Arthroscopic Electromechanical Assessment of Human Articular Cartilage Injury Correlates with ICRS Scores

Purpose. This study aimed to conduct arthroscopic evaluation of cartilage electromechanical properties and establish their correlation with International Cartilage Repair Society (ICRS) grading scores.Methods. In 18 patients, quantitative parameter (QP) measurements were taken on the weight-bearing surface of the medial femoral condyle. Adjacently, the same site was graded using ICRS scores (0-4). Electromechanical QPs for ICRS grades 0 to 3 were obtained during arthroscopy, while complete grade 4 injuries were assessed using femur cartilage-bone blocks from knee arthroplasty. The QP values for ICRS grades 0 to 2 were compared with grades 3 and 4 using Welch t test. The corresponding QP values were assigned to ICRS grades 0 to 4 and compared using Welch ANOVA (analysis of variance). Pearson's coefficient evaluated QP-ICRS grade relationship.Results. Healthy grade 0 cartilage displayed a mean QP value of 10.5 (+/- 2.8 SD, n = 4). The ICRS grade 1 and grade 2 injuries were associated with QP values of 12 (+/- 0.7, n = 2) and 13.25 (+/- 1.77, n = 2), respectively. The grade 3 defects had QP values of 20.43 (+/- 4.84, n = 4), whereas complete grade 4 defects showed electromechanical values of 30.17 (+/- 2.19, n = 6). Significant differences in QP values were observed between ICRS grades 0 to 2 (mean QP 11.56 +/- 2.3, n = 8) and grades 3 and 4 (26.27 +/- 6, n = 10; P < 0.0001). Pearson's correlation coefficient of 0.9 indicated a strong association between higher ICRS cartilage injury grades and elevated QP values (P < 0.0001).Conclusion. Arthroscopic electromechanical QP assessment robustly correlates with ICRS scores. The QP values for ICRS grades 0 to 2 are significantly lower, compared with grades 3 and 4.