Investigators will enroll subjects planned for primary THA and allocate them into receiving a QL block with either saline or ropivacaine. Primary outcome will be pain scores over the first 48 hours after surgery.
The quadratus lumborum (QL) block is a fascial plane block that has been described to provide analgesia from T7-L3 dermatomes. The investigators aim to evaluate the efficacy of QL blocks in patients undergoing primary total hip arthroplasty (THA).