Fig. 3From: Mid-term results of bilateral synchronous total hip arthroplasty for bony ankylosis in patients with ankylosing spondylitisa, b Three-dimensional reconstruction showing AS with hip flexion ankylosis and kyphosis deformity. c The radiographs showing bilateral bony ankylosis with 0° range of motion. d Postoperative radiograph of the patient 5 years after cementless THABack to article page