What is the most frequent direction of glenohumeral (GH) dislocation? What position of the humerus puts the joint at greatest risk for dislocation?
What will be an ideal response?
ANS:
Anterior between the superior and middle GH ligaments. Because of the orientation of the head and fossa, the most common dislocation of the humeral head occurs anteriorly. Bringing the humerus into abduction and external rotation puts the humeral head in a position where it can most readily be thrust forward through the capsule. Although the inferior axilla is least protected, inferior dislocations generally would occur from a force from above, an area protected by the coracoacromial arch. The posterior axilla is well protected by musculature. The anterior joint has neither bony protection nor the muscular mass of the posterior axilla. There is also a common area of marked weakness in the anterior joint capsule that will fail with sufficient imposition of force.
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What will be an ideal response?
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Fill in the blank(s) with the appropriate word(s).
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