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BACKGROUND: Foot involvement occurs early in rheumatoid arthritis but the extent to which this impacts on the structure and function leading to impairment and foot related disability is unknown. The purpose of this study was to compare clinical disease activity, impairment, disability, and foot function in normal and early rheumatoid arthritis (RA) feet using standardised clinical measures and 3D gait analysis.
METHODS: Twelve RA patients with disease duration </=2 years and 12 able-bodied adults matched for age and sex underwent 3D gait analysis to measure foot function. Disease impact was measured using the Leeds Foot Impact Scale (LFIS) along with standard clinical measures of disease activity, pain and foot deformity. For this small sample, the mean differences between the groups and associated confidence intervals were calculated using the t distribution
RESULTS: Moderate-to-high foot impairment and related disability were detected amongst the RA patients. In comparison with age- and sex-matched controls, the patients with early RA walked slower (1.05m/s Vs 1.30m/s) and had a longer double-support phase (19.3% Vs 15.8%). In terminal stance, the heel rise angle was reduced in the patients in comparison with normal (-78.9degrees Vs -85.7degrees). Medial arch height was lower and peak eversion in stance greater in the RA patients. The peak ankle plantarflexion power profile was lower in the patients in comparison with the controls (3.4W/kg Vs 4.6W/kg). Pressure analysis indicated that the RA patients had a reduced lesser toe contact area (7.6cm2 Vs 8.1cm2), elevated peak forefoot pressure (672kPa Vs 553kPa) and a larger mid-foot contact area (24.6cm2 Vs 19.4cm2).
CONCLUSIONS: Analysis detected small but clinically important changes in foot function in a small cohort of RA patients with disease duration <2 years. These were accompanied by active joint disease and impairment and disability.
Such a debilitating condition when severe joint degredation occurs. I would be interested to know if anyone has had success with MBT footwear for helping with RA foot related pain.
Early effects of rheumatoid arthritis on foot function
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