EE WAS WORKING IN CRAMPED QUARTERS CHANGING HOSES ON EX3500 WHEN HIS KNEE LOCKED IN PLACE, THE LOCKING EPISODES BECAME MORE FREQUENT, AT THAT TIME HE WAS TAKEN TO QUEST ORTHOPAEDIC WHERE A DIA GNOSIS WAS MADE OF A PROBABLE MEDIAL MENISCUS TEAR OF THE RIGHT KNEE. HE RETURNED TO WORK WITH NO RESTRICTIONS. HE HAD ARTHROSCOPIC SURGERY ON 2/13/03, BECAME REPORTABLE BECAUSE OF LOST TIME.