THE EMPLOYEE WAS RIDING IN THE SERVICE TRUCK, GOING TO HIS BLADE TO TAKE IT TO THE SHOP. AS HE STEPPED OUT OF THE TRUCK HIS FOOT SLIPPED ON THE STEP AND HE LOST HIS BALANCE AND FELL TO THE GRO UND. HE TWISTED HIS KNEE AS HE FELL. HE WAS TAKEN TO THE ER FOR EVALUATION AND TREATMENT AND PLACED ON RESTRICTED DUTY.