Quadratus Lumborum Block Versus Control for Total Hip Arthroplasty

Under ultrasound guidance, the needle will be advanced to the posterior border of the quadratus lumborum muscle. After negative aspiration, a bolus of 40 mL of 0.25% bupivacaine with 1:400,000 epinephrine will be injected in 5 mL aliquots, ensuring proper placement of needle tip and appropriate spread of local anesthetic.

This is currently the standard of care, no local anesthetic will be injected. Pain will be managed with parenteral and oral medication.