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IKDC classification provided reliability, medium correlation with arthroscopic findings
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Use of the IKDC classification assessed with 45° posteroanterior flexion weight-bearing radiographs had the most favorable combination of reliability and correlation with arthroscopic findings among patients who underwent ACL reconstruction.
In a prospective, longitudinal, multicenter cohort study, researchers followed 632 patients who underwent radiographic evaluation of the knee through an anteroposterior weight-bearing radiograph, a posteroanterior weight-bearing radiograph made with the knee in 45° of flexion or both, and arthroscopic evaluation of the articular surfaces after ACL reconstruction.
Using the Kellgren-Lawrence, IKDC, Fairbank, Brandt et al., Ahlbäck and Jäger-Wirth classifications, three blinded examiners independently graded radiographic findings. The researchers assessed interobserver reliability with the intraclass correlation coefficient, and the association between radiographic classification and arthroscopic findings of tibiofemoral chondral disease was assessed with the Spearman correlation coefficient.
The researchers found a higher interobserver reliability in 45° posteroanterior flexion weight-bearing radiographs, as well as a higher correlation with arthroscopic findings of chondral disease vs. anteroposterior radiographs.
Overall, the IKDC classification demonstrated the best combination of good interobserver reliability and medium correlation with arthroscopic findings with respect to standards for the magnitude of the reliability coefficient and correlation coefficient.
Disclosure: See the study for a full list of all authors’ relevant financial disclosures.
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