Intrinsic foot muscle size and associations with strength, pain and foot-related disability in people with midfoot osteoarthritis
Date
2023
Authors
Gong, Q.
Halstead, J.
Keenan, A.M.
Milanese, S.
Redmond, A.C.
Arnold, J.B.
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Journal article
Citation
Clinical Biomechanics, 2023; 101(article no. 105865):105865-1-105865-8
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Qun Gong, Jill Halstead, Anne-Maree Keenan, Steve Milanese, Anthony C. Redmond, John B. Arnold
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Abstract
Background To compare intrinsic foot muscle size between people with and without symptomatic midfoot osteoarthritis, and examine the association between muscle size and strength, pain and foot-related disability. Methods Twenty-three participants with symptomatic midfoot osteoarthritis and 23 age, sex and BMI matched controls were included. Intrinsic foot muscle cross-sectional area was measured using MRI. Hand-held dynamometry was used to assess foot and ankle muscle strength, and foot-related pain and disability was measured using Manchester Foot Pain & Disability Index. Findings Small and non-statistically significant differences were found in intrinsic foot muscle cross-sectional area between the two groups (effect sizes 0.15–0.26, p > 0.05). Muscle strength was reduced in the midfoot osteoarthritis group, with differences of 12–33% (effect sizes 0.47–1.2). In the control group, moderate positive associations) existed between foot muscle cross-sectional area and lesser digits flexor strength (r = 0.5 to 0.7, p < 0.05). Conversely, in the midfoot osteoarthritis group, negligible positive associations were found (r < 0.3, p > 0.05). Associations between foot muscle cross-sectional with and pain and disability scores in the midfoot osteoarthritis group were negligible (r < −0.3, p > 0.05). Interpretation Despite reductions in maximal isometric muscle strength, midfoot osteoarthritis does not appear to be associated with reduced intrinsic foot muscle cross-sectional area measured by MRI. Muscle compositional or neural factors may explain the reductions in muscle strength and variation in symptoms in people with midfoot osteoarthritis and should be investigated.
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Data source: supplementary data, https://doi.org/10.1016/j.clinbiomech.2022.105865
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