WHILE EXITING THE CAB OF VEHICLE, EMPLOYEE STEPPED FROM THE TOP STEP OF THE VEHICLE TO THE GROUND WITH HIS RIGHT FOOT. THE EMPLOYEE'S ANKLE TURNED WHEN HE CONTACTED THE GROUND AND HE ALSO TWI STED HIS RIGHT KNEE. THE EMPLOYEE WAS USING A 3POINT CONTACT SYSTEM WHILE EXITING HOWEVER, DID NOT UTILIZE THE STEP CLOSET TO THE GROUND. THE EMPLOYEE WAS INCOMPLIANCE WITH COMPANY AND MINE