A randomised controlled trial of ultrasound-guided blockade of the saphenous nerve and the posterior branch of the obturator nerve for postoperative analgesia after day-case knee arthroscopy. - Westergaard, B.; Jensen, K.; Lenz, K.; Bendtsen, T. F.; Vazin, M.; Tanggaard, K.; Worm, B. S.; Krogsgaard, M.; Børglum, J. (Anaesthesia, 2014)