EE WAS CONDUCTING A PRE-SHIFT EXAM OF THE WATER TRUCK. AS HE WAS ON THE GROUND & WALKING AROUND THE TRUCK, HE SLIPPED & CAUGHT HIMSELF. HE IMMEDIATELY FELT PAIN DOWN HIS RT. LEG. EE REFUSED TO SEEK MEDICAL ATTN. & COMPLETED SHIFT. THE EE WORKED HIS NEXT 2 SCHEDULED SHIFTS. AFTER HE WAS OFF ON SUNDAY, HE CALLED IN ON MONDAY, STATING THAT HIS BACK HAD WORSENED & HE NEEDED MED.ATTN.