Observer Variability of Arthroscopic Cartilage Grading Using the Modified Outerbridge Classification System in the Dog.

Objective:  The aim of this study was to determine the inter- and intra-observer variability of the modified Outerbridge cartilage classification system in canine joints evaluated via arthroscopy.

Materials And Methods:  Fifty arthroscopic videos of canine cartilage were scored by six observers, where three of the observers had significant arthroscopic experience and three had minimal to no experience. The kappa () statistic was used to evaluate overall and individual score inter-observer variability, as well as experience variability.