[Arthroscopic treatment of an intra-articular tumor of the hip joint].

We present the clinical case of an 18-year-old woman who complained of acute hip pain. MRI showed an intra-articular tumor 4 cm in size with osteolysis (18 mm) on the distal region of the femoral head-neck junction. Focal pigmented villonodular synovitis infiltrating the bone was diagnosed. A complete resection of the tumor including the osteolytic area was done by an arthroscopic procedure. There was no sign of relapse after 8 months of follow-up, with no pain and complete function of the hip. Arthroscopic treatment has the advantage of minimal surgical trauma and good mid-term results for treating a focal lesion in selected cases.