The purpose of this study was to compare the findings of CT arthrography (CTA) with arthroscopic findings in recurrent anterior instability of the shoulder. In 26 patients, preoperative CTAs and arthroscopy (A/S) were performed. Attachment of the anterior joint capsule in the normal side were classified into 3 types : attachment to the labrum (15 shoulders), to under the labrum (7), to the base of the glenoid (4). It was difficult to define the labrums of Bankart's lesion by CTA. It was interesting that 7 patients had an attachment to under their labrum in their normal sides, 5 of them had a labrum adhesion to the glenoid necks on A/S.
