Abstract
The pattern of peripheral joint involvement in ankylosing spondylitis is described, based on a study of 25 consecutive patients with the disease. Radiographically evident joint abnormalities exclusive of the hip were noted in 48% of patients. If one excludes both hips and shoulders, the incidence is 32%. The most frequent joints involved were the shoulders, knees, hands and wrists. Features allowing differentiation from rheumatoid arthritis include asymmetry, lack of demineralization, smaller erosive changes, propensity for bony ankylosis, and peculiar marginal periostitis.
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