Abstract
Due to the protracted recovery time, the efficacy of total knee arthroplasty may be most reliably evaluated at one year and longer. The purpose of this study was to investigate long term knee extension strength following unilateral total knee arthroplasty (TKA). Forty patients (20 females& 20 males, age 72.3±5.2 yrs) performed three maximal concentric knee extension repetitions at an isokinetic speed of 60 degrees per second. Tests were performed at pre-op, 60 days and 1 yr post-operatively. The results(mean±SE) of each test are shown below. Significantly (p<0.05) less strength was demonstrated at pre-op, 60 days and one year when compared to the contralateral limb. Additionally, strength at 60 days was significantly less than one year. These results suggest that knee extension strength improves over the long term and remains weaker than the contralateral limb as late as one year post-op. Therefore, practitioners involved in assessing and training patients following unilateral total knee arthroplasty should be aware of their unique strength imbalances. Future research should further investigate the time course of strength recovery in this population in an effort to document limb strength equanimity. Figure
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