STEPPED AWKWARDLY OFF LADDER- TWISTED. REPORTED TO SUPERVISOR NEXT DAY, KNEE SWOLLEN. WENT TO DOCTOR ON 7/12 - TOLD TO ICE KNEE FOR SWELLING. SEEN AGAIN ON 7/19- NO APPARENT CHANGE- SEEN AGAIN ON 8/2- CONTINUED TO WORK. ON 8/2 DETERMINED ARTHROSCOPIC SURGERY NEEDED TO DETERMINE PROBLEM. ARTHROSCOPIC SURGERY ON 8/7/02. NO MISSED WORK UNTIL 8/7/02.