Forefoot plantar shear stress distribution in hallux valgus patients |
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| Authors: | Metin Yavuz Vincent J Hetherington Georgeanne Botek Gordon B Hirschman Lynn Bardsley Brian L Davis |
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| Institution: | 1. Vascular Biology Unit, Queensland Research Centre for Peripheral Vascular Disease, School of Medicine and Dentistry, James Cook University, Townsville, Australia;2. Movement Analysis Laboratory, Institute of Sports and Exercise Science, James Cook University, Townsville, Australia;3. Allied Health Research Collaborative, Metro North Hospital and Health Service, Queensland Health, Australia;4. School of Clinical Sciences, Queensland University of Technology, Brisbane, Australia;5. Department of Internal Medicine, The Townsville Hospital, Townsville, Queensland, Australia;6. School of Public Health and Tropical Medicine, James Cook University, Townsville, Queensland, Australia;7. Department of Vascular and Endovascular Surgery, The Townsville Hospital, Townsville, Queensland, Australia;1. Research, Development and Education, Sint Maartenskliniek, Nijmegen, The Netherlands;2. Department of Orthopaedics, Sint Maartenskliniek, Nijmegen, The Netherlands;3. Research Center for Movement Control and Neuroplasticity, Department of Biomedical Kinesiology, Katholieke Universiteit Leuven, Leuven, Belgium |
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| Abstract: | BackgroundHallux valgus is a common foot disorder often experienced with secondary callosities and metatarsalgia. Many factors including improper shoes might be responsible in the pathophysiology of the problem. Hallux valgus deformity has been shown to alter the biomechanics of the whole foot rather than affecting only the great toe. Due to changes in the biomechanical functioning of the first ray, other regions of the forefoot area have been shown to bear abnormal loads with increased vertical loading on medial, central and lateral forefoot regions. The purpose of this study was to investigate the pattern of forefoot plantar shear loading in hallux valgus patients and compare these results with those of control subjects.MethodsA total of 28 subjects were recruited for the study of which 14 were clinically diagnosed with hallux valgus. A custom built platform was used to collect peak pressure and shear data. A repeated measures analysis of variance was used to analyze the recorded data.FindingsAntero-posterior shear was significantly lower in the deformity group (p < 0.05). The lateral forefeet of the patients, however, experienced slightly higher shear loads (p > 0.05).InterpretationPropulsive shear force generation mechanism under the medial forefoot was impaired in the disorder group. In general, shear loading of the plantar feet shifted laterally. Previously hypothesized higher medio-lateral shear magnitudes under the hallux were not confirmed. |
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