抄録
In throwing shoulder injuries, SLAP lesion type III is rarely seen. This time we have experienced surgical treatments for 3 cases of SLAP lesion type III in a throwing athlete, therefore we have reported them and discussed the occurrences of mechanism. We studied 3 cases out of 40 arthroscopic surgeries for throwing shoulder injuries from March 2000 to February 2003. In all the 3 cases the SLAP lesions type III were found by arthroscopic examination. All of the cases were male pitchers with inferior laxities in their shoulder joints. The ages at operation were from 20 to 25. In arthroscopic surgery for SLAP lesions only the labrum injury site was resected. All of cases had a complete come back, and the period required for coming back was on average 6.3months. The average JOA score had postoperatively improved to 96.7 points from the preoperative 78.8 points, and the average JSS shoulder sports score had postoperatively improved to 91.7 points from the preoperative 34.3 points. We assume that as the occurrence mechanism, SLAP type II had occurred first. We suppose that in a shoulder joint with natural laxity, superior glenohumeral ligament and middle glenohumeral ligament were translated distally. Therefore, the laxity of the shoulder joint increased and in that situation, the injured labrum was pinched between the superior glenoid by the humeral head through pitching actions, and as a result the lesion gradually changed into type III.
