METHODS	The primary outcome measures were pain , measured with a visual analog scale ( VAS ) , and knee range of motion ( ROM ) on days 8 and 15 postoperatively ; time required for patients to discontinue the use of crutches ; time to return to light activities and moderate sporting activities such as jogging ; and serum creatine phosphokinase ( CPK ) levels monitored preoperatively and on days 1 , 8 , and 15 postoperatively .\