EE was repeatedly swing sledge hammers to help unplug feed chute. He was sore that night, but woke up next morning feeling worse & reported injury when he came to work 12/22. Initially he felt it was a slight pull & he worked that day. 2 doc visits 12/23 diagnosis: strain-rotator cuff, release no restrictions, 12/27 prescribed Naproxin, 2 wks PT, again no restrictions.