Rotator cuff gap

The intermuscular space between the lateral coracoid process, the subscapularis muscle, and the superior ganglia muscle is called the rotator interval. Post described the anatomy in 1978. There is loose connective tissue in the gap, which connects the superior ganglia muscle and the subscapular muscle, and there is a coracoid ligament in front of the gap to strengthen it. De Palma (1973) found that 9% of the normal people had open rotator cuff gaps. Rowe (1981) reported that in 37 patients with recurrent shoulder subluxation, 20 rotator cuff spaces were open, and the two were considered to be significantly related. The rotator cuff gap is more common in young adults, and the age of onset is 20 to 40 years. Tear of the rotator interval is a longitudinal tear of the rotator cuff tissue along the direction of the tendon fibers. Compared with general rotator cuff injuries, the etiology, pathology and prognosis have different characteristics. The rotator cuff gap is a weak part of the rotator cuff structure. Once division occurs, the combined force of the superior scapulae and subscapularis muscles in the upper arm lifting process weakens, and the fixing force of the humeral head on the scapula decreases, which is prone to the glenohumeral joint. Relaxation and slippage. The glenohumeral joint instability can also cause inflammation and adhesion of the scapular descending sac, which can further cause joint contracture.