Total hip arthroplasty in fused hips with spine stiffness in ankylosing spondylitis

Figure 6 Spinopelvic mobility in a 51-year-old male with flexion deformity and inability to sit comfortably prior to total hip arthroplasty, pre op and 29 mo post bilateral total hip arthroplasty ankylosing spondylitis. A: Pre op sacral slope (SS) standing; B: Post total hip arthroplasty SS standing; C: Sitting SS > 30 degrees sitting and standing demonstrates the stuck standing pattern. SS: Sacral slope.