John Arnold1, Shylie Mackintosh2, Sara Jones3, Dominic Thewlis4. 1. Biomechanics and Neuromotor Laboratory, Exercise for Health and Human Performance Research Group, School of Health Sciences, University of South Australia, Adelaide, Australia. Electronic address: john.arnold@mymail.unisa.edu.au. 2. Sansom Institute for Health Research, University of South Australia, Adelaide, Australia; International Centre for Allied Health Evidence, School of Health Sciences, University of South Australia, Adelaide, Australia. 3. International Centre for Allied Health Evidence, School of Health Sciences, University of South Australia, Adelaide, Australia. 4. Biomechanics and Neuromotor Laboratory, Exercise for Health and Human Performance Research Group, School of Health Sciences, University of South Australia, Adelaide, Australia; Sansom Institute for Health Research, University of South Australia, Adelaide, Australia; Centre for Orthopaedic and Trauma Research, University of Adelaide, Adelaide, Australia.
Abstract
BACKGROUND: Footwear and insoles are used to reduce knee load in people with medial knee osteoarthritis (OA), despite a limited understanding of foot function in this group. The aim of this study was to investigate the differences in foot kinematics between adults with and without medial knee OA during barefoot walking. METHODS: Foot kinematics were measured during walking in 30 adults; 15 with medial knee OA (mean age was 67.0 with a standard deviation (SD) of 8.9 years; height was 1.66 with SD of 0.13 m; body mass was 84.2 with SD of 15.8 kg; BMI was 30.7 with SD of 6.2 kg/m(2); K-L grade 3: 5, grade 4: 10) and 15 aged and gender matched control participants with 12 motion analysis cameras using the IOR multi-segment foot model. Motion of the knee joint, hindfoot, midfoot, forefoot and hallux were compared between groups using clustered linear regression. RESULTS: The knee OA group displayed reduced coronal plane range of motion of the midfoot (mean 3.8° vs. 5.4°, effect size=1.1, p=0.023), indicating reduced midfoot mobility. There was also a reduced sagittal plane range of motion at the hallux in the knee OA group compared to the control group (mean 29.6° vs. 36.3°, effect size=1.2, p=0.008). No statistically significant differences in hindfoot or forefoot motion were observed. CONCLUSIONS: People with medial knee OA display altered foot function compared to healthy controls. As foot and knee function are related, it is possible that altered foot function in people with knee OA may influence the effects of footwear and insoles.
BACKGROUND: Footwear and insoles are used to reduce knee load in people with medial knee osteoarthritis (OA), despite a limited understanding of foot function in this group. The aim of this study was to investigate the differences in foot kinematics between adults with and without medial knee OA during barefoot walking. METHODS: Foot kinematics were measured during walking in 30 adults; 15 with medial knee OA (mean age was 67.0 with a standard deviation (SD) of 8.9 years; height was 1.66 with SD of 0.13 m; body mass was 84.2 with SD of 15.8 kg; BMI was 30.7 with SD of 6.2 kg/m(2); K-L grade 3: 5, grade 4: 10) and 15 aged and gender matched control participants with 12 motion analysis cameras using the IOR multi-segment foot model. Motion of the knee joint, hindfoot, midfoot, forefoot and hallux were compared between groups using clustered linear regression. RESULTS: The knee OA group displayed reduced coronal plane range of motion of the midfoot (mean 3.8° vs. 5.4°, effect size=1.1, p=0.023), indicating reduced midfoot mobility. There was also a reduced sagittal plane range of motion at the hallux in the knee OA group compared to the control group (mean 29.6° vs. 36.3°, effect size=1.2, p=0.008). No statistically significant differences in hindfoot or forefoot motion were observed. CONCLUSIONS:People with medial knee OA display altered foot function compared to healthy controls. As foot and knee function are related, it is possible that altered foot function in people with knee OA may influence the effects of footwear and insoles.
Authors: Glauko Dantas; Isabel C N Sacco; Ana F Dos Santos; Ricky Watari; Alessandra B Matias; Paula R M S Serrao; Henrique Pott-Junior; Tania F Salvini Journal: BMJ Open Date: 2020-09-25 Impact factor: 2.692