PAIN AND DISABILITY IN PATIENTS WITH OSTEOARTHRITIS OF HIP OR KNEE - THE RELATIONSHIP WITH ARTICULAR, KINESIOLOGICAL, AND PSYCHOLOGICAL CHARACTERISTICS

Objective. To determine to what extent articular, kinesiological, and psychological factors each contribute to pain and disability in patien ts with osteoarthritis (OA), after controlling for other factors. Meth ods. Cross sectional study among 200 patients with OA of the hip or kn ee. Dependent variables include pain (visual analog scale), self-repor ted disability (questionnaire), and observed disability (performance o f standardized tasks). Independent variables include joint degeneratio n (radiographs), muscle strength (dynamometer), range of joint motion (goniometer), pain coping (behavioral and cognitive strategies), and p sychological well being (depression, anxiety, cheerfulness). Multiple regression analysis was used. Results. Pain was found to be associated with muscle weakness and pain coping (p < 0.05). Disability was assoc iated with muscle weakness, range of joint motion, pain, pain coping, and psychological well being (all p < 0.05). Both pain and disability were most strongly associated with kinesiological characteristics and pain coping. Conclusion. After controlling for the other characteristi cs, kinesiological and psychological characteristics in patients with OA are each associated with disability. The association with pain is l ess clear. Future research on mechanisms underlying these associations is warranted.