THE EMPLOYEE WAS REMOVING A BROKEN FITTING FROM THE ROOF BOLTER. HE WAS PUSHING ON A WRENCH WHEN HE HEARD A POPPING SOUND & FELT A SHARP PAIN IN HIS RT. SHOULDER. THE EE RETURNED TO WORK IN HIS REGULAR JOB & LATER HAD AN MRI DONE & SURGERY ON 01/19/06. FIRST DAY OUT 1/09/06.