Abstract
AbstractTo assess muscle strength after high tibial osteo¬tomy (HTO) using percutaneous drilling, we prospectively evaluated the isometric and isokinetic muscle torque of the thigh before operation and after operation over time. We evaluated 27 joints of 26 patients with a mean age of 66 years. The muscle torque/weight ratio was seen to decrease, and the hamstrings/quadriceps (H/Q) ratio increased at 3 months after HTO; both ratios showed no significant difference at 6 months. Improved muscle strength appeared at isometric extensor of 50°, not 80°, and at slow isokinetic speeds of 30°/s, not 90°/s. There was no significant difference in terms of the age of patients regarding the recovery of muscle strength. We also compared patients with a varus angle of >5° and those with a varus angle <5° before the operation. In terms of extension, the group with varus angles <5° showed a greater postoperative increase in isometric torque at 80° flexion of the knee and isokinetic torque at 90°/s than did the group with varus angles of >5°.
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