On 1-10-13, emp. reported to supervisor he has some knee problems from running the drag line but didn't file a claim. He was backup dragline operator since 9-29-08 full time operator from 1985 to 2008. On 2-19-13, limited activity on the drag-line. He was permanently taken off the dragline, then put on loader. On 2-25-13 he was diagnosed with Bilateral Knee Tendonitis, has PT.