Total hip arthroplasty for treatment of fused hip with 90 degrees flexion deformity

Conversion of a fused hip to total hip arthroplasty is a challenging procedure. The results depend on the degree of the change that occurs in the muscles and soft tissues at the hip from long immobilization, and considerable postoperative rehabilitation is necessary. Complications such as nerve injury, dislocation, infection and heterotopic ossification are common. Most of the authors recommended trochanteric osteotomy for better exposure. We are reporting a case of conversion total hip arthroplasty performed for a hip fused in 90 degrees of flexion. Surgical technique is described in detail and pertinent literature is reviewed.