Subjects will be enrolled within 60 days prior to surgery and take part in follow-up visits for two years following surgery. A preoperative visit will occur at the time of enrollment. Follow-up visits will occur at the study site at 6 weeks, 3 months, 6 months, 12 months, and 24 months post-surgery. Telephone follow-up interviews will be done at 18 months post-surgery. Target enrollment is 201subjects, to include 134 subjects in the treatment group (Subchondroplasty + Arthroscopy) and 67 subjects in the control group (Arthroscopy alone). Subjects will complete the study at the 24 month follow-up visit. For the purposes of this protocol, a revision will be defined as any partial or total joint arthroplasty or any bone fixation, bone grafting or bone substitute procedure in the same compartment in the study knee.