Featured on Channel NewsAsia

Lesions and the Biomechanics of Instability-Bankart Lesions

For the humeral head to escape the glenoid fossa, the soft-tissue restraint must be disrupted. The location of the disruption depends on several factors such as the direction of the force applied to the shoulder; the position of the arm at the time of injury; and most importantly, the age of the patient.

In older patients the more common lesion is a tear of the rotator cuff, the “posterior mechanism” of dislocation, with or without labral pathology; however, in patients younger than age 40 years, the predominant finding is a tear of the anteroinferior labrum, a Bankart lesion.

Bankart lesions have been considered the primary and most common pathology leading to recurrent anterior dislocation. These lesions were originally described as injuries to the labrum corresponding to the detachment of the anchoring point of the IGHL and MGHLs from the glenoid rim. Taylor and Arciero reported the arthroscopic findings in 63 patients who sustained an initial anterior dislocation. All patients in the study were younger than 24 years of age.

Sixty-one of the 63 patients (93%) had an avulsion of the anteroinferior glenoid labrum (Bankart lesion) with no evidence of intracapsular injury. Fourteen of the 63 (22%) had an associated osseous lesion of the glenoid rim. In addition, there were six superior labral tears, two included the biceps origin. There were no full-thickness rotator cuff tears.

Comments are closed.