Which ROM deficit is greatest in glenohumeral joint osteoarthritis?

Which ROM deficit is greatest in glenohumeral joint osteoarthritis?

• A. Passive external rotation with arm at the side
• B. Forward flexion
• C. Abduction
• D. Internal rotation

Answer: (A)

Glenohumeral osteoarthritis stiffens the joint and creates a mechanical block from degenerative changes and capsular contraction. External rotation with the arm at the side isolates the glenohumeral joint and relies most on the joint’s pure rotational arc. In OA, osteophytes and posterior capsule tightness preferentially limit this rotation, producing the largest loss of motion in that position. Flexion and abduction can be partially preserved or aided by scapulothoracic motion, and internal rotation is often less restricted early on, so the greatest deficit shows up with passive external rotation from a neutral, adducted position.

Glenohumeral osteoarthritis stiffens the joint and creates a mechanical block from degenerative changes and capsular contraction. External rotation with the arm at the side isolates the glenohumeral joint and relies most on the joint’s pure rotational arc. In OA, osteophytes and posterior capsule tightness preferentially limit this rotation, producing the largest loss of motion in that position. Flexion and abduction can be partially preserved or aided by scapulothoracic motion, and internal rotation is often less restricted early on, so the greatest deficit shows up with passive external rotation from a neutral, adducted position.