A
Glenoid bone loss exceeds 25%
B
Superior labrum is predominantly involved
C
Anterior labroligamentous complex is avulsed and displaced medially with an intact periosteal sleeve
D
Humeral head shows a large engaging posterolateral defect
Explanation:Correct Option: C. An ALPSA (Anterior Labroligamentous Periosteal Sleeve Avulsion) lesion involves the avulsion of the anterior labrum, which then rolls medially and inferiorly along the anterior glenoid neck. Critically, the anterior scapular periosteum remains intact (stripping rather than tearing), unlike a classic Bankart where the periosteum is ruptured. (Ref: Neviaser, Arthroscopy, 1993)