EMPLOYEE WAS CARRYING TWO PELLET SAMPLE PAILS THAT WEIGH ABOUT 25 POUNDS EACH. WHEN WALKING UP A 2 STEP STAIRWAY HIS LEFT KNEE GAVE OUT. ORIGINALLY DIAGNOSED WITH A STRAIN. MRI REVEALED A TEAR OF THE MEDIAL MENISCUS. SURGERY ON 6/26/02. LOST TIME. RECEIVED MEDICAL REPORT ON 7/12/02.