Influence of foot orthoses on plantar pressures, foot pain and walking ability of rheumatoid arthritis patients-a randomised controlled study

Purpose. To compare the effectiveness of functional foot orthoses and unshaped (flat) orthotic material on plantar pressure redistribution, forefoot pain reduction and walking ability in rheumatoid arthritis (RA) patients. Methods. Forty patients with RA were randomised to receive unshaped material (UM) (n=20) or functional foot orthoses (n=20). Plantar pressure measurement was performed with an F-scan system. Foot pain was assessed by the pain subscale of the Foot Function Index. Walking ability was assessed by the 6-min walking test. Investigations were performed at baseline, 1 week after the patient received shoes with orthoses and 6 months later. Results. Plantar pressures were significantly higher at painful than at non-painful foot areas. No differences in plantar pressure redistribution were found between the groups. Notable reduction of pain and improvement of activity (walking ability) was observed in both groups. Foot pain has moderate impact on the walking ability of RA patients. Conclusions. The study showed no clear advantage of functional foot orthoses over UM.