EMPLOYEE CLAIMS WHILE GETTING OUT OF THE OPR'S COMPARTMENT OF THE ROOF BOLTER HE FELT PAIN IN HIS BACK AND HIP. CAUSE OF INJURY WS OVEREXERTION. MINR ATTITUDE A FACTOR, MINING EQUIPMENT/SYST EMS NOT A FACTOR, COMPLIANCE WITH RULES/REGS NOT A FACTOR, PERSONAL PROTECTIVE EQUIPMENT OK.