THE EMPLOYEE WAS OPERATING SHUTTLE CAR PULLED UP ON FEEDER BELTS WAS OFF WENT TO GET OUT OF S/C & STEPPED OUT & WAS HUNG IN BETWEEN CONTROL LEVER & SEAT. EE FELL BACKWARDS CATCHING SELF BEFORE COMPLETELY FALLING TO GROUND PULLING LIGAMENTS & MUSCLE STRAIN TO RIGHT KNEE. THIS WAS REPORTED TO SAFETY DEPT ON 5-22-03.