EMPLOYEE'S KNEE LOCKED UP WHEN HE ATTAMPTED TO EXIT VEHICLE, AGGRAVATING PRE-EXISTING ARTHRITIC CONDITION. EE DID NOT SEEK MEDICAL ATTENTION, NOR DID HE MISS WORK UNTIL 8/25 AT WHICH TIME HE WAS TOLD TO STAY AWAY FROM WORK UNTIL FURTHER NOTICE.**DIAGNOSIS PER MEDICAL - DEGERATIVE JOINT DISEASE. EMPLOYEE HAS HAD TWO PREVIOUS SURGERIES.**