title: Multirater agreement of arthroscopic grading of knee articular cartilage.
abstract: BACKGROUND
  Acute and chronic cartilage injury of the knee has an important impact on prognosis. The validity of the classification of such injuries is critical for prospective multicenter studies. The agreement among multiple surgeons at different institutions for articular cartilage lesions has not been established.
  
  
  OBJECTIVE
  Arthroscopic classification of articular cartilage lesions is reliable and reproducible and can be used for multicenter studies involving multiple surgeons.
  
  
  METHODS
  Cohort study (diagnosis); Level of evidence, 1.
  
  
  METHODS
  A total of 6 surgeons from 5 centers reviewed 31 videos of articular cartilage lesions. With grade 2 and grade 3 combined for the analysis, observed agreement ranged from 81% to 94%, and kappa ranged from 0.34 to 0.87. An additional 22 videos comprising grade 2 and grade 3 lesions were analyzed, and the observed agreement was 80%, with an overall kappa of 0.47.
  
  
  CONCLUSIONS
  Arthroscopic grading of articular cartilage lesions is reproducible among surgeons at different centers.
  
  
  CONCLUSIONS
  Articular cartilage lesions can be reliably classified among surgeons at different sites. Such reliability is important for multicenter clinical research studies involving arthroscopic knee surgery.
authors.affiliation: Sports Medicine and Shoulder Service and Foster Center for Clinical Outcome Research, Hospital for Special Surgery, 535 East 70th Street, New York, New York 10021, USA. MarxR@hss.edu
authors.forename: Robert G
authors.initials: RG
authors.lastname: Marx
authors.forename: Jason
authors.initials: J
authors.lastname: Connor
authors.forename: Stephen
authors.initials: S
authors.lastname: Lyman
authors.forename: Annunziato
authors.initials: A
authors.lastname: Amendola
authors.forename: Jack T
authors.initials: JT
authors.lastname: Andrish
authors.forename: Christopher
authors.initials: C
authors.lastname: Kaeding
authors.forename: Eric C
authors.initials: EC
authors.lastname: McCarty
authors.forename: Richard D
authors.initials: RD
authors.lastname: Parker
authors.forename: Rick W
authors.initials: RW
authors.lastname: Wright
authors.forename: Kurt P
authors.initials: KP
authors.lastname: Spindler
mesh_terms: D001182:Arthroscopy / Q000592:standards / Q000706:statistics & numerical data*; D002358:Cartilage, Articular / Q000293:injuries*; D015331:Cohort Studies; D006801:Humans; D007718:Knee Injuries / Q000145:classification*; D015588:Observer Variation; D011379:Prognosis; D011446:Prospective Studies; D015203:Reproducibility of Results; D012720:Severity of Illness Index; D014741:Video Recording