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Terrible Triad Elbow Injuries · Deep Dive Ortho — Orthopaedic Surgery, AI & Digital Health Podcast.

0:00
Did you know that a seemingly simple fall onto
0:02
an outstretched arm, a common everyday accident,
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can unleash one of the most devastating and complex
0:09
patterns of orthopedic injury? It really can.
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One so challenging to manage that it was historically
0:15
and perhaps justifiably labeled the terrible
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triad. That's the one. Today we ask, are these
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injuries still as formidable? And how has our
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understanding and treatment evolved to tackle
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this specific kind of chaos in the elbow joint?
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Welcome to the deep dive where we transform stacks
0:33
of information into clear actionable insights.
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I'm your host and in this deep dive we're tackling
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that historically ominous terrible triad of the
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elbow. a very significant injury. This is a dive
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shaped specifically by the collection of articles
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and research you, our dedicated listeners, shared
0:49
with us. To help navigate the intricate anatomy,
0:52
complex mechanics and challenging treatment pathways
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detailed in these sources, I'm thrilled to be
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joined by an expert with a profound ability to
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synthesize dense medical literature into accessible,
1:02
practical understanding. It's a privilege to
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have you with us today. Thank you. It's a pleasure
1:07
to be here. These injuries are certainly a significant
1:10
challenge in orthopedics, and the sources you've
1:13
provided offer a really comprehensive look at
1:16
where we stand in managing them today. And that
1:19
understanding is precisely our mission. Because,
1:22
as the sources make clear, this isn't just a
1:24
collection of random broken bones. No, not at
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all. It's a specific, predictable pattern of
1:29
failure in a joint built for both stability and
1:32
complex motion. Exactly. A delicate balance easily
1:35
disrupted. So let's jump straight into the fundamental
1:38
questions setting the stage for our deep dive.
1:41
If someone were to ask you, what exactly is a
1:44
terrible triad injury? Beyond the scary name.
1:47
What are the three absolute core components that
1:50
define it? Right. The triad refers to the three
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key elements that must be present simultaneously.
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Firstly, you have a posterior elbow dislocation.
1:58
Okay. Secondly, a fracture of the radial head
2:00
or the neck. Right, the radius bone. And thirdly,
2:03
a fracture of the coronoid process of the ulna.
2:05
The ulna. Yeah. It's the combination of this
2:08
dislocation with those specific bony injuries
2:11
that creates the Well, the profound instability
2:15
characteristic of the terrible triad. So it's
2:18
the dislocation plus the radial head fracture
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plus the coronoid fracture. Got it. That's the
2:22
definition. Second question. You mentioned a
2:25
simple fall can cause this. What is the specific
2:28
mechanism, the typical scenario that brings these
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three components together in such a damaging
2:34
way? Well, the classic mechanism described in
2:37
the sources as accounting for around 60 % of
2:39
cases is a fall onto an outstretched arm. Right,
2:42
the fail injury. Precisely. The critical forces
2:45
involved are axial loading that's force traveling
2:48
up the arm through the radius. Okay. Combined
2:51
with a valgus force, which is a bending force
2:53
pushing the elbow inwards towards the midline
2:55
of the body. Ah, okay. And external rotation
2:58
or supination of the forearm relative to the
3:01
humerus. So twisting outwards. Yes. Imagine planting
3:04
your hand slightly lateral to your body as you
3:06
fall. This often generates the necessary combination
3:08
of forces to disrupt the elbow, typically starting
3:11
from the lateral side and progressing inwards.
3:13
Axial load, valgus, external rotation. That specific
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cocktail of forces from something as common as
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a fall is, well, it's quite sobering. It is indeed.
3:23
And finally, going back to that name, why was
3:26
this injury historically considered so terrible?
3:29
What were the outcomes like in the past? Historically,
3:32
yes, managing these injuries was fraught with
3:34
difficulty, really quite problematic. How so?
3:37
Even after they managed to reduce the dislocation
3:40
and attempt some sort of fixation, the elbow
3:42
often remained unstable or, perhaps more commonly,
3:46
became severely stiff. Ah, stiffness. Exactly.
3:50
The rates of complications like recurrent dislocation,
3:52
the elbow just popping out again and significant
3:54
loss of motion were very high. Surgeons really
3:56
struggled to reliably restore stability and achieve
3:59
good functional outcomes. Leading to long -term
4:01
problems. Yes, leading to long -term disability
4:03
for many patients. The name... truly reflected
4:06
that historical difficulty and the high potential
4:10
for a poor result. That historical context certainly
4:13
underscores the challenge. It sounds like the
4:14
fight against instability on one hand and stiffness
4:17
on the other is absolutely central to this injury.
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That's the core dilemma. OK, let's unpack this
4:22
further, diving into the details from the sources.
4:25
To truly appreciate what goes wrong in a terrible
4:28
triad, we first need to understand the normal
4:30
elbow, its incredibly complex anatomy, and how
4:34
it achieves stability. Absolutely. Yeah. You
4:36
can't fix it if you don't understand how it's
4:38
supposed to work. The elbow is far more sophisticated
4:41
than a simple hinge. Right. As the sources detail,
4:44
it's actually a single joint capsule containing
4:47
three articulations. The humeral nerve joint,
4:50
the radiocapitular joint, and the proximal radial
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nerve joint. Three joints in one capsule. Yes.
4:56
It's described as a trochleogene lemoid joint.
5:00
Trochleogene lemoid. Quite a mouthful. It is.
5:03
It basically means it's primarily a hinge, but
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it also allows rotation. So the hinge part is
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where? That's the main articulation, the humeralnar
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joint. The trochlea of the humerus, which is
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shaped a bit like a spool, articulates with the
5:14
greater sigmoid notch of the ulna. This gives
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you the primary hinge motion flexion and extension.
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And it's inherently quite stable due to the way
5:22
the bones fit together, especially in full extension
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and near full flexion. And the rotation comes
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from the radiocapitalar joint. Is that right?
5:29
Precisely. This is where the radial head, which
5:32
has a sort of concave, articular surface, rotates
5:35
against the capitolum of the humerus, the rounded
5:38
end of the humerus on the lateral side. This
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allows for pronation and supination, turning
5:44
your palm down and up. The proximal radial nar
5:47
joint, where the radial head also contacts the
5:49
ulna, is critical for this rotation, too. And
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it's mainly stabilized by the anular ligament.
5:54
Okay, so bending and twisting are both happening
5:56
here. The sources particularly highlight the
5:59
coronoid process and the radial head as key bony
6:02
players in the terrible triad. What are their
6:04
specific roles in normal stability? They are
6:07
absolutely crucial osseous stabilizers, the bony
6:11
parts providing stability. Right. The coronoid
6:14
process, which is a projection on the front of
6:16
the ulna, acts as an anterior buttress. It's
6:19
vital for preventing the ulna from sliding backwards
6:21
on the humerus, especially as the elbow flexes
6:24
beyond about 30 degrees. So it stops it dislocating
6:26
backwards in flexion. Essentially, yes. What's
6:30
particularly significant and often fractured
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in the terrible triad is a specific part of the
6:35
coronoid called the sublime tubercle. It's on
6:38
the antiromedial aspects. Antiromedial, front
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and inside. Correct. And this is the primary
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attachment site for the crucial anterior bundle
6:47
of the medial collateral ligament, the MCL. Ah,
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so... Fracturing the cornoid isn't just losing
6:52
a piece of bone. You're potentially detaching
6:54
a major ligament at the same time. Exactly. Especially
6:57
if it's a significant fragment involving that
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sublime tubercle or the wider anti -romedial
7:02
facet as described by the odriscal classification
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we'll probably come on to. Okay. Then you have
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the radial head. Well, the humoral inner joint
7:09
is the main stabilizer in the bending plane.
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The radial head plays a vital secondary role.
7:14
Secondary. How so? particularly against valgus
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stress, that inward bending force, and also against
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rotational instability. It contributes up to
7:23
30 % of the resistance to valgus forces. 30%.
7:26
That's significant. It is. And crucially, it's
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also a primary bony restraint to something called
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post -relateral rotatory instability, or PLRI.
7:37
It helps prevent that abnormal outward twisting
7:39
of the radius and ulna on the humerus. Wow. Up
7:42
to 30 % of valgus resistance. That's a huge contribution
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for a bone we often just think about for rotation.
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It really highlights how interconnected these
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structures are. Absolutely. Everything works
7:54
together. What about the main ligamentous stabilizers
7:57
then, the soft tissues? The static stabilizers,
8:00
the ligaments and the capsule are arguably even
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more critical for stability, especially against
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sudden forces. Right. On the medial side, The
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inside, you have the medial collateral ligament,
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or MCL complex. This is the primary restraint
8:12
of algus stress. It also resists internal rotation
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stress. It has three bundles described. The anterior
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bundle is the strongest. It's taught from 0 to
8:20
60 degrees of flexion. The main working range.
8:22
Often, yes. Then the posterior bundle is taught
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in deeper flexion, say 60 to 120 degrees. And
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there's a transverse ligament, which is generally
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considered less functionally important. And you
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mentioned the anterior bundle attaches to the
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cornoid. Yes, it attaches right onto that sublime
8:37
tubercle of the cornoid. This connection makes
8:40
injuries to that part of the cornoid, particularly
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destabilizing for the medial side. Right, you
8:44
lose the bone and the ligament anchor. And on
8:46
the lateral side, that LCL complex seems key
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in the mechanism you described earlier. Yes,
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absolutely. The lateral -collateral ligament
8:54
complex is the primary restraint to that poster
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lateral rotatory instability, the PLRI. It originates
9:00
from the lateral epicondyle of the humerus, the
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bony prominence on the outside. Okay. Traditionally,
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it's described as having several components.
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The radial collateral ligament, the annular ligament,
9:10
which we mentioned stabilizes the proximal radial
9:13
lunar joint. Right. The accessory lateral collateral
9:15
ligament, and the key one, the lateral ulnar
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collateral ligament, the LUCL. The LUCL is frequently
9:21
mentioned in the sources as being paramount.
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Is it the single most important lateral structure?
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Well, the LUCL is certainly often considered
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the main functional component of the lateral
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complex. Disruption of this ligament is consistently
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associated with PLRI. OK, however, it's maybe
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a bit more nuanced. Some biomechanical studies
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suggest that the entire complex functions more
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as a single unit, originating from a common footprint
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on the lateral epicondyle and inserting onto
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the ulna. Like a sheet of tissue. Sort of, highlighting
9:52
the concept of a continuous capsule ligamentous
9:55
complex. There's also a thickening of the post
9:58
-relateral capsule, often referred to as the
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Osborne Cotteral Ligament, which also contributes
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to stability, acting as a check grain against
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post -relateral rotation and varus angulation.
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Varus is the outward bending. Correct, the opposite
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of valgus. So while the L -U -C -L is crucial,
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it operates within this broader complex lateral
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network. It's not just acting alone. That level
10:19
of detail is really helpful. It's not just one
10:21
simple rope holding things together. It's more
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like a woven structure. A good analogy. And you
10:26
also mentioned the joint capsule itself. Yes.
10:28
The anterior and posterior capsules are also
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important contributors to overall stability.
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The anterior capsule provides some secondary
10:35
restraint to valgus stress and also contains
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nerve endings contributing to proprioception,
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the sense of joint position. So it tells your
10:44
brain where your elbow is. In part, yes. And
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both capsules are typically torn. quite extensively
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in elbow dislocations. And finally, the muscles.
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The dynamic stabilizers, yes. The muscles crossing
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the joint, like the aconius, triceps, brachialis,
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and the common flexor and extensor origins. By
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providing compressive forces across the joint
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during contraction and contributing to proprioception,
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they add another layer of stability, especially
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during active movement. It's incredible how many
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different elements have to work in perfect harmony.
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The specific shakes of the bones, the tensile
11:17
strength of the ligaments, the integrity of the
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capsule, and the coordinated action of the muscles.
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It's a truly intricate system, built for stability
11:24
during load bearing, but also for remarkable
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mobility for function. And when you disrupt key
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players from multiple categories like this, bone,
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ligament, capsule. You get the profound multiplanar
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instability seen in a terrible triad. It's not
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just one structure failing. It's a catastrophic
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cascading failure involving bony blocks, critical
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ligaments, and the surrounding capsular support.
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Which brings us back to the mechanism again,
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but perhaps in more detail now we understand
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the anatomy. How do those specific forces you
11:55
described, the axial load, valgus stress, external
11:58
rotation, how do they specifically create this
12:01
pattern of simultaneous bony and ligamentous
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damage? This is where the concept of the Hori
12:07
circle comes into play, which the source has
12:09
mentioned. It describes the predictable sequence
12:12
of injury progression around the elbow. The Hori
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circle sounds like a map of destruction. In a
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way, yes. It typically starts laterally and spirals
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around the elbow medially as the dislocating
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forces continue and overcome each stabilizer
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in turn. So stage one? Stage one involves the
12:28
disruption of the lateral -collateral ligament
12:29
complex. This initiates the instability, allowing
12:33
the radius and ulna to start rotating post -relaterally
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relative to the humerus. The outward twisting
12:38
starts? Correct. If the force continues, you
12:40
progress to stage two. This involves carrying
12:42
of the anterior and posterior capsules. The joint
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is now actively dislocating or subluxating. But
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the medial side, the MCL, might still be intact,
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providing some sort of unstable hinge. However,
12:55
in the terrible triad, the forces are usually
12:57
higher. Pushing it further. Exactly. Pushing
13:00
into stage three, where the medial collateral
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ligament is also disrupted. Now you've lost stability
13:05
on both sides, plus the capsule. And the bony
13:08
fractures are a consequence of this progression.
13:11
When do they happen? Precisely. The terrible
13:13
triad is considered an osseous extension, a bony
13:17
consequence of this stage three disruption of
13:19
the whole right circle. Right. As these severe
13:21
forces overcome the lateral ligaments, then the
13:24
capsule, and finally the medial ligament, the
13:27
bones themselves start to fail under the stress.
13:30
The radial head is forcefully impacted against
13:32
the capitellum causing it to fracture. Stashed
13:34
against the humerus. Effectively, yes. Simultaneously,
13:38
as the ulma is displaced posteriorly, the coronoid
13:41
process acting as that anterior buttress and
13:43
also the anchor for the MCL is sheared off or
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fractured as it collides with the trochlea of
13:48
the humerus. So it gets knocked off from behind.
13:50
Or sheared off by the force. So it's a progressive
13:53
failure of the soft tissues culminating in these
13:56
specific bony injuries occurring at the points
13:58
of maximum stress or weakest structure. What's
14:01
really insightful from the sources is that the
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bony injuries aren't just random events. They
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are a direct result of the extreme forces tearing
14:08
through the stabilizing soft tissues in that
14:11
specific lateral to medial sequence. That sequential
14:14
failure from lateral to medial, with the bony
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fractures being the sort of final breaking points,
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that paints a very clear albeit brutal picture
14:23
of the forces at play. It does. It helps understand
14:26
why these three injuries occur together. OK,
14:28
so a patient presents after this type of fall,
14:31
their elbow is maybe obviously dislocated or
14:33
just looks severely injured. How do clinicians
14:36
confirm the terrible triad diagnosis and understand
14:39
the full extent of the damage? Well, a high index
14:41
of suspicion is absolutely vital, especially
14:44
in the context of any elbow dislocation. Yeah.
14:46
You assume it could be this until proven otherwise.
14:48
The initial clinical evaluation involves a thorough
14:51
assessment. Beyond any obvious deformity, you're
14:54
looking carefully for swelling, bruising, and
14:57
gently palpating for tenderness, which might
15:00
indicate specific fracture sites or ligamentous
15:03
injury points. And critically. Critically, a
15:06
neurovascular examination is non -negotiable.
15:09
You must check the radial pulse and capillary
15:11
refill and assess nerve function, sensation,
15:14
and motor power, particularly for the ulnar nerve.
15:17
Why the ulnar nerve specifically? It runs right
15:20
behind the medial epicondyle, so it's very vulnerable
15:23
to being stretched or even trapped during the
15:25
dislocation or by fracture fragments around the
15:27
medial elbow. Assessing instability clinically
15:30
can be very difficult in the acute setting. because
15:32
of pain and muscle guarding, though sometimes
15:35
gross instability is horribly obvious. Is there
15:37
anything else you look for clinically, any associated
15:39
injuries? Yes, always. Always remember the potential
15:42
for associated injuries, particularly distal
15:44
ones. Specifically, in the context of a radial
15:47
head fracture with elbow instability, you absolutely
15:50
must examine the distal radial solnar joint down
15:52
at the wrist. The wrist joint. Why? Because the
15:55
interosseous membrane, a strong sheet connecting
15:57
the radius and ulna along their length, can transmit
16:00
force. A severe radial head injury, especially
16:04
if it's comminuted or involves the neck, can
16:06
disrupt this membrane and also injure the DRUJ
16:09
ligaments at the wrist. Ah, that's the S. exlipresti
16:12
injury. Exactly. That's the S. exlipresti injury.
16:15
And missing it can have severe functional consequences
16:17
later on, like wrist pain and instability and
16:21
proximal migration of the radius. That's a critical
16:23
point. An elbow injury could be directly linked
16:25
to a significant wrist problem. And then imaging.
16:28
That must be key. Imaging is fundamental, yes.
16:31
Plane radiographs are always the first step.
16:33
Standard AP and lateral views are essential.
16:36
If the elbow is dislocated on arrival, you ideally
16:38
need films before reduction and definitely after
16:41
reduction to confirm concentric reduction of
16:44
both the humeralnar and radiocapitalar joints.
16:47
How do you check that concentricity? On the lateral
16:49
view. A line drawn through the center of the
16:51
radial neck should always pass through the center
16:54
of the capitellum, regardless of the flexion
16:56
angle. Any deviation suggests subluxation or
16:59
malalignment. Radiographs can identify the dislocation
17:02
and often show the significant radial head or
17:05
coronoid fractures, but... But they have limitations.
17:07
Yes. They're often limited in showing complex
17:10
bony detail, subtle displacement, or the exact
17:12
size and shape of fragments, especially the coronoid.
17:16
So x -rays give you the initial picture, but
17:18
for the full story, what else is needed? That's
17:21
where computed tomography, the CT scan, becomes
17:24
absolutely invaluable. It's almost mandatory
17:26
in complex elbow fracture dislocations like the
17:29
terrible triad. Why is CT so crucial here? CT
17:32
provides detailed cross -sectional images and
17:34
crucially allows for 3D reconstruction. This
17:37
is vital for precisely characterizing the fracture
17:39
patterns. For example? For example, the size,
17:42
shape, location, and displacement of the coronoid
17:45
fragment, which can be much more complex than
17:47
it appears on x -ray, particularly those tricky
17:49
intramedial facet fractures. It also details
17:52
the comminution and displacement of the radial
17:54
head fracture any articular step off and helps
17:58
identify any small bone fragments that might
18:00
be trapped within the joint. So it's like a blueprint
18:02
for surgery. Exactly. This detailed 3D blueprint
18:05
is essential for accurate surgical planning.
18:08
Fluoroscopy using live x -ray under anesthesia
18:11
is also often used intraoperatively to dynamically
18:14
assess the stability after the bony and ligamentous
18:17
repairs have been performed. Right, so the CT
18:19
scan is the key to truly understanding the specific
18:22
anatomy of the bony damage, which plain x -rays
18:25
might easily miss. Combining that detailed imaging
18:28
with the clinical picture allows you to confirm
18:30
the diagnosis and plan the next steps. Precisely.
18:33
Diagnosis and planning are paramount. Okay, once
18:35
the diagnosis is made, you're faced with this
18:37
really challenging multi -component problem.
18:41
The dislocation, the radial head fracture, the
18:43
coronoid fracture, and the extensive ligamentous
18:46
disruption. The sources discuss various classification
18:49
systems for the bony injuries. How do these systems
18:53
help surgeons make sense of this chaos and, crucially,
18:56
guide treatment decisions? Classification is
18:59
absolutely vital, yes. It helps standardize description
19:02
and guide surgical management because different
19:04
fracture patterns behave differently biomechanically
19:06
and often require different fixation strategies.
19:10
For coronoid fractures, the traditional classification
19:12
is the Regan -Mori system. It's based simply
19:15
on the height of the fragment seen on the lateral
19:17
x -ray view. Type 1 is just the tip, type 2 is
19:20
less than 50 % of the coronoid height, and type
19:22
3 is more than 50 % of the height. Seems straightforward,
19:25
but the source has noted a limitation there.
19:27
Yes, the main limitation of Regan -Mori is that
19:29
it doesn't adequately capture the crucial three
19:31
-dimensional location of the fracture, particularly
19:34
those involving the anteromedial facet. The bit
19:36
where the MCL attaches? Exactly. Those anteromedial
19:40
facet fractures can be highly destabilizing,
19:43
even if they aren't particularly large in height
19:45
on the lateral view. The odriscal classification
19:48
addresses this much better. How does odriscal
19:50
work? It categorizes fractures based on their
19:53
anatomical location. Type 1 involves the tip,
19:56
type 2 involves the anteromedial facet, and type
19:59
3 involves the base of the coronoid. and there
20:02
are subtypes within those. And that's more useful
20:05
surgically. Yes, the adriscal system is generally
20:07
considered more useful for surgical decision
20:09
-making because it directly relates the specific
20:12
fracture pattern to the injured ligament attachment
20:14
like the MCL on the antiremedial facet and therefore
20:17
informs the necessary fixation strategy and surgical
20:20
approach. That makes sense. Location dictates
20:23
strategy. And for the radial head fracture, what
20:25
systems are used there? The Mason classification
20:28
is the classic system, widely known. It's based
20:30
purely on the radiological appearance. Type 1
20:33
is non -displaced. Type 2 is displaced, but generally
20:36
considered repairable, often causing a mechanical
20:38
block to motion. And type 3 is combinated, shattered
20:42
into multiple pieces, typically not repairable.
20:45
Johnson later added type 4 for any radial head
20:47
fracture associated with an elbow dislocation,
20:50
which is, of course, the pattern we see in a
20:52
terrible triad. And the Hotchkiss modification,
20:54
how does that refine Mason? The Hotchkiss modification
20:57
builds on Mason by incorporating clinical findings
21:00
and explicitly guiding treatment. It helps distinguish
21:03
between fractures that might, very rarely, be
21:06
treated non -surgically. Type 1, less than 2
21:09
millimeter displacement, no block. OK. Those
21:11
suitable for open reduction and internal fixation,
21:15
or RIF type 2, more than 2 millimeter displacement,
21:18
causing a block but still repairable. Right.
21:21
And those requiring replacement, usually an arthroplasty.
21:24
Type 3 committed, not repairable. This is a more
21:27
clinically oriented and treatment -focused classification.
21:30
Are there any systems mentioned that try to classify
21:32
the entire injury pattern, taking into account
21:34
both the bones and the ligaments? Yes, the wants
21:37
at all. Reddington classification is mentioned
21:40
in the sources. It's based on the three -column
21:42
concept of the elbow, a lateral column, a middle
21:45
ulnar column, and a medial column. It classifies
21:48
complex fracture dislocations based on which
21:51
columns and their associated key ligaments are
21:53
injured. In this system, a type C injury essentially
21:57
aligns with the terrible triad pattern, involving
21:59
significant disruption of both lateral and medial
22:02
stability structures. So it helps frame the overall
22:05
instability pattern. So using these classification
22:08
systems helps translate the complex imaging findings
22:11
into categories that directly inform the treatment
22:13
plan. What does that treatment plan typically
22:16
look like? Is non -surgical management ever a
22:18
realistic option for such an inherently unstable
22:20
injury? For the vast, vast majority of terrible
22:23
triad injuries, surgical management is necessary.
22:26
Non -surgical treatment is only appropriate in
22:28
extremely rare and select cases that meet very
22:31
strict criteria. Such as? The elbow must be perfectly
22:33
concentric, perfectly reduced after the initial
22:36
reduction. The radial head and coronoid fractures
22:38
must be very small and judged to be inherently
22:41
stable. And critically, there must be enough
22:43
inherent stability to allow immediate, protected
22:46
early range of motion without any risk of the
22:48
elbow subluxating or re -dislocating. So very
22:51
specific circumstances. Extremely specific. Even
22:54
then, it involves maybe a week or so of immobilization,
22:57
followed by a very cautious restricted motion
23:00
protocol. Essentially, if there's any significant
23:03
displacement of the fractures or any ongoing
23:06
concern for instability, surgery is indicated,
23:09
which is most cases. So surgery is definitely
23:12
the mainstay. What's the overarching goal of
23:14
the surgery, then? The primary goal, the absolute
23:17
key, is to restore enough stability to permit
23:19
early motion. Why is early motion so important?
23:22
Because prolonged immobilization leads to severe
23:25
stiffness, which, as we said, is the most common
23:28
and often most debilitating complication. So,
23:31
surgery aims to fix the bony fractures and repair
23:33
the torn ligaments reliably enough that the patient
23:35
can safely start moving the elbow actively within
23:38
just a few days. OK. The sources describe the
23:41
principle of inside outward, or perhaps more
23:43
commonly, lateral to medial repair. This involves
23:46
addressing the lateral structures first, then
23:48
the bone, and finally addressing the medial side,
23:51
only if instability persists, sequentially restoring
23:54
stability. Let's delve into the surgical procedures
23:57
mentioned in the soredices. What are the common
23:59
approaches the incisions use to get to these
24:01
structures? Surgeons typically use either separate
24:04
approaches or sometimes a single larger approach,
24:06
depending on the specific injury pattern and
24:08
their preference. A direct lateral approach provides
24:12
excellent access to the radial head and the LCL
24:15
complex. Okay. A medial approach gives access
24:18
to the MCL and also allows for fixation of some
24:21
coronoid fractures, particularly those antiremedial
24:23
facet ones. Right. Alternatively, a universal
24:26
posterior approach, often using a technique that
24:29
spares or reflects the triceps tendon, can allow
24:31
access to both the medial and lateral columns
24:34
through a single large incision. Some specific
24:37
coronary fractures might even require an additional
24:39
small anterior approach for fixation. The choice
24:42
really depends on the surgeon's experience and
24:45
the specific fractures needing fixation. And
24:47
the specific techniques for fixing the bony and
24:50
ligamentous injuries. Let's start with the radial
24:52
head. Okay. For the radial head, if it's deemed
24:54
repairable, generally fitting the Mason type
24:57
two or Hotchkiss type two criteria, meaning usually
25:00
less than three or four pieces, less than 40
25:02
% of the articular surface involved and displaced.
25:04
Then ORF. Yes. Then open reduction and internal
25:07
fixation, O -R -A -F, is performed using small
25:11
specialized screws and sometimes plates. The
25:13
sources emphasize the importance of careful screw
25:16
or plate placement within the safe zone. The
25:19
safe zone, what's that? That's the post -relateral
25:21
aspect of the radial head, roughly a 90 to 110
25:25
degree arc measured from the radial styloid when
25:27
the forearm is held in neutral rotation. Placing
25:30
hardware here minimizes the risk of it impinging
25:32
on the ulna or humerus during pronation and supination
25:35
and reduces risk to the posterior interosseous
25:38
nerve. Okay, crucial detail. What if the radial
25:41
head is just too shattered to repair? Mason type
25:43
3. If it's severely commended, Mason type 3,
25:46
Haschges type 3, typically more than three or
25:48
four fragments, basically irreparable, then it's
25:51
usually replaced with a radial head arthroplasty.
25:53
That's a metal implant that mimics the shape
25:55
of the radial head. And sizing is important here.
25:57
Absolutely critical. Sources stress that meticulous
26:00
attention must be paid to implant sizing. An
26:03
implant that is too long or over lengthened can
26:06
cause significant pain, stiffness by overstuffing
26:09
the joint, and wear on the capotella. An implant
26:12
that is too short or undersized will simply not
26:16
provide adequate stability. It won't restore
26:18
the secondary valgus and rotational restraint.
26:21
The goal is usually to seat the radial head implant
26:23
approximately two millimeter distal to the tip
26:26
of the native coronoid process. Right. And the
26:29
sources were very clear about not just removing
26:31
the radial head. Extremely clear. Radial head
26:34
resection, just cutting it out and leaving nothing,
26:37
is generally strongly contraindicated in unstable
26:39
or dislocated elbows like the terrible triad.
26:42
It removes a key secondary stabilizer, massively
26:46
increasing the risk of proximal migration of
26:48
the radius over time, leading to risk problems
26:50
that Essex -Lepresti issue again. That's a really
26:53
critical point about not just removing it if
26:55
it's broken and the elbow's unstable. Okay, what
26:57
about the coronoid fracture? How is that fixed?
26:59
Coronoid fixation techniques vary quite a bit
27:02
based on the fracture size and location, often
27:05
guided by that otriscal classification. Smaller
27:08
tip fractures, type 1, might be fixed with sutures
27:10
passed through drill holes in the ulna or sometimes
27:13
using suture anchors. Occasionally they can even
27:16
be lassoed with sutures passed through a radial
27:18
head implant if one is being used. And bigger
27:21
fragments? Larger fragments, especially those
27:23
involving the anti -remedial facet or the base
27:26
of the coronoid, or Driscoll type 2 or 3, typically
27:28
require more robust fixation with screws or even
27:31
small plates for stability. These fractures can
27:34
sometimes be quite challenging to access and
27:36
fix directly, requiring specific surgical approaches.
27:39
Right. And finally, the torn ligaments, the LCL
27:42
and maybe the MCL. The LCL complex is nearly
27:45
always injured and requires repair. It's typically
27:48
repaired by reattaching it anatomically back
27:50
to its origin on the lateral epicondyle. Often,
27:53
it's avulsed as a sleeve of tissue from the bone.
27:56
How is it re -appatched? Suture anchors, small
27:58
implants drilled into the bone with strong sutures
28:00
attached, are commonly used to re -secure the
28:02
ligament footprint back to the bone, typically
28:05
centered around the axis of rotation near the
28:07
center of the capitella curvature. And the forearm
28:09
position matters during LCL repair? Yes, the
28:12
forearm position during the LCL repair is important.
28:14
Sources suggest repairing the LCL with the forearm
28:17
held in pronation if the MCL is intact. Pronation
28:21
tends to tighten the LCL and helps reduce that
28:23
post -relateral rotation. And if the MCL is also
28:26
torn? If the MCL is also significantly injured
28:29
and requires repair, then the LCL is usually
28:32
repaired with the forearm held in supination
28:34
or perhaps neutral rotation to allow appropriate
28:37
tensioning of both ligaments simultaneously.
28:40
And is the MCL always repaired? Not always. The
28:43
MCL itself is typically repaired only if the
28:45
elbow remains unstable after fixing the bony
28:47
injuries and repairing the LCL. Instability is
28:51
often checked dynamically under anesthesia, particularly
28:54
looking for gapping on the medial side when nevelgus
28:56
stress is applied, especially in extension beyond
28:59
30 degrees. If it's still unstable, then the
29:02
MCL needs repair too. Okay, that's a lot of complex
29:05
repair work. What if, even after fixing the bone
29:08
and repairing the ligaments, the elbow still
29:10
doesn't feel stable enough for that crucial early
29:12
motion? That's a challenging situation, indicating
29:15
persistent growth instability. In such cases,
29:19
some form of supplementary stabilization might
29:21
be required temporarily. Like what? This could
29:24
involve applying a hinged external fixator. This
29:27
is a frame outside the arm, connected by pins
29:29
above and below the elbow, that allows controlled
29:31
motion within a set range but protects the internal
29:34
repairs by spanning the joint externally. Are
29:37
there other options? Static external fixators
29:40
rigidly hold the joint in one position. usually
29:43
flexion, but carry a much higher risk of stiffness
29:45
due to the complete immobilization. Internal
29:49
joint stabilizer devices are also an option,
29:52
implants placed across the joint internally,
29:54
but they often require a second surgery for removal
29:57
and have their own potential complications. Cross
30:00
-kitting the humeral Nar joint in a reduced position
30:02
with temporary wires is also mentioned in one
30:05
source as a possibility for very short -term
30:07
stability. But the goal is always to achieve
30:09
enough primary stability from the internal repairs
30:12
to allow that early motion if at all possible.
30:15
It's clearly a very complex surgical undertaking
30:18
involving multiple intricate repairs. The timing
30:21
of the surgery is also something highlighted
30:23
quite strongly in the sources. Yes, this seems
30:25
to be a critical factor impacting the final outcome.
30:28
Several sources emphasize that delayed surgery,
30:31
particularly if it performed more than 14 days
30:33
after the initial injury, is associated with
30:35
significantly higher rates of stiffness and generally
30:38
poorer functional outcomes compared to surgery
30:40
performed within a shorter time frame. Sooner
30:42
is better. Generally, yes. Surgery performed
30:46
ideally within 24 hours up to perhaps 14 days
30:49
seems preferable. Early anatomical reduction
30:52
and scable fixation appear to interrupt the inflammatory
30:55
and scarring processes that lead to severe joint
30:57
contracture and potentially heterotopic ossification.
31:01
Which means? Which means accurate and timely
31:03
diagnosis, often requiring that prompt CT scanning
31:06
we discussed, is key not just for planning the
31:09
surgery, but for facilitating early surgical
31:11
intervention to improve the chances of a good
31:14
outcome. So diagnose quickly. operate comprehensively
31:18
and in a timely manner, and then what? What's
31:20
the crucial next step in the patient's journey
31:22
towards regaining function? Post -operative rehabilitation.
31:26
It is absolutely paramount and in many ways equally
31:29
as challenging as the surgery itself. Why so
31:31
challenging? It's a very delicate balancing act
31:33
between protecting the surgical repairs, which
31:35
need time to heal, and regaining motion to prevent
31:37
stiffness. How is that balance managed initially?
31:40
Initial immobilization is kept to an absolute
31:43
minimum. usually just seven to 10 days. The elbow
31:46
is typically held in a splinter brace at around
31:48
90 degrees of flexion, potentially with specific
31:51
forearm rotation pronation or neutral, depending
31:54
on which ligaments were repaired and how. And
31:56
after that brief period, what happens then? Early
31:59
active motion is initiated very quickly, often
32:01
within 48 hours or at least within a few days
32:03
postoperatively, once the initial pain and swelling
32:06
start to settle. Active motion, so the patient
32:09
moves the elbow themselves? Yes, gentle active
32:11
range of motion. Studies strongly support that
32:14
initiating this as soon as stability permits
32:16
significantly improves functional outcomes and
32:18
is the best strategy we have to combat stiffness.
32:21
Patients are typically guided by a therapist
32:23
through controlled flexion and extension within
32:25
a safe prescribed arc of motion. Are there any
32:28
specific movements or ranges to avoid initially
32:31
to protect repairs? Yes. Often patients are advised
32:34
to avoid achieving full or near full extension,
32:37
particularly the last 30 degrees or so of extension
32:40
for the first few weeks. typically around four
32:43
weeks. Why avoid full extension? That terminal
32:45
extension position can put significant stress
32:47
on the healing LCL and potentially the MCL repairs,
32:51
depending on the specific pattern of instability.
32:54
Avoiding it helps protect the reconstruction
32:56
during the early healing phase. Strengthening
32:59
exercises are introduced much more gradually,
33:02
usually starting around six to eight weeks post
33:04
-op. What sort of strengthening? beginning with
33:06
low resistance activities like gentle wall push
33:08
-ups or weight bearing on the hands in a quadruped,
33:11
all -force position, progressing slowly as tolerated
33:14
and as healing progresses. This clearly requires
33:17
close collaboration and expert guidance. Absolutely.
33:20
A dedicated physiotherapist, ideally one experienced
33:23
with complex elbow injuries, plays a vital role
33:26
throughout the entire rehabilitation process.
33:28
They guide the patient, monitor progress, adjust
33:30
the program based on response, and manage expectations.
33:34
And how is success measured? Functional outcomes
33:36
are commonly tracked using validated questionnaires
33:39
like the D -A -S -H score disabilities of the
33:41
arm, shoulder, and hand, and the M -E -P -S,
33:44
the male elbow performance score. M -E -P -S
33:46
scores range from 0 to 100, with scores of 90
33:49
-100 indicating an excellent functional result.
33:51
Despite the best surgery and dedicated rehab,
33:54
what are the potential setbacks or complications
33:56
that patients and surgeons might still encounter?
33:59
This injury sounds like it can fight back. Unfortunately,
34:03
yes. Given the severity of the initial trauma
34:06
and the complexity of the reconstruction, complications
34:08
are relatively common, even with optimal management.
34:12
Stiffness is arguably the most frequent significant
34:14
complication. Stiffness again. Yes, reported
34:17
incidences range from 5 % up to as high as 15
34:20
% or even more in some series, requiring further
34:23
intervention. It often presents as a significant
34:26
loss of extension of flexion contracture. It
34:29
can be caused by excessive scar tissue formation
34:31
within and around the joint or by heterotopic
34:34
ossification. Ulnar nerve irritation or entrapment
34:37
is also a significant risk factor for pain and
34:39
can contribute to limiting motion. Heterotopic
34:42
ossification, that's the abnormal bone growth
34:44
outside the normal skeleton you mentioned earlier.
34:46
Yes, exactly. HO is a major concern after these
34:49
complex elbow injuries. Its incidence in operatively
34:52
treated terrible triads can be disturbingly high,
34:56
reported up to 43 % radiographically in some
34:58
studies, though not all of that is clinically
35:01
significant. What causes it? HO seems associated
35:03
with a severe of the initial soft tissue injury,
35:06
the amount of tissue damage during surgery, prolonged
35:08
immobilization, any associated nerve injury,
35:11
infection, and significantly delayed surgical
35:14
intervention seems to increase the risk. When
35:16
does it appear? It typically appears radiographically
35:19
within three to four weeks post -injury and can
35:22
cause really severe restrictions in range of
35:24
motion, potentially leading to ankylosis, which
35:27
is complete fusion of the joint in the worst
35:28
cases. Excision of the HO may be required later
35:31
on, but that's a complex procedure itself with
35:34
risks. Is there anything done to prevent HO?
35:37
Sources discuss prophylaxis. like using anti
35:40
-inflammatory drugs such as endomethacin. But
35:42
note the evidence for its effectiveness specifically
35:44
in traumatic elbow HO is still debated. Radiation
35:48
prophylaxis is sometimes used, particularly after
35:51
HO excision. But it's often considered too risky
35:54
after the initial fracture surgery due to potential
35:56
negative effects on fracture healing, though
35:58
it is mentioned for severe burn patients with
36:00
associated elbow injuries. So HO is a significant
36:05
potential hurdle. What else is on the complication
36:07
list after a terrible triad? surgery? Well, recurrent
36:09
instability is another risk. This can happen
36:12
if the initial surgical repairs fail, perhaps
36:14
the fixation wasn't robust enough, or if subtle
36:17
injuries, especially smaller coronoid fractures,
36:20
were underestimated or inadequately fixed initially.
36:23
Infection? Infection is a serious concern, especially
36:25
with implants present. Rates have been reported
36:27
up to 17 .5 % in some older series, which can
36:30
be devastating, often requiring multiple further
36:33
surgeries. Nerve problems? Nerve injuries, such
36:36
as ulnar or radial nerve, specifically the posterior
36:38
interosseous branch entrapments or palsies, can
36:41
occur in up to 23 .5 % of cases according to
36:44
some sources. These can be due to the initial
36:47
injury, swelling, scar tissue formation later
36:49
on, or sometimes proximity to surgical hardware.
36:52
And other issues. Non -union or malunion of the
36:54
fractures, meaning they don't heal or heal in
36:56
a bad position. Post -traumatic arthritis or
36:59
degenerative joint disease is a long -term risk
37:01
due to the initial cartilage damage sustained
37:03
at the time of injury, or due to residual instability
37:06
or joint incongruity. And issues related to the
37:09
hardware itself, painful, prominent, or loose
37:11
implants sometimes requiring removal, are also
37:14
potential complications. It really underscores
37:17
why this injury pattern is so challenging to
37:19
manage comprehensively. Given all those potential
37:21
issues, what's the realistic long -term outlook?
37:23
What can someone generally expect in terms of
37:25
prognosis after navigating this very difficult
37:28
injury in its treatment? Historically, as the
37:30
name terrible triad implied, the prognosis was
37:33
often poor. High rates of chronic pain, significant
37:37
stiffness, limiting function, and persistent
37:39
instability leading to disability were common.
37:42
But things have improved. Yes. Thankfully, with
37:45
significant advancements in our understanding,
37:47
better imaging, modern surgical techniques, particularly
37:50
more stable fixation methods, and reliable radial
37:53
head replacement options, and structured early
37:55
rehabilitation protocols, the outcomes have substantially
37:58
improved. Generally, Good to excellent functional
38:02
results, as measured by those MEPs and DASH scores,
38:06
often averaging above 75, are now achievable
38:08
for many patients. So the terrible aspect is
38:11
perhaps less about the inevitable outcome nowadays
38:14
and more about the complexity of the injury and
38:16
its management. Precisely. I think that's a fair
38:18
summary. With appropriate timely and skilled
38:20
care, it is often possible to achieve a good
38:23
functional outcome, allowing return to most activities.
38:26
What predicts a better outcome? The sources consistently
38:29
highlight that key predictors of a better prognosis
38:32
include accurate and timely diagnosis, often
38:36
relying on that crucial CP scan, prompt surgical
38:39
reduction and stable fixation or replacement
38:41
that allows for early protected motion, and,
38:44
very importantly, adherence to a rigorous therapist
38:47
-guided postoperative rehabilitation program.
38:50
But it's important to have realistic expectations.
38:53
Yes, absolutely. It's also important for patients
38:56
to have realistic expectations. Achieving a completely
38:59
normal elbow with full symmetrical range of motion
39:01
compared to the uninjured side is actually quite
39:04
rare, even with optimal treatment. What sort
39:06
of range is typical? Sources consistently cite
39:09
average functional arcs of motion after surgery,
39:12
typically around 110 to 115 degrees of combined
39:15
flexion and extension. Often there's some degree
39:17
of flexion contracture, a loss of full extension,
39:20
maybe 10, 15, even 20 degrees, that persists.
39:23
While not fully normal, this range of motion
39:25
is usually sufficient for most activities of
39:27
daily living. So it sounds like aiming for a
39:29
highly functional elbow rather than a perfectly
39:32
normal one is the realistic goal. That's often
39:34
the case, yes. Maximizing function within the
39:37
limits imposed by the injury. The source has
39:39
also suggested that where you receive care might
39:42
matter, the experience level. Yes, that was noted.
39:45
Some sources, including the one from Mayo Clinic,
39:48
have reported better outcomes in these highly
39:50
complex cases when managed at higher volume centers
39:54
by surgeons who have significant experience specifically
39:57
in complex elbow trauma and reconstruction. It
40:00
makes sense. The technical demands of these surgeries,
40:03
the nuances of fixation, implant choice, ligament
40:07
repair, and the careful orchestration of postoperative
40:10
management likely benefit from that focused experience.
40:14
That was a truly deep dive into a remarkably
40:17
challenging injury. Let's try and consolidate
40:19
some key facts with our lightning round. Quick
40:22
questions, sharp answers based purely on the
40:24
sources we've explored today. Ready? Ready when
40:26
you are. Okay. What are the three essential structural
40:30
components defining a terrible triad injury?
40:32
That's the posterior elbow dislocation, the radial
40:35
head or neck fracture, and the coronoid process
40:38
fracture. Which classification system for cornoid
40:41
fractures is generally considered most useful
40:43
for guiding surgical planning, and why? That
40:46
would be the odriscal classification, because
40:48
it's based on the anatomical location, the tip,
40:51
antiremedial facet, or base, which directly dictates
40:54
the surgical approach and the fixation strategy
40:56
needed. For a severely comminuted, irreparable
41:00
radial head fracture in a terrible triad, what
41:03
is the usual surgical treatment? Radial head
41:05
arthroplasty, so replacement of the radial head
41:08
with an implant. What forearm position is often
41:11
recommended during LCL repair if the MCL is intact
41:14
and what's the reasoning? Pronation is often
41:17
recommended because pronation tensions the LCL
41:19
and helps to reduce that tendency towards poster
41:22
lateral rotation. What is the most common major
41:24
complication encountered after surgical fixation
41:27
of a terrible triad injury? Stiffness. or loss
41:30
of motion, often due to scar tissue, capsular
41:32
contracture, or sometimes heterotopic ossification.
41:35
And what specific type of imaging is considered
41:37
essential beyond plain x -rays for effective
41:40
surgical planning? Computed tomography, the CT
41:42
scan, especially valuable with 3D reconstruction
41:46
views. Excellent. Those cover the core factual
41:48
anchors from our comprehensive sources. To try
41:51
and summarize this very complex topic into practical
41:54
takeaways for you, our listener, here are five
41:57
key points from this deep dive into terrible
41:59
triad entries. First. Always maintain a high
42:03
index of suspicion for a terrible triad following
42:05
any elbow dislocation. It's a specific and severe
42:09
pattern. Don't underestimate it. Crucial first
42:11
step. Second, detailed imaging, particularly
42:13
a CT scan, often with 3D reconstruction, is vital
42:17
for accurately characterizing the complex bony
42:20
injuries and planning the appropriate surgical
42:23
intervention. Can't plan without the full picture.
42:25
Third. Surgical treatment is necessary in nearly
42:27
all cases. The main goal is to restore stability,
42:31
fixing both bone and ligaments reliably enough
42:33
to allow immediate, protected early range of
42:35
motion. Stability for motion is key. Fourth,
42:38
timely surgical management, ideally within about
42:40
14 days of the injury, combined with a rigorous
42:43
early post -operative rehabilitation program
42:46
focused on controlled motion, are absolutely
42:48
critical for optimizing recovery and minimizing
42:51
that dreaded complication of stiffness. Timing
42:53
and rehab are paramount. And fifth, given the
42:56
intricate nature of these injuries and their
42:58
demanding management, seeking care from orthopedic
43:01
surgeons or centers with specific experience
43:04
in complex elbow trauma can significantly influence
43:07
the potential outcomes. Experience likely matters
43:10
here. That brings us towards the close of this
43:13
deep dive into the terrible triad. If you found
43:16
this discussion valuable and insightful, please
43:18
do consider rating and sharing the show on LinkedIn
43:21
or X. And thank you immensely for guiding us
43:24
through this really challenging orthopedic topic
43:27
with such clarity and detail. It was my pleasure.
43:30
A fascinating and important injury to discuss.
43:32
As we conclude, here's a final thought for you
43:34
to reflect on, drawing directly from the sources
43:36
we've explored. Despite considerable advances
43:39
in our understanding and techniques, the management
43:42
of terrible triad injuries remains a profound
43:45
balancing act. It truly does. It's a continuous
43:47
effort by the surgical and therapy teams to achieve
43:50
just enough stability to prevent re -dislocation
43:53
and allow healing, while simultaneously allowing
43:56
enough early motion to regain functional use
43:58
and fight off stiffness. The patient's entire
44:01
journey involves navigating this fine line, where
44:04
the ultimate outcome really hinges on the success
44:06
of both the initial surgical reconstruction and
44:09
their dedicated long -term rehabilitation. A
44:11
partnership between surgeon, therapist, and patient.
44:14
Until next time, keep diving deep.