Individuals with mild-to-moderate hip osteoarthritis walk with lower hip joint contact forces despite higher levels of muscle co-contraction compared to healthy individuals

Journal article


L.E. Diamond, H.X. Hoang, R.S. Barrett, A. Loureiro, M. Constantinou, D.G. Lloyd and C. Pizzolato. (2020). Individuals with mild-to-moderate hip osteoarthritis walk with lower hip joint contact forces despite higher levels of muscle co-contraction compared to healthy individuals. Osteoarthritis and Cartilage. 28(7), pp. 924-931. https://doi.org/10.1016/j.joca.2020.04.008
AuthorsL.E. Diamond, H.X. Hoang, R.S. Barrett, A. Loureiro, M. Constantinou, D.G. Lloyd and C. Pizzolato
Abstract

Objective
To compare hip joint contact forces (HJCF), hip muscle forces, and hip muscle co-contraction levels between individuals with mild-to-moderate hip osteoarthritis (OA) and healthy controls during walking.

Design
Eighteen participants with mild-to-moderate hip OA and 23 healthy controls walked at a self-selected speed while motion capture and electromyographic data were synchronously collected. HJCF were computed using a calibrated electromyography-informed neuromusculoskeletal model. Hip joint contact forces, muscle forces, and co-contraction indices for flexor/extensor and adductor/abductor muscle groups were compared between groups using independent sample t-tests (P < 0.05).

Results
There was no between-group difference in self-selected walking speed. On average, participants with hip OA walked with 11% lower first peak (mean difference 235 [95% confidence interval (CI) 57–413] N) and 22% lower second peak (mean difference 574 [95%CI 304–844] N) HJCF compared to controls. Hip muscle forces were also significantly lower in the hip OA compared to control group at first (mean difference 224 [95%CI 66–382] N) and second (mean difference 782 [95%CI 399–1164] N) peak HJCF. Participants with hip OA exhibited higher levels of hip muscle co-contraction in both flexor/extensor and adductor/abductor muscle groups. Consistent with existing literature, hip joint angles (extension, adduction) and external moments (flexion, extension, adduction) were lower in hip OA compared to controls.

Conclusion
Lower HJCF were detected in mild-to-moderate hip OA, primarily due to lower hip muscle force production, and despite higher levels of hip muscle co-contraction. Findings suggest that lower loading of the hip joint during walking is a feature of mild-to-moderate hip OA, which could have implications for the pathogenesis of hip OA and/or disease progression.

KeywordsHip joint; Electromyography; Neuromusculoskeletal modelling; Co-contraction
Year2020
JournalOsteoarthritis and Cartilage
Journal citation28 (7), pp. 924-931
PublisherElsevier Ltd
ISSN1522-9653
Digital Object Identifier (DOI)https://doi.org/10.1016/j.joca.2020.04.008
Scopus EID2-s2.0-85085021808
Publisher's version
File Access Level
Controlled
Publication process dates
Deposited16 Apr 2021
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