We investigated the relationship between impairment, as represented by limitation in range of movement and pain in the knee joint, and disability as measured by a series of activities of daily living in 123 patients with either rheumatoid arthritis or osteoarthrosis. A log-linear modelling technique found there was a positive association between functional limitation, as measured by reduction in angle of flexion, and disability. However, there was only a marginal relationship between pain in the knee joint and disability, and no association between pain and range of movement, which suggests that conventional beliefs that pain is a key factor in assessing health outcomes may need to be reassessed.
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