Functional and clinical outcome with modified lateral approach total hip arthroplasty in stiff hips with ankylosing spondylitis

Figure 2 Preoperative assessment and immediate postoperative assessment of hips. A: Eighteen-year-old male with 4 year history of progressive stiffness presented with bony ankylosis and flexion deformity of 25 degrees in the right hip; B: Four years postoperative bilateral simultaneous total hip arthroplasty. Brooker grade 2 heterotopic ossification left hip, flexion 90 degrees bilateral, Harris hip score 88, flexion 90 degrees, 12-item short form health survey physical component summary 39.83, and mental component summary 58.36; C: Forty-six-year-old male bilateral hip progressive stiffness for more than 10 years, flexion deformity 30 degrees bilateral with 20 degrees further range of movement in flexion; D: Two-year-postoperative bilateral simultaneous total hip arthroplasty, flexion 100 degrees right, 90 degrees left, Harris hip score 95, 12-item short form health survey physical component summary 52.88, and mental component summary 56.12.