Employee was cleaning under the 405 A HyTank when his foot slipped and he bumped his knee on a quick connect, at the time he said he didn't need medical attention. On 12/14/12 employee was seen by Concentra for a potential torn cartilage. On 3/4/2013 Concentra received back MRI report. Diagnosis was consistent with the incident employee reported on 8/9/2012.