To improve lateral rotation of a shoulder with limited mobility, which joint glide is typically used?

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Multiple Choice

To improve lateral rotation of a shoulder with limited mobility, which joint glide is typically used?

Explanation:
Focusing on how the glenohumeral joint moves helps explain this. The head of the humerus is convex and the glenoid fossa is concave. When you want to increase external (lateral) rotation, the humeral head needs to roll in a posterior direction within the glenoid. Because the moving surface is convex on a concave surface, the accompanying accessory glide occurs in the opposite direction of the roll. Therefore an anterior glide of the humeral head on the glenoid fossa facilitates the posterior roll needed for external rotation, helping to improve this motion.

Focusing on how the glenohumeral joint moves helps explain this. The head of the humerus is convex and the glenoid fossa is concave. When you want to increase external (lateral) rotation, the humeral head needs to roll in a posterior direction within the glenoid. Because the moving surface is convex on a concave surface, the accompanying accessory glide occurs in the opposite direction of the roll. Therefore an anterior glide of the humeral head on the glenoid fossa facilitates the posterior roll needed for external rotation, helping to improve this motion.

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