Assessment of block function was made by checking for sensory changes to pain and temperature (using a blunt needle and ethyl chloride spray) in the distribution of the saphenous nerve at 20:00 on POD 0. A functioning adductor canal block with bupivacaine will last at least 8-12 hours. Thus all blocks,( i.e. both with and without a continuous infusion) were anticipated to still be effective at 20:00H on the day of surgery, as no blocks were performed before 10 AM. Decreased sensation in the extremity receiving the block compared with the unblocked one at the level of the medial malleolus was accepted as evidence of a functioning block.