Inclusion Criteria:  Primary unilateral osteoarthritis of the hip scheduled for total hip arthroplasty. Ability to understand and write swedish.  Exclusion Criteria:  Impaired funktion of the contralateral hip or knees causing limping. Neuromuscular diseases Postoperative leg length discrepancy excceding 1 cm Postoperative discrepancy in femoral offset exceeding 25% of the femoral offset of the contralateral hip.