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[Hemophilic osteoarthropathy with special reference to the elbow joint].

Hemophilia is a rare disorder, whereby recurrent bleedings into the joint can result in osteoarthropathy. Radiological changes consist of osteoporosis, enlargement of the epiphyses, irregularity of the subchondral bone surface, narrowing of the joint space, cysts, erosions, joint incongruence and joint deformity. The earlier and the more frequent bleedings have occurred that have not been treated adequately, the more of the changes mentioned above are present. In children, osteoarthropathy of the elbow is present in only about 50% of cases, and in the remaining cases the degree is mostly minimal or moderate. Differential diagnosis consists of juvenile rheumatoid arthritis in children, and rheumatoid arthritis and osteoarthritis in adults.