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In recent years, there has been a significant advancement in our understanding of femoroacetabularimpingement and associated labral and chondral pathology. Surgeons worldwidehave demonstrated the successful treatment of these lesions via arthroscopic and opentechniques. The aim of this study is to validate a simple and reproducible classification systemfor acetabular chondral lesions.MethodsIn our classification system, the acetabulum is first divided into 6 zones as described byIlizalithurri VM et al [Arthroscopy 24(5) 534-539]. The cartilage is then graded as 0 to 4 asfollows: Grade 0 – normal articular cartilage lesions; Grade 1 softening or wave sign; Grade 2 -cleavage lesion; Grade 3 - delamination and Grade 4 –exposed bone. The site of the lesion isfurther typed as A, B or C based on whether the lesion is 1/3 distance from acetabular rim tocotyloid fossa, 1/3 to 2/3 distance from acetabular rim to cotyloid fossa and > 2/3 distance fromacetabular rim to cotyloid fossa.For validating the classification system, six surgeons reviewed 14 hip arthroscopy video clips.All surgeons were provided with written explanation of our classification system. Each surgeonthen individually graded the cartilage lesion. A single observer then compared results forobserver variability using kappa statistics.ResultsWe observed a high inter-observer reliability of the classification system with a kappacoefficient of 0.89 (range 0.78 to 0.91) and high intra-observer reliability with a kappacoefficient of 0.91 (range 0.89 to 0.96).In conclusion we have developed a simple reproducible classification system for acetabularcartilage lesions seen at hip arthroscopy.Thursday, October 7, 2010, 8:00-8:50Session A1: Alternate Bearings in THA 1Tribological Evaluation of a Spacer Cement Without Hard Radio ContrastAgentsfile:///E|/ISTA2010-Abstracts.htm[12/7/2011 3:15:47 PM]