Forefoot pathology in relation to plantar pressure distribution in patients with rheumatoid arthritis: A cross-sectional study in the Amsterdam Foot cohort |
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| Institution: | 1. Amsterdam Rehabilitation Research Center, Reade, Dr. Jan van Breemenstraat 2, PO 58271, 1040 HG, Amsterdam, the Netherlands;2. VU University Medical Center, Department of Rehabilitation Medicine, PO 7057, 1007 MB, Amsterdam, the Netherlands;3. Amsterdam Public Health research institute, VU University Medical Center, Van der Boechorststraat 7, 1081 BT, Amsterdam, the Netherlands;4. Department of Epidemiology and Biostatistics, VU University Medical Center, De Boelelaan 1089a, 1081 HV Amsterdam, the Netherlands;1. Facultad de Enfermería y Podología, Universidad de Valencia, C/Jaume Roig s/n, 46010, Valencia, Spain;2. Departamento de Ingeniería Mecánica y Construcción, Universitat Jaume I, Av. Vicent Sos Baynat, s/n, 12071, Castellón, Spain;1. Institute for Biomechanics, ETH Zürich, Switzerland;2. Zurich Bone and Joint Institute, Switzerland;3. Schulthess Klinik Zürich, Switzerland;1. Graduate Program in Rehabilitation and Functional Performance, Ribeirão Preto Medical School, University of São Paulo, Brazil;2. College of Kinesiology, University of Saskatchewan, Canada;3. School of Physical Education and Sport of Ribeirão Preto, University of São Paulo, Brazil;1. Univeristy of Southern California, Los Angeles, California, United States;2. Children’s Hospital Los Angeles, Los Angeles, California, United States |
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| Abstract: | BackgroundIn patients with rheumatoid arthritis (RA), both high and low forefoot plantar pressures have been reported. Better understanding of pathology in the forefoot associated with altered pressure distribution in patients with RA could help to better formulate and specify goals for treatment with foot orthoses or therapeutic footwear.ObjectivesTo investigate the association of plantar pressure with disease activity and deformity in the forefoot in patients with rheumatoid arthritis and forefoot symptoms.MethodsA cross sectional study, using data of 172 patients with rheumatoid arthritis and forefoot symptoms, was conducted. Peak pressure (PP) and pressure time integral (PTI) in the forefoot were measured with a pressure platform. Forefoot deformity was assessed using the Platto score. Forefoot disease activity was defined as swelling and/or pain assessed by palpation of the metatarsophalangeal joints. The forefoot was divided in a medial, central and lateral region, in which the following conditions could be present: 1) no pathology, 2) disease activity, 3) deformity or 4) disease activity and deformity. A multilevel analysis was performed using condition per forefoot region as independent variable and PP or PTI in the corresponding region as dependent variable.ResultsStatistically significant higher plantar pressures were found in forefoot regions with deformities (RR 1.2, CI 1.1-1.3, P<0.0001), compared to forefoot regions without forefoot pathology. No significant differences in plantar pressures were found when solely forefoot disease activity was present in forefoot regions.SignificanceForefoot deformities are related to higher plantar pressures measured in the corresponding forefoot regions. The absence of an association between local disease activity and plantar pressure might be explained by the low prevalence of metatarsophalangeal joint pain or swelling. Future research with sensitive imaging measures to detect disease activity is recommended to reveal the effect of forefoot disease activity on plantar pressure. |
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| Keywords: | Rheumatoid arthritis Foot Plantar pressure Disease activity Deformity |
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