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  • Title: Foot and ankle kinematics in rheumatoid arthritis: influence of foot and ankle joint and leg tendon pathologies.
    Author: Dubbeldam R, Baan H, Nene AV, Drossaers-Bakker KW, van de Laar MA, Hermens HJ, Buurke JH.
    Journal: Arthritis Care Res (Hoboken); 2013 Apr; 65(4):503-11. PubMed ID: 22972768.
    Abstract:
    OBJECTIVE: From early onset of the disease, patients with rheumatoid arthritis (RA) experience walking impairments. Pathologic effects of RA on foot and ankle structures have been studied clinically, but little is known as to how they relate to kinematic changes during gait. The aim of this study was to explore the relationship between clinically observed pathologies of foot and ankle joints and leg tendons and the corresponding gait kinematics. METHODS: The gait of 25 subjects with varying stages of RA was recorded and foot and ankle kinematics were assessed. Magnetic resonance imaging was performed for each subject: first metatarsophalangeal (MTP) joint, midfoot, and hindfoot synovitis, erosion scores, and leg tendon involvement were determined. The joint alignment and motion score represented daily clinical assessment. The 95% confidence intervals of the Spearman's correlation coefficient tests were used to explore the relationships between the clinical and kinematic parameters. RESULTS: Maximum first MTP joint dorsiflexion at preswing was related to reduced first MTP joint passive motion, first MTP joint synovitis and erosion, midfoot synovitis and erosion, and hindfoot erosion. Midfoot pronation range of motion during single stance was related to subtalar alignment and Achilles tendon involvement. Hindfoot eversion range of motion during single stance was related to subtalar alignment and peroneus longus tendon involvement. Involvement of the tibialis posterior tendon could not be identified as an independent factor influencing foot or ankle kinematics. CONCLUSION: Our findings suggest moderate to strong relationships between foot and ankle gait kinematics and structural pathologies.
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