for patients to understand
42:40
that while rehabilitation is essential for maximizing
42:43
their functional outcome, regaining as much strength
42:45
and motion as possible within the limitations
42:47
imposed by the disease or the chosen treatment,
42:50
it doesn't cure the underlying disease process
42:52
itself. The goal of rehab is really to help the
42:55
patient adapt to their post -treatment risk mechanics
42:58
and maximize their ability to use their hand
43:00
as effectively as possible. Given the unpredictable
43:03
nature of Keenbox that we've discussed and the
43:05
range of interventions, what does the long -term
43:08
prognosis look like for someone diagnosed with
43:10
this condition? What does the future hold? Well,
43:13
the sources highlight a somewhat sobering reality.
43:15
Keenbox disease, if left completely untreated,
43:18
is considered invariably progressive. Without
43:21
intervention, the loss of blood supply inevitably
43:24
leads to bone death, fragmentation, collapse,
43:27
and ultimately significant degenerative arthritis
43:29
throughout the wrist. This progression can often
43:32
lead to severe joint destruction and considerable
43:34
loss of function within, say, three to five years
43:37
of symptom onset in many cases. That sounds quite
43:40
serious if it's just left. It is. It's ignored.
43:43
However, and this is the unpredictable aspect
43:45
we keep coming back to, the rate and extent of
43:48
that progression can vary significantly between
43:50
individuals. As the sources note, not every case
43:53
marches predictably through all four stages from
43:55
I to biv. So it's not always a straight line.
43:58
Not always. Some individuals, particularly those
44:01
diagnosed in earlier stages or perhaps with less
44:03
severe underlying risk factors, might experience
44:06
much slower progression or have relatively mild
44:08
symptoms for a longer period, despite radiographic
44:11
changes being visible. And in very rare instances,
44:14
spontaneous improvement or even cessation of
44:17
progression has been reported, though this is
44:19
definitely uncommon, especially in adults. You
44:21
can't rely on that happening. So it's progressive
44:24
generally, but the path isn't set in stone for
44:27
everyone. What factors do influence the prognosis?
44:30
What makes it more likely to be worse? Several
44:33
factors are associated with a less favorable
44:35
prognosis and a higher likelihood of faster progression
44:37
or worse outcomes. The functional stage we discussed
44:40
is key. the greater the extent of viable bones
44:43
seen on functional MRI. Generally, the better
44:46
the potential for success with revascularization
44:49
and perhaps a more favorable outlook overall.
44:51
Makes sense. The degree of negative ulnar variance
44:54
is also strongly correlated. The more ulna minus
44:56
the patient has, the more severe the biomechanical
44:59
stress and the more likely the disease is to
45:01
progress to advanced stages. Age at diagnosis
45:04
is also a factor. Patients diagnosed at an older
45:07
age are more likely to already have more advanced
45:10
stage disease when they present, and may experience
45:13
more rapid progression subsequently. And treatment,
45:16
does that change the prognosis? While treatment
45:18
can significantly improve pain and function,
45:21
the sources acknowledge that outcomes can still
45:23
vary, often categorized in studies as excellent,
45:27
good, fair, or poor. Treatment aims to manage
45:30
symptoms, improve function, and potentially slow
45:33
down the progression, even if the imaging findings
45:35
in later stages still show considerable structural
45:38
damage has occurred. Are there long -term problems
45:40
even after treatment? Unfortunately, yes. Even
45:44
after successful initial treatment, there are
45:46
potential long -term complications to be aware
45:48
of. These can include persistent or recurrent
45:51
pain, stiffness, and residual limitations in
45:54
motion or strength. Specific complications related
45:57
to the altered wrist mechanics or the surgical
46:00
interventions themselves can include things like
46:02
scapholunate dissociation, that's instability
46:05
developing between the scaphoid and the lunates
46:07
remaining portions or its neighbors. Also, secondary
46:11
degenerative arthrosis, or arthritis, developing
46:14
over time in joints that now take on increased
46:16
load because of the surgery, like the radioscapoid
46:19
joint after a capitate shortening or certain
46:21
partial fusions. And malignment of other carpal
46:23
bones, like the trichotrum, can occur. That increased
46:26
stress on the radial side of the wrist post -treatment
46:29
is a persistent risk factor for developing future
46:31
osteoarthritis. And given the progressive nature
46:34
and these potential complications, is it common
46:37
for someone with Kinbox to require more than
46:39
one procedure over their lifetime? Yes, that
46:42
is a distinct possibility, particularly perhaps
46:45
in younger patients or those with more aggressive
46:47
disease patterns or who develop significant complications.
46:51
The sources acknowledge that Keenbox disease
46:54
can really be a lifelong condition requiring
46:57
ongoing management, and some patients may unfortunately
47:00
need multiple surgical procedures over time as
47:03
the disease progresses or complications arise
47:05
from previous interventions. It truly sounds
47:08
like a condition that requires a comprehensive,
47:11
long -term approach involving very careful decision
47:14
making every step of the way and relying heavily
47:17
on an experienced healthcare team. Absolutely.
47:20
The sources really emphasize the value of an
47:22
interprofessional team approach involving hand
47:25
surgeons, radiologists, and specialist hand therapists
47:27
all working together for optimal diagnosis, planning,
47:31
and management throughout the patient's journey
47:32
with this condition. So we've taken a deep dive
47:35
today into Keenbok's disease, exploring that
47:38
delicate lunete bone, the complex interplay of
47:40
factors from subtle anatomical variations to
47:43
vascular patterns and repetitive stress that
47:45
contribute to its mysterious failure. We have.
47:48
And we've seen how challenging diagnosis can
47:50
be, often mimicking simpler issues initially,
47:53
and how advanced imaging like MRI and CT is absolutely
47:57
essential to truly see what's happening inside
48:00
the bone. and to stage the disease accurately
48:03
using classifications like Lickman. And we've
48:06
mapped out the wide spectrum of treatment options,
48:08
haven't we? Ranging from fairly limited non -operative
48:10
measures to quite complex surgical procedures
48:13
aimed at leveling bones, revascularizing the
48:15
lunet in early stages, or performing salvage
48:18
procedures like partial or total fusions or proximal
48:21
rocarpectomy in later stages, each, as we've
48:24
stressed, with its own benefits and inherent
48:26
trade -offs. And we've discussed the long view
48:28
that while it's invariably progressive if left
48:30
untreated, the disease course itself is unpredictable.
48:33
And even with timely interventions and dedicated
48:36
rehabilitation, it can lead to long -term complications
48:39
and potentially require multiple procedures,
48:42
making it a condition requiring ongoing care
48:44
and adaptation from the patient. If you found
48:47
this discussion helpful, perhaps consider sharing
48:49
it with colleagues who might also benefit. What
48:51
stands out to you most about the complexity of
48:53
Keenbox disease? Especially considering those
48:56
really difficult trade -offs, patients and doctors
48:58
must weigh balancing pain relief against preserving
49:01
precious wrist motion, or accepting the risks
49:04
and limitations of potentially multiple interventions
49:06
over a lifetime. It's a condition that really
49:09
highlights the intricate mechanics of the human
49:11
body and the profound challenges of intervening
49:14
when a fundamental supply line to a critical
49:16
structure fails, isn't it? It really does. It
49:18
underscores the importance of early diagnosis,
49:21
tailored treatment, and realistic expectations.
49:23
A fascinating and challenging condition.