Most commonly due to anterior shoulder dislocation caused by hyperabduction and external rotation of the arm. Usually in young men who play contact sports (E.g. rugby, football, volleyball, basketball, etc.). Frequent anterior (frontward) subluxation also poses a great risk factor.
Humeral avulsion of the glenohumeral ligament
Ulnar collateral ligament injury of the elbow
Biceps tendon rupture
Rotator cuff tear
Biceps femoris tendon rupture
Postarthroscopic glenohumeral chondrolysis
Quadriceps tendon rupture
Medial epicondyle fracture of the humerus