RECURRENT DISLOCATION OF TOTAL HIP PROSTHESIS DONE IN ANKYLOSING SPONDYLITIS WITH SPINOPELVIC MALROTATION- A CASE REPORT

The purpose of this study was to evaluate the results of total hip arthroplasties with special regard to angle of cup position in patients with bilaterally ankylosed hips.thirty five year old male, an engineer was diagnosed to have ankylosing spondylitis with bilateral chronic arthritis hip,with sacroilitis. patient was treated with uncemented total hip arthroplasty. Postoperatively patient had recurrent dislocation of the prosthesis twice and we concluded that the altered pelvic biomechanics in ankylosing spondylitis inturn modifies the version and inclination of prosthetic component causing recurrent dislocation of hip.