AT THE TIME OF THE INCIDENT EE WAS WALKING AROUND AN OFF-HWY TRUCK, INSPECTING THE AREA IN PREP.OF BACKING THE TRUCK OUT OF THE WASHBAY. DURING THE WALKAROUND, HE FOUND A FIRE HOSE LAYING ON THE FLOOR IN THE PATH OF THE TRUCK. EE WAS USING THE INSIDE OF HIS RIGHT FOOT TO PUSH THE HOSE OUT OF THE WAY, HE FELT HIS RT. KNEE SLIP OUT OF PLACE AND THEN BACK INTO PLACE.