Slide 1 of 39
SLIDE 1 OF 39
Classic anterior dislocation mechanism: arm abducted 90° + maximally externally rotated, then struck
Welcome to the Musculoskeletal Medicine Series. Picture a 19-year-old quarterback. He drops back in the pocket, winds up for a deep pass,
arm cocked back when a linebacker hits him blindly from the side.
Oh, that's a brutal mechanism.
Right. His throwing arm is pinned at exactly 90 degrees of abduction, and it's rotated as far outward as it will physically go.
He feels a sickening pop. The arm goes completely dead. He ends up in the emergency department where they sedate him and reduce the joints.
Standard protocol.
Yeah. But two weeks later, he is back in your clinic terrified. He tells you that any time he reaches behind his head to grab something,
it feels like his shoulder's about to just slide right out again.
I mean, that single case is basically a compressed masterclass.
Exactly. The position of the arm at the moment of injury, the exam maneuver that reproduces his fear, the specific x-ray views that confirm what tore,
the goal of this deep dive is to unpack the entire shoulder for the boards.
It's so high yield.
We are going to look at the normal range of motion, the intricate web of stabilizers, the acromioclavicular joint,
and then tear it all down by exploring the two major clinical syndromes that will dominate your exam and your practice, instability and impingement.
It really is the perfect clinical vignette because it forces you to stop memorizing and start visualizing the underlying mechanics.
You know, you can't just know that the shoulder dislocated.
Right. You have to know exactly why it failed.
Exactly. Why the architecture failed in that specific split second.