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The radio-synoviorthesis with yttrium 90 in the knee-joint in rheumatoid arthritis was performed and controlled in 106 knees of patients with rheumatoid arthritis over a span of time between 6 and 49 months. The results are similar to those of other authors. As compared to synovectomy radio-synoviorthesis seems less successful as far as long-term results are concerned. As local treatment radio-synoviorthesis seems a good supplementory element in the therapeutic plan of rheumatoid arthritis. The indication to alternative procedures has to be considered carefully for each individual case and joint.

This is a report of a girl of 16 years of age who complained of pain in both legs after intensive competitive sports, the main event being the 800 m race. Radiologically visualised were periostal reactions and new periostal bone formations at the femur and lower leg. Diagnosis was extremely difficult due to generalised signs and symptoms, such as temperature, associated with inappetence and a "run-down" feeling, increase of alkaline phosphatase and liver enzyme levels and of the blood sedimentation rate. Differential diagnosis of heterotopic ossifications is dealt with in detail.