%0 Journal Article
%T KOOS
%A Brian Pietrosimone
%A Brittany N. Hand
%A Chris M. Gregory
%A Christopher Kuenze
%A Craig A. Velozo
%A Harris S. Slone
%A Jennifer L. Hunnicutt
%A Michelle M. McLeod
%J Sports Health
%@ 1941-0921
%D 2019
%R 10.1177/1941738118812454
%X Measurement properties of the short form of the Knee injury and Osteoarthritis Outcome Score (KOOS-JR) are not established in individuals after anterior cruciate ligament reconstruction (ACLR). The purpose of this study was to determine the extent to which the KOOS-JR measures the construct of knee health in individuals post-ACLR using Rasch analysis. The KOOS-JR will fit the Rasch model, but significant ceiling effects will be present. Cross-sectional study. Level 3. Rasch analysis of the KOOS-JR from 166 individuals 10 months post-ACLR was conducted. Unidimensionality, a key criterion of the Rasch model, was evaluated using confirmatory factor analysis. Model fit of the rating scale, items, and persons were evaluated. Mean square fit statistics ¡Ý1.6 and standardized z-scores ¡Ý2.0 were indicative of person or item misfit. Additionally, reliability indicators including person reliability and separation indices were examined. The KOOS-JR fit the criteria of unidimensionality. All items demonstrated model fit; however, ceiling effects were noted (n = 36; 22%). Person reliability was low (0.47). Calculation of person strata revealed that the KOOS-JR did not separate participants into more than 1 stratum. The mean person measure was 3.56 logits higher than the mean item measure, indicating that this sample is skewed toward increased knee health. Although the KOOS-JR represented a unidimensional construct with items and persons fitting the Rasch model, several limitations were noted: ceiling effects, low person reliability, and poor person differentiation. Ceiling effects indicate that many individuals in this sample experienced better knee health than the KOOS-JR items were able to measure. Evaluating the measurement properties of the KOOS-JR is necessary to determine its clinical value in sports medicine. In later stages after ACLR recovery, administration of the KOOS-JR may not be adequate
%K anterior cruciate ligament reconstruction
%K patient-reported outcomes
%K KOOS-JR
%K Rasch
%K rehabilitation
%U https://journals.sagepub.com/doi/full/10.1177/1941738118812454