反復性肩関節前方脱臼に対するＢｒｉｓｔｏｗ変法術後の筋力評価

Abstract

Modified Bristow's procedure is a satisfactory operation for recurrent anterior dislocation of the shoulder. However it restricts external rotation and there is a probability of weakness of the internal rotator muscle strength postoperatively. This report analyzed the influence of modified Bristow's procedure on muscular strength on the shoulder post-operatively.Twenty patients (13 male, 7 female) were evaluated postoperatively. Out of 13 males, 8 cases were operated on the non-dominant side and 5 cases were operated on the dominant side. All 7 females were operated on the dominant side. Age at the final examination ranged from 15 to 48 years with an average of 29.1 years. The average follow-up period was 63 months (range, 10 to 176 months). As a control group, 19 normal individuals were also examined.Using CYBEX 340, we examined internal and external rotator muscle strength at 90° abduction (the angular testing velocity was 60deg./sec, 120deg./sec. and 180deg./sec.), adductor and dbductor muscle strength (60deg./sec, 180deg./sec. and 240deg./sec.).In normal cases, no statistical differences in the peak torque and endurance between the dominant and non-dominant side were noted. In operated cases, there was no statistical difference in the peak torque and endurance between the sound side and the involved side.These results show that modified Bristow procedure does not decrease the muscular strength on the shoulder postoperatively.