How would range and strength of abduction of the upper extremity be affected if there were paralysis of the infraspinatus, teres minor, and subscapularis muscles?
What will be an ideal response?
ANS:
One would lose synergy with the deltoid such that an active contraction of the deltoid would produce upward translation of the humeral head into the coracoacromial arch, rather than abduction. Because scapular motion would still occur, the net effect would be slightly greater than 60 ° of elevation. Full passive range of motion would be available at the glenohumeral (GH) joint.
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