EE was repairing dozer 10/12/09 in the field during a rain, EE slipped in the mud and felt burning sensation in his right knee. 10/13/09 knee was swollen and stiff requested to see a Dr. Diagnosed with knee strain. Follow-up visit with Dr. MRI was ordered showed a moderate partial thickness tear to the PCL. Physical Therapy was ordered 3 times a week for three weeks.