[Total hip arthroplasty in patients with Psoriatic arthritis]. 
Objective: To evaluate the clinical efficacy of Total hip arthroplasty (THA) in treating the hip joint involvement of Psoriatic arthritis (PsA).  Methods: From January 2005 to December 2016, a total of 15 PsA patients (20 hip joints) underwent THA in Department of Orthopaedics, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College.  All the patients had obvious restriction in daily life before operation.  The mean Harris score was 25.2 averagely and the mean total range of the hip joint movement was 39.6° before surgery.  All the prosthesis were biotype and ceramic to ceramic.  Results: All patients were followed up with an average of 35.7 months and could take care of themselves.  The Harris score of hip joint was 83.2 averagely, including 15 hips excellent, 3 good, and 2 passable, with an excellent and good rate of 90%.  The mean total range of the hip joint movement was 175° after surgery.  There was no infection, nerve injury or loosening of the prosthesis.  1 hip appeared avulsion fracture of greater trochanter of femur, and the joint function was satisfying at the last time of follow-up.  Conclusion: THA is an effective method in treating affected hip joint of PsA. It can restore the hip function and improve the life quality of the PsA patients.