2011 Volume 35 Issue 3 Pages 949-952
The purpose of this study was to evaluate shoulder muscle power recovery after arthroscopic labrum repair for type II SLAP lesion. Nineteen patients with type II SLAP lesion were evaluated for shoulder rotational muscle strength before and after arthroscopic labrum repair using suture anchors. The peak torque of both shoulders during isokinetic concentric muscle contraction was measured under the condition of 60, 180, 300 and 450 degrees/sec. using Biodex dynamometer at before and 3, 4.5, 6, 9, and 12 months after the surgery. The peak torque ratio was calculated. The peak torque ratio during external rotation was recovered to the preoperative level by 4.5 months, and returned to the contra-lateral level by 6 months. There was no difference of the peak torque recovery among the motion speed conditions. The peak torque ratio of internal rotation was recovered to the preoperative level by 3 months, and increased to the contra-lateral level by 4.5 months. The peak torque ratio in higher speed conditions was recovered earlier than that in lower speed conditions. The rotational muscle strength was rapidly recovered after arthroscopic labrum repair for SLAP lesion. The muscle strength recovery in external rotation was retarded compared to that in internal rotation. The muscle strength under the high speed conditions was considered to be reduced for athletes with throwing shoulder injury, however, our cases with SLAP lesion recovered well under the high speed conditions. They obtained sufficient muscle balance by 6 months, and could resume to the high-level throwing activity sports.
