To obtain preoperative, operative and postoperative clinical outcomes data for the Zimmer Gender Solutions PFJ Knee Prosthesis used in primary partial knee arthroplasty such as knee scoring and patient satisfaction such collection using Patient Questionaire and SF-12 forms. Kaplan-Meir survivorship analysis of the device will be performed. Radiographic analysis of the device will also be performed at 1, 2, 3, 5, 7, and 10 year follow-up. It is planned that the resultant data will be pooled and published by the evaluating surgeons.