Which of the following best describes the structure of the glenohumeral (GH) joint?

a. The joint surfaces of the GH joint are naturally congruent and stable.
b. The glenoid labrum enhances the depth of the glenoid fossa.
c. The glenoid fossa, by itself, is three times larger than the humeral with which it articulates.
d. The glenoid labrum is a thin hyaline cartilage structure.

ANS: B
A general anatomy overview provides the answer to this question. The large humeral head is very incongruent with the shallow glenoid fossa. The dense fibrous glenoid labrum attaches to the periphery of the fossa, enhancing the depth of the fossa.