Effect of a Realigning Brace on Tibiofemoral Contact Stress

Arthritis Care & Research
Neil A SegalDonald D Anderson

Abstract

To determine the degree to which focally elevated tibiofemoral joint contact stress is reduced by using a frontal plane realigning brace. Fifteen volunteers (9 women) with unicompartmental tibiofemoral osteoarthritis underwent weight-bearing radiographic imaging at 15-20° and 5-10° of knee flexion with and without an UnloaderOne knee brace. Discrete element analysis was used to estimate compartment-specific contact stress distributions. Paired t-tests were used to assess the differences in mean contact stress and contact stress distributions, comparing the braced and unbraced conditions. The mean ± SD age was 56.1 ± 6.4 years and body mass index was 28.4 ± 4.5 kg/m(2). Twelve of 15 participants were fit with braces set to unload the medial compartment. For the 15-20° condition, the mean contact stress in the compartment of interest did not significantly change (0.08 ± 0.35 MPa; P = 0.410). Also at 5-10° flexion, the mean contact stress in the compartment of interest did not significantly change with use of the brace (0.24 ± 0.45 MPa; P = 0.175). This is the first study of the effects of a frontal plane realignment brace on in vivo articular contact stress in native human knees. Using the off-the-shelf brace tested, there were n...Continue Reading

Associated Clinical Trials

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Citations

May 1, 2018·PM & R : the Journal of Injury, Function, and Rehabilitation·Kaitlin G RabeDonald D Anderson

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