直接外傷のない膝関節内出血の6例

抄録

In 65 cases of the hemarthrosis of the knee during the last three years, 59 cases of which had a history a prior trauma with immediate hemarthrosis. In six cases, however, the occurrence of bleeding into the joint was not initiated by an incident of trauma noticeable to the patients. Clinical diagnosis of these six cases included; pigmented villonodular synovitis (one case), hemangioma (one case), idiopathic hemorrhage (two cases), vascular injury by torn meniscus (one case), perforation into the subchondral bone by torn meniscus (one case). Last case was interesting, because caltification of the popliteus muscle shown on radiograms indicated functional disturbance of that muscle which seems to protect the lateral meniscus from injury. Attension is called to the fact that some meniscal rupture could be a cause of the non-traumatic hemarthrosis.