Fig. 1
Case presentation of synchronous cementless bilateral total hip arthroplasty for osseous ankylosed hips with ankylosing spondylitis a: A man was diagnosed with ankylosing spondylitis and showed bilateral osseous ankylosed hips preoperatively. b: The radiograph of the pelvis after surgery immediately showed similar inclination of cup and femoral off-set as well as small leg-length discrepancy c: The radiograph of the pelvis at 100-month follow-up showed no aseptic loosening and migration of the component