title: Arthroscopic partial meniscectomy versus sham surgery for a degenerative meniscal tear.
abstract: BACKGROUND
  Arthroscopic partial meniscectomy is one of the most common orthopedic procedures, yet rigorous evidence of its efficacy is lacking.
  
  
  METHODS
  We conducted a multicenter, randomized, double-blind, sham-controlled trial in 146 patients 35 to 65 years of age who had knee symptoms consistent with a degenerative medial meniscus tear and no knee osteoarthritis. Patients were randomly assigned to arthroscopic partial meniscectomy or sham surgery. The primary outcomes were changes in the Lysholm and Western Ontario Meniscal Evaluation Tool (WOMET) scores (each ranging from 0 to 100, with lower scores indicating more severe symptoms) and in knee pain after exercise (rated on a scale from 0 to 10, with 0 denoting no pain) at 12 months after the procedure.
  
  
  RESULTS
  In the intention-to-treat analysis, there were no significant between-group differences in the change from baseline to 12 months in any primary outcome. The mean changes (improvements) in the primary outcome measures were as follows: Lysholm score, 21.7 points in the partial-meniscectomy group as compared with 23.3 points in the sham-surgery group (between-group difference, -1.6 points; 95% confidence interval [CI], -7.2 to 4.0); WOMET score, 24.6 and 27.1 points, respectively (between-group difference, -2.5 points; 95% CI, -9.2 to 4.1); and score for knee pain after exercise, 3.1 and 3.3 points, respectively (between-group difference, -0.1; 95% CI, -0.9 to 0.7). There were no significant differences between groups in the number of patients who required subsequent knee surgery (two in the partial-meniscectomy group and five in the sham-surgery group) or serious adverse events (one and zero, respectively).
  
  
  CONCLUSIONS
  In this trial involving patients without knee osteoarthritis but with symptoms of a degenerative medial meniscus tear, the outcomes after arthroscopic partial meniscectomy were no better than those after a sham surgical procedure. (Funded by the Sigrid Juselius Foundation and others; ClinicalTrials.gov number, NCT00549172.).
authors.affiliation: From the Department of Orthopedics and Traumatology, Hatanpää City Hospital, Tampere (R.S.), the Department of Orthopedics and Traumatology, Helsinki University Central Hospital and University of Helsinki (M.P., J.K., T.L.N.J.), and the National Institute for Health and Welfare, Center for Health and Social Economics (A.M.), Helsinki, the Department of Orthopedics and Traumatology, University of Turku, Turku (A.I.), the Department of Orthopedics, Traumatology, and Hand Surgery, Kuopio University Hospital, Kuopio (A.J.), and the Department of Orthopedics and Traumatology, Central Finland Central Hospital, Jyväskylä (H.N.) - all in Finland.
authors.forename: Raine
authors.initials: R
authors.lastname: Sihvonen
authors.forename: Mika
authors.initials: M
authors.lastname: Paavola
authors.forename: Antti
authors.initials: A
authors.lastname: Malmivaara
authors.forename: Ari
authors.initials: A
authors.lastname: Itälä
authors.forename: Antti
authors.initials: A
authors.lastname: Joukainen
authors.forename: Heikki
authors.initials: H
authors.lastname: Nurmi
authors.forename: Juha
authors.initials: J
authors.lastname: Kalske
authors.forename: Teppo L N
authors.initials: TL
authors.lastname: Järvinen
mesh_terms: D000328:Adult; D000368:Aged; D001182:Arthroscopy / Q000379:methods; D004311:Double-Blind Method; D005081:Exercise Therapy; D005260:Female; D006801:Humans; D057194:Intention to Treat Analysis; D007718:Knee Injuries / Q000534:rehabilitation / Q000601:surgery*; D008297:Male; D008592:Menisci, Tibial / Q000601:surgery*; D008875:Middle Aged; D010146:Pain; D010147:Pain Measurement; D010919:Placebos; D011182:Postoperative Care; D000070600:Tibial Meniscus Injuries; D016896:Treatment Outcome
chemical_list: D010919:Placebos