Cementless total hip arthroplasty in ankylosing spondylitis

Objective To study the clinical efficacy and strategy of cementless total hip arthroplasty（THA） in patients with ankylosing spondylitis（AS）. Methods THA was performed for 58 hip-joint lesions due to AS in 38 patients.The patients were followed up for 26.6 months（range 20-45 months）.Pain,motion and function of hip-joints were compared before and after operation.The function of hip-joint was evaluated with the Harris scoring system. Results The symptoms and function of hip-joint were significantly improved in all patients after operation.The flexion,motion and score of hip-joint before operation were increased from 22.9° to 83.3°,36.5° to 139.3°,and from 38.7 to 87.2 after operation,respectively.X-ray examination showed no looseness and dislocation of the prosthesis. Conclusion Cementless THA is a valid procedure for hip-joint lesions due to AS.