A PTA observes a patient performing active shoulder abductio…
A PTA observes a patient performing active shoulder abduction in sitting. As the arm elevates, the patient demonstrates early superior translation of the humeral head, causing discomfort. The supervising PT explains that during normal shoulder abduction, the rotator cuff helps center the humeral head by producing an inferior slide to counteract the upward pull of the deltoid. Which group of muscles is primarily responsible for generating this stabilizing inferior glide?