Many studies show that conservative therapy, including physical therapy, is not inferior to arthroscopy for patients with knee osteoarthritis (e.g., NEJM JW Gen Med Aug 1 2015 and BMJ 2015; 350:274). For this report, investigators reviewed 13 randomized, controlled trials and 12 observational studies in which arthroscopic surgery was compared with conservative management (including sham surgery) in patients with degenerative knee disease. Degenerative knee disease was defined as persistent knee pain, with or without osteoarthritis, that affects a patient’s quality of life. Arthroscopic procedures were defined as debridement, partial meniscectomy, or both.