Occupational Illness, Miner carrying timber and slipped. Miner went to specialist on 9-9/ medical received on 9-14/ diagnoses,""Clinical impression is contusion/sprain of left knee with pre-existing degenerative changes, Post Op Changes, and Tibial Osteotomy from prior injuries and surgeries. X-ray shows positive degenerative changes/ post op changes, and negative acute trauma"".