Fig. 2

Case presentation of sequential 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 before contralateral THA showed excellent prosthesis position and size of firstly performed THA. c: The film of the pelvis at 97-month follow-up showed superior radiological parameter and good fixation of the prosthesis