PURPOSE: The purpose of this study is to determine if there is a correlation between preoperative Kellgren-Lawrence (KL) grade and intraoperative Outerbridge scores which are both tools utilized to assess knee osteoarthritis. METHODS: Patients undergoing knee arthroscopy and partial meniscectomy procedures with or without chondroplasty between August 2012 and October 2020, were enrolled in this study. Preoperative Kellgren-Lawrence (KL) grades were recorded, and Outerbridge scores were obtained intraoperatively for each of the six joint surfaces (medial and lateral femoral condyle, medial and lateral tibial plateau, patella, and trochlea). A total Outerbridge score was then calculated by summing the grades for the six joint surfaces. The level of agreement between KL and Outerbridge grades was assessed using Cohen's weighted Kappa (K), with values from 0 to 0.20 indicating no or slight agreement, 0.21 to 0.40 as fair, 0.41 to 0.6 as moderate, 0.61 to 0.8 as substantial, and greater than 0.8 as almost perfect agreement. RESULTS: 468 patients were included in this study (271 (58%) female, 197 (42%) male, age=49 (10.35), BMI=30.5 (7) kg/m CONCLUSIONS: There is little agreement between the radiographic KL grade and intraoperative Outerbridge classification systems. Thus, the association between radiographic assessments and cartilage health may need to be reconsidered due to this lack of correlation. LEVEL OF EVIDENCE: IV: Retrospective Therapeutic Case Series.