|
Year |
2002 |
|---|---|
|
Question Number |
221. |
|
Category |
Shoulder and Elbow |
Question
Which of the following structures is the primary restraint to inferior translation of the glenohumeral joint when the arm is adducted
1- Superior glenohumeral ligament
2- Inferior glenohumeral ligament
3- Middle glenohumeral ligament
4- Supraspinatus tendon
5- Long head of the biceps tendon
Figures
Answer (click for answer)
Preferred Response: 1
The primary restraint to inferior translation of the glenohumeral joint when the arm is in an adducted position is the superior glenohumeral ligament. It works in concert with the coracohumeral ligament. The inferior glenohumeral ligament is the primary stabilizer for anterior, posterior, and inferior instability in abduction. The middle glenohumeral ligament is a secondary stabilizer for inferior translation when the humerus is in adduction and it may have a role in preventing anterior instability at 45 degrees of abduction. The supraspinatus (as well as the other rotator cuff muscles), the long head of the biceps, and scapulothoracic motion account for the Dynamic restraint to glenohumeral translation.
Reference: Harryman DT II, Sidles JA, Harris, SL, Matsen FA III: The role of the rotator cuff interval capsule in passive motion and stability of the shoulder. JBJS Am 1992; 74:53-66.
Warner JJ, Deng XH, Warren RF, Torzilli PA: Static capsuloligamentous restraints to superior-inferior translation of the glenohumeral joint. Am J Sports Med 1992; 20:675-685.