EE was injured on 08/04/2004, and worked without missing until 11/23/2004 when he had orthoscopic surgery on his right knee. On 8/4/04 he was on 001 sect., in #4 hd. putting up bolts. EE dragged a bolt from the machine, and turned. His r. foot was between two rocks and twisted his right knee. He continued to work until 11/23/2004.