Mid-term results of bilateral synchronous total hip arthroplasty for bony ankylosis in patients with ankylosing spondylitis

Abstract Background Total hip arthroplasty (THA) for bony ankylosis is technically challenging in patients with ankylosing spondylitis (AS). This study aimed to determine the mid-term results of bilateral synchronous THA AS. Methods Nineteen cases AS who received were included this (17 males and 2 females, mean age 49.2 years). Disease duration was 5–38 years (mean 18 6 months). All cementless THA. Intraoperative blood loss, visual analog scale (VAS) score, complications assessed. Harris scores evaluated clinical effect. Results Patients followed up 62–98 months 82.5 VAS score decreased from 7.42 ± 0.92 2.42 0.83, improved 21.8 7.2 80.3 6.5, flexion-extension range 0 142.3 6.2°. One patient septum bronchiale had a fracture intraoperatively treated wire strapping. traction injury femoral nerve postoperatively recovered 1 year after operation. Loosening subsidence not observed all patients. Heterotopic bone formation noted 3 No such as joint dislocation, acute infection, deep vein thrombosis found. Conclusion Bilateral effective because it patients’ quality life satisfactory outcomes.