EE WAS BACKING HAUL UNIT UNDER LOADER TO BE LOADED WITH SHOT ROCK. AS HE NEARED THE LOADER, HIS BACK TIRE ROLLED ONTO A SLIGHTLY HIGHER SPOT ON THE PIT FLOOR. THIS CAUSED HIS BED TO TILT UP HITTING LOADER ARM. HE RECEIVED STRAIN TO NECK/SHOULDER ARE. WAS 1ST AID(AND DR'S 1ST AID) UNTIL 10/13 WHEN HE BEGAN MEDICAL TREATMENT(PHYSICAL THERAPY)