抄録
Background: The purpose of this study is to determine a factor influencing the injury form of the Bankart lesion and the Hill-Sachs lesion in traumatic anterior instability cases.
Methods: 110 shoulders with traumatic anterior instability were included in this study. There were 83 men and 27 women, and the mean age was 25.3 years old (range 14 to 61 years). We evaluated their Bankart lesions and Hill-Sachs lesions using CT arthrography and classified them in the following two groups by injury form. For Bankart lesion, group B1 included 61 shoulders with only labrum lesion, group B2 included 49 shoulders with bony lesion. For Hill-Sachs lesion, group H1 included 49 shoulders with narrow cartilage lesion, group H2 included 61 shoulders with wide cartilage lesion. We investigated age, gender, dislocation form (dislocation / subluxation), dislocation frequency, general joint laxity (Beigton score), the presence of the rotator cuff insufficiency tear and unaffected side shoulder range of motion (ROM) between the two groups each.
Results: For the Bankart lesion, group B2 had significantly higher age, and ROM of each direction of flexion, abduction, external rotation and the horizontal extension was significantly smaller than group B1. For the Hill-Sachs lesion, group H2 had significantly higher age, and a significantly higher rate of cases of dislocation than group H1.
Discussion: This results suggests the possibility that the Bankart lesion and the Hill-Sachs lesion became severer as the elderly patients at initial dislocation.
