Employee (EE)claimed he fell and struck his knee on a maintenance hatch on overhead crane.EE. did not go to Dr. until 1/20/06. EE had series of dr.'s visits with no problem found even on MRI until explor. surg. on 3/9/06 when EE first missed work. Small tear found in meniscus may have been preexisting. Knee had prev. operation. Ins. just agreed to accept claim.