[Synovial chondromatosis of the hip. Value of dislocation of the hip for complete removal of pathological synovial membranes].

Thirty-two synovial chondromatoses of the hip have been treated surgically. Nine cases were discovered accidentally in arthrotic hips being treated by total arthroplasty. Eleven partial joint clearances were made, five by an anterior approach and six by a lateral approach without dislocation of the hip, with bad results due to persistence of pathological synovium in the depth of the acetabular fossa. Twelve complete joint clearances were made with subtotal synovectomy and removal of all loose bodies, especially from the acetabular fossa, by dislocating the hip. The results were better and the prevention of secondary arthrosis and stabilisation of the hip condition was rendered more certain. Dislocation of the hip, with suitable precautions, does not cause avascular necrosis of the femoral head. Surgical treatment is indicated at an early stage in the disease and may prevent osteoarthrosis in a young subject.