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THE RELATIONSHIP BETWEEN MUSCLE STRENGTH AND MUSCLE ACTIVITY DURING WALKING WITH POST-JOINT REPLACEMENT FUNCTION FOR PATIENTS WITH END-STAGE KNEE OSTEOARTHRITIS

Date

2024-12-13

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Abstract

Data collected one-week before and one-year post-TKA on 107 participants included walking speed, muscle strength, and EMG activity. Variables examined were knee flexor and extensor muscle strength, and muscle activity patterns representing prolonged activity and overall activity of knee flexor and extensor muscles during walking. This secondary analysis used linear models to determine how much variance pre-TKA values and pre-post TKA changes of the selected variables could explain in post-TKA changes in walking speed, and multivariate models to determine what combination of variables explained the most variance in post-TKA walking speed change. Due to differences between sexes found in previous work assessing pre- and post-TKA biomechanics, this study also conducted a sex-separated analysis using the same statistical methods, to explore differences between male and female TKA recipients. Muscle activity patterns, particularly measures of prolonged activity of knee extensor muscles, explained significant variance in walking speed change for the Study Sample.

Description

This work supports that muscle activity patterns are an important target for TKA rehabilitation to improve walking speed as a measure of overall function. Findings indicate that features influencing post-TKA changes are sex-specific and support that future work should continue to conduct sex-separate analysis, including in the development of rehabilitation protocols. The targets identified in this work can be used in the development of TKA rehabilitation protocol to improve the outcomes of TKA surgery.

Keywords

Rehabilitation, Knee osteoarthritis, Surgery, Muscle activity, Mobility

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