""EYES ON PATH"" Incident - While walking on ground level & looking up to diagnose noise coming from C11 conveyor, the EE stepped on a 3"" rock causing his rt. ankle & knee to roll. The EE sought medical treatment on 9/24/12 & diagnosed with a knee sprain. On 9/28/12, the MRI revealed no deterioration or damage, but the employee will have to go to physical therapy for 2 weeks.