- Low pain score on WOMAC, a widely used and well validated questionnaire to assess knee symptoms. To evaluate response, the researchers will require that patients have a minimal score of at least 4 out of 10 on at least 2 of 5 questions, or a total of greater than 15 out of 50 for the WOMAC pain scale in the eligible knee at pre-randomization phone call and visit, and at randomization visit. This will allow us to detect response to treatment if response occurs.