 Study Treatment Group 1 - Saphenous nerve block using ultrasound guidance The needle will be placed with the needle tip in close proximity 1-2 mm of the target structures the saphenous nerve if visible or in the subsartorial facial plane of the sartorius muscle if the nerve is not visible. A total of 10 mL of 0.5 ropivacaine will be used for the block. Before injection of any local anesthetic a gentle aspiration will be preformed, with a second aspiration after 5 mL of ropivacaine has been injected. Once injection of local anesthetic has commenced small needle adjustments are allowed to enhance spread. This will be done at the discretion of the regional anesthesiologist performing the block. 