Pigmented villonodular synovitis of the hip. Study of 9 cases

Pigmented villonodular synovitis of the hip is a very rare condition. The authors report 9 cases out of a total of 139 cases of pigmented villonodular synovitis of joints observed at the Rizzoli Institute in the last 35 years. They describe the clinical, radiological and pathological aspects, and discuss the problems of differential diagnosis. In particular, they discuss the indications for surgery (total synovectomy or arthroprosthesis) and the post-operative regime.