We designed a new arthroscopic classification for Bankart lesions, and compared the arthroscopic findings with a group of initial dislocations (Group ID) and that of recurrent dislocations (Group RD) using this classification.67 shoulders in 65 patients were evaluated using arthroscopy. There were 22 shoulders in Group ID and 45 shoulders in Group RD. We classified Bankart lesions as follows: Type 1 had a well preserved AIGHL/labrum complex, AIGHL and MGHL. Type 2 had preserved AIGHL / labrum complex, and atrophic MGHL. Type 3 had a destroyed AIGHL / labrum complex and remained MGHL. Type 4 had a destroyed AIGHL /labrum complex and no MGHL. In addition, two subtypes were designed for each of Type 2,3 and 4. Type “a” had an atrophic AIGHL and Type “n” had a normal AIGHL.27.6% of Group RD had Type 1.31.8% of Group ID and 17.8% of Group RD had Type 2n.4.5% of Group ID and 20.0% of Group RD had Type 2a.27.6% of Group ID and none of Group ID and 26.7% of Group RD had Type 3n.4.5% of Group ID,2.2% of Group RD had Type 3a Neither Group had Type 4n.4.5% of Group ID,33.3% of Group RD had Type 4a. These suggest that, when the initial dislocation advances to a recurrent dislocation, the AIGHL / labrum complex is ruined in Type 1 and Type 2n, but the ligaments are ruined in Type 3.
