Which muscle group contributes to compressive stability of the glenohumeral joint?

• A. Latissimus dorsi
• B. Deltoids
• C. Pectoralis major
• D. Trapezius

Answer: (B)

Stability at the shoulder joint comes from compressive forces that press the humeral head into the glenoid as you move. The deltoids, when they contract to lift the arm, also create a compressive effect on the humeral head against the socket, helping to keep the joint centered. The other muscles listed are more about producing movement or stabilizing the shoulder girdle rather than providing that inward compressive force at the joint itself. So, among these options, the deltoids best contribute to compressive stability of the glenohumeral joint.