Due to horseplay, injured EE was pushed, lost his balance & twisted his shoulder as he caught himself. Dr. determined EE had strained shoulder muscle which resulted in 1st aid incident. He was revaluated by an orthopedic surgeon & determined to have a torn rotator cuff. Surgery conducted on 1/17/13. At a follow up on 1/21/13 the dr wouldn't release back to modified work.