Isokinetic Quadriceps and Hamstring Muscle Strength After Anterior Cruciate Ligament Reconstruction: Comparison Between Single-bundle and Double-bundle Reconstruction 前十字韌帶重建手術後股四頭肌和腿後肌羣(膕繩肌)的等速肌力︰單束和雙束前十字韌帶重建術之比較

AbstractIntroductionClinical studies have not yet proven whether single-bundle (SB) or double-bundle (DB) anterior cruciate ligament (ACL) reconstruction is superior. Nonetheless, quadriceps and hamstring muscle deficit is common after ACL reconstruction and it may affect the final outcome. The purpose of this study was to compare the isokinetic quadriceps and hamstring muscle strength after SB-ACL and DB-ACL reconstruction.Materials and methodsWe recruited 40 patients with ACL reconstruction (20 SB and 20 DB) by the same team of surgeons from 2006 to 2009. Demographic data of both groups were comparable. Lower extremity concentric isokinetic peak extension and flexion torques were assessed at angular velocities of 60°/second, 180°/second, and 300°/second preoperatively and at least 1 year postoperatively. Clinical evaluation was performed, including anterior stability with an arthrometer (model KT-1000), Lysholm score, Tegner activity score, single leg hop test, and International Knee Documentation Committee score. Data were analysed statistically.ResultsThe isokinetic quadriceps and hamstring peak torque values in both the SB and DB groups did not show any significant difference. The maximum displacement upon KT-1000 arthrometer measurement appeared lower in the DB group but the difference was not significant. The side-to-side percentage deficits in quadriceps and hamstring peak torque at postoperative assessment were comparable in both groups.ConclusionIsokinetic quadriceps and hamstring muscle strength after SB-ACL or DB-ACL reconstruction was comparable