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Creating A Crosswalk For Knee Outcomes After ACLR From The KOOS(5) To The IKDC-SKF

2021 Congress Paper Abstracts

Creating A Crosswalk For Knee Outcomes After ACLR From The KOOS(5) To The IKDC-SKF

Jessica L. Johnson, DPT, PhD, UNITED STATES Aaron Boulton, PhD, UNITED STATES Kurt P. Spindler, MD, UNITED STATES Laura J. Huston, MS, UNITED STATES Tim Spalding, FRCS(Orth), UNITED KINGDOM Laura Asplin, UNITED KINGDOM May Arna Risberg, PT, PhD, NORWAY Lynn Snyder-Mackler, PT, ScD, FAPTA, UNITED STATES

University of Delaware, Newark, DE, UNITED STATES


2021 Congress   Abstract Presentation   6 minutes   Not yet rated

 

Anatomic Location

Anatomic Structure

Ligaments

ACL

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Summary: We created a statistical method to convert KOOS scores to IKDC-SKF scores pre- and post-ACLR using three large datasets to enable more rigorous comparisons and pooling for meta-analysis.


The variance of patient reported outcomes measures (PROM) used in both clinical and research practice limits the comparison of outcomes and prevents pooling of data for meta-analysis. Two commonly used PROM in anterior cruciate ligament (ACL) registries and cohorts are the Knee Injury Osteoarthritis Outcomes Survey (KOOS) and International Knee Documentation Committee-Subjective Knee Form (IKDC-SKF), but few studies collect or report both scores. Our objective was to create a statistical method to convert averaged KOOS scores to IKDC-SKF scores to enable more rigorous comparisons and pooling for meta-analysis.

Methods

We used equipercentile equating methods to create a statistical crosswalk in one ACL cohort at three time-points: pre-ACL reconstruction (ACLR) and 24- and 72-months after ACLR; this was validated in two other ACL cohorts at similar time-points: pre-ACLR and 24- and 60-months post-ACLR.

Results

We observed high correlations (r=0.81-0.90), unidimensionality (first to second eigenvalues= 8.7-13.3), and subpopulation invariance (root expected mean squared difference=0.009-0.017). The smallest disagreements between crosswalked and true scores was using the 24-month scores; these had a bias of less than 0.1 standard deviation unit.

Conclusion

Our crosswalk is statistically merited and accurately converts group level average KOOS scores to IKDC-SKF scores. This tool will allow for more comparisons and meta-analyses of outcomes after ACL reconstruction, improving our treatment of and outcomes after ACL injury and reconstruction.


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