COMPARATIVE STUDY
JOURNAL ARTICLE
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Comparison of knee extensor strength between limbs in individuals with bilateral total knee replacement.

OBJECTIVES: To determine and compare force production of the knee extensors between limbs after bilateral total knee arthroplasty (TKA).

DESIGN: Two repeated-measures designs (2 factors: limb, time) assessing for differences in strength between limbs over 3 times at 2 different testing speeds.

SETTING: Private and institutional practice.

PARTICIPANTS: Fourteen volunteers (6 men, 8 women; mean age +/- standard deviation, 74.57 +/- 5.5 y; height, 169.91 +/- 9.43 cm; weight, 76.42 +/- 9.85 kg) with bilateral TKA. Open-chain knee extensor strength was measured in both legs before surgery and 30 and 60 days after TKA at 60 degrees /s and 180 degrees /s.

INTERVENTION: Rehabilitation 3 times weekly for 8 weeks. Treatment consisted of gait, transfer training, stationary cycle work, and a progressive resistance-training program.

MAIN OUTCOME MEASURE: Peak torque measured isokinetically.

RESULTS: Limb by time interaction was not significant for either 60 degrees /s (F(2,26) =.75, P =.351) or 180 degrees /s (F(2,26) =.78, P =.393). A significant main effect of time was found at 60 degrees /s (F(2,26) = 14.22, P =.0001) and 180 degrees /s (F(2,26) = 10.47, P =.003).

CONCLUSIONS: During the first month after TKA, bilateral knee extensor force-production decreased significantly compared with preoperative force production.

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