Hofstad, J. K., Winther, S. B., Rian, T., Foss, O. A., Husby, O. S., & Wik, T. S. (2015). Perioperative local infiltration anesthesia with ropivacaine has no effect on postoperative pain after total hip arthroplasty. Acta Orthopaedica, 86(6), 654–658. https://doi.org/10.3109/17453674.2015.1053775