Anatomical Changes in Normal Sacro-Iliac Joints during Childhood and Comparison with the Changes in Still's Disease

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Abstract
Six pairs of sacro-iliac joints from young patients without joint disease are described anatomically and related to their radiological appearance. These are contrasted with sacro-iliac joints from 2 patients with severe Still''s disease, the younger of whom (9 years) showed abnormality mainly of the right sacro-iliac joint with absence of joint space due to fusion of cartilage. This change may be due to immobilization. The older specimen (20 years) shows rheumatoid arthritis in both sacro-iliac joints, which is not apparent in the pelvic X-ray.