Traumatic Tears of the Subscapularis Tendon

Abstract

The study population consisted of 14 shoulders in 13 consecutive patients with surgically confirmed isolated subscapularis tendon tears. In all but three patients, the mechanism of injury was traumatic hyperextension or external rotation of the abducted arm. All patients reported pain and weakness in the affected shoulder. Physical findings revealed limited passive range of motion at maximal internal and external rotation due to pain, weakness of internal rotation of the shoulder, and tenderness in the region of the intertubercular groove. However, these findings did not conclusively point to the subscapularis tendon as the site of injury. Preop erative interpretation of magnetic resonance imaging studies was used to diagnose tears of the subscapu laris tendon in 14 shoulders and biceps tendon sublux ation or dislocation in 6 shoulders. On arthroscopic examination, one patient was found to have a partial- thickness tear that was treated with arthroscopic de bridement. Six shoulders had full-thickness tears of the subscapularis tendon, and seven shoulders had full- thickness tears associated with concomitant biceps tendon pathologic conditions, including subluxation, dislocation, or rupture. The full-thickness subscapu laris tendon tears were repaired via an open anterior approach to the shoulder through the deltopectoral groove. Associated biceps tendon injuries were treated with tenodesis of the tendon to the intertubercular groove. Our early followup results have shown that, with proper diagnoses and surgical treatments, pa tients have greatly decreased pain and marked im provement in shoulder function.