Rotator cuff stability vary according to their stiffness and the direction of the force they apply upon the joint. In addition to stabilizing the glenohumeral joint and controlling humeral head translation, the rotator cuff muscles also perform multiple functions, including abduction, internal rotation, and external rotation of the shoulder. The infraspinatus and subscapularis have significant roles in scapular plane shoulder abduction (scaption), generating forces that are two to three times greater than the force produced by the supraspinatus muscle. However, the supraspinatus is more effective for general shoulder abduction because of its moment arm. The anterior portion of the supraspinatus tendon is
Rotator cuff tear or arthritis. Superior labral anterior-posterior lesions produce pain similar to that of rotator cuff tears. Those most prone to failed rotator cuff syndrome are patients 65 years of age or older; and those with large, sustained tears. Smokers, diabetes sufferers, patients with muscle atrophy and/or fatty infiltration, and those who do not follow postoperative-care recommendations also are at greater risk. Doctors examine patients and conduct imaging tests to identify the causes of continued discomfort. Depending upon the diagnosis, several treatment alternatives are available. They include revision repair, nonanatomic repair, tendon transfer and arthroplasty. When possible, surgeons make tension-free repairs in