Effect of surgical approach to hip arthroplasty on postoperative pain and mobilization and on efficacy of intrathecal oxytocin for pain.

Objective: Compare the effect of posterior surgical approach (PA) vs direct anterior approach (DAA) on speed of recovery from pain and dysfunction and on intrathecal oxytocin analgesia after total hip arthroplasty (THA).

Study Design: Nested cohort within a randomized, controlled, double-blind trial.

Setting: Hospital.