Sixty-three healthy patients undergoing knee arthroscopy under local anesthesia ( LA ) were randomized to receive 1 of the following substances intra-articularly postoperatively : group B : 30 mL of bupivacaine ( 150 mg ) ; group R : 30 mL of ropivacaine ( 150 mg ) ; and group RMK : ropivacaine 150 mg , morphine 4 mg , and ketorolac 30 mg in normal saline ( total volume 30 mL ) .
