Late separation of femoral head from bipolar acetabular assembly. Due to creep deformation of cup's inner bearing.
An evaluation of the acetabular cartilage was performed grossly and histologically in a patient who had a bipolar hemiarthroplasty, which had served satisfactorily for two years until the femoral prosthetic head separated from the acetabular assembly due to creep deformation of the inner bearing polyethylene cup. This study indicates that the double-bearing bipolar prosthesis does not necessarily have an advantage over the classic single-piece prosthesis in the prevention of acetabular cartilage wear.
Kim
Y H
YH
Department of Orthopaedic Surgery, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.
D000077:Acetabulum; D005271:Femur Head Necrosis / Q000601:surgery*; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D011183:Postoperative Complications / Q000209:etiology*; D011475:Prosthesis Failure; D012086:Reoperation