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[Purpose] This study examined the relationship of both knees flexor muscles’ activities after harvesting the semitendinous tendon (ST) for anterior cruciate ligament (ACL) reconstruction. [Subjects] The subjects were 9 patients who underwent unilateral ACL reconstruction using an ipsilateral semitendinosus tendon 12 months earlier. [Methods] Isometric knee-flexion torque at 30, 60, 90 and 105 degrees/sec of knee flexion were measured of both lower extremities. We also measured the muscle activity at the same time. [Results] Subjects were divided into two groups based on the value of the lower extremities muscle strength. The two groups were the“recovery group” (recovery of more than 80% of the unreconstructed side), and the“norecovery group” (recovery of less than 80% of the unreconstructed side). The muscle electrical activity in the recovery group showed a decrease on the operated side and the norecovery group showed a decrease in both legs. [Conclusion] Donor muscle activity remained low even after a longtime had passed since reconstruction because of the influence of the tendon collection. Also, the results suggest that the operated side muscle hypoactivity caused healthy side ST muscle hypoactivity.

Knee Flexor Muscle Activity 12 Months after Harvesting the Semitendinous Tendon for Anterior Cruciate Ligament Reconstruction