Bankart lesion repair: biomechanical and anatomical analysis of Mason-Allen and simple sutures in a swine model

Abstract

ObjectiveTo evaluate the labral height and pullout resistance after the repair of Bankart lesions in the glenohumeral joint of swine models, using double-loaded anchors with two suture configurations: simple and Mason-Allen. MethodsTen swine shoulders were used, in which Bankart lesions were created. For each specimen, the lesion was sutured randomly with Mason-Allen sutures or simple sutures. The labral height was measured before the lesion was created and after the labral repair. The specimens were submitted to a tensile test for biomechanical evaluation. ResultsIn specimens submitted to simple suture (n=5), the mean labral height observed before the lesion was 3.86mm, and after suturing, 3.33mm. In specimens submitted to Mason-Allen suture (n=5), it was observed that the mean labral height before the lesion was 3.92mm, and after suturing, 3.48mm. When comparing the labral height after simple suture and Mason-Allen suture, no significant difference was observed. The pullout force at the end of the tensile test on specimens with single suture was 130N, and in specimens with Mason-Allen suture, 128.6N. No statistically significant differences were observed between the shoulders treated with single suture and Mason-Allen suture; p=0.885. ConclusionsRepair of Bankart lesions with Mason-Allen suture provides increased labrum height; however, it does not increase the pullout strength.