Effects of shock absorbing insoles on knee pain, functional mobility, and lower extremity biomechanics in persons with symptomatic knee osteoarthritis Public Deposited

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  • March 20, 2019
  • Foxworth, Judy L.
    • Affiliation: School of Medicine, Department of Allied Health Sciences, Curriculum in Human Movement Science
  • Osteoarthritis (OA) is a progressive, chronic disease causing pain, limited function, and decreased quality of life. Purpose: To investigate the effects of shock absorbing insoles (SAI) on knee pain, functional mobility and lower extremity biomechanics in persons with knee OA and to identify any modifiers of the effects of SAI on knee pain. Methods: Sixty community-dwelling seniors (age 63.9 ± 8.8 years) with knee OA and pain completed a demographic form, Western Ontario and McMaster University Osteoarthritis Index, Arthritis Self Efficacy Scale, and three walking tasks under two conditions: 1) with SAI placed inside the shoe and 2) shoes alone. The walking tasks were: 1) usual pace; 2) fast pace; 3) six minute walk test (6MWT). After each walking task, participants rated their knee pain. Participants also completed a three dimensional (3-D) gait analysis. Data Analysis: Separate one-way within subject repeated measures ANOVA's were used to compare outcome variables. An ANCOVA was used to determine if subject characteristics modified the effects of the SAI on knee pain during the 6MWT. Results: Participants reported significantly less pain after walking six minutes while wearing the SAI (26 ± 25.7 mm) as compared to shoes alone (31.4 ± 28 mm, F1,59 = 5.067, p = .028, ES = .079, 1-β=60). No significant differences in knee pain (with or without SAI) were found during the other walking conditions. From the 3-D gait analysis, there were no significant differences in the time to reach peak vertical ground reaction force (VGRF), peak VGRF, loading rate, peak knee flexor moment or average knee moment between the two conditions. No significant interactions were found between select physical characteristics and changes in knee pain during the 6MWT while wearing the SAI. Conclusion: The use of SAI appears to decrease knee pain in persons with knee OA when walking for sustained periods. Weight, knee OA severity, WOMAC score, hip-knee-ankle angle or ASES pain subscore do not appear to modify the effects of the SAI on knee pain during the 6MWT. Kinetic variables associated with an increase in shock absorption were not significantly different during the SAI condition.
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  • Padua, Darin A.
  • Open access

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