One of the possible atraumatic causes of recurring hemarthrosis of the knee is constituted by the association of a lesion of the lateral meniscus with severe gonarthrosis of the lateral compartment. In the case described we were able to determine the cause of frequent bleeding (12 times in 15 months) in a traction caused by the injured meniscal tissue on the terminal branches of the geniculated arteries in the area of the popliteal hiatus. Thus, this clinical manifestation cannot be attributed to a synovial pathology. Total arthroscopic meniscectomy solved the problem.
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