Reproducibility and responsiveness of a Danish Pedi‐IKDC subjective knee form for children with knee disorders

Abstract

The modified International Knee Documentation Committee Subjective Knee Form (Pedi-IKDC) is a widely used patient-reported tool ranging on a scale from 0 to 100. We aimed to translate Pedi-IKDC into Danish and assess its reproducibility and responsiveness in children with knee disorders. The translation complied with the international guidelines. Reproducibility was assessed in 53 children (15 years) responding Pedi-IKDC at baseline and after 3-14 days. For analysis of responsiveness, 94 children (15 years) responded Pedi-IKDC again after 3 months. Test-retest reliability was excellent. Intraclass correlation coefficient was 0.9, standard error of measurement was 4.1 points, and smallest detectable change (SDC) was 11.3 points. Evaluating responsiveness as a large effect was found in children reporting improvement compared with children reporting deterioration. The change score was correlated to the external anchor Global Rating Scale consisting of 15 answers from -7 "A very great deal worse" to +7 "A very great deal better," with a Spearmen's rho of 0.45 (P > 0.001). The minimal clinically important changes was 12.0. In conclusion, excellent test-retest reproducibility was found at group level, but at individual level the SDC was high. The Pedi-IKDC showed adequate responsiveness and is suitable for assessing improvement or deterioration in children with knee disorders.

Good Subjective Outcomes, Stable Knee and High Return to Sport after Tibial Eminence Avulsion Fracture in Children

“…Patients were contacted and the Italian version [ 14 ] of the pediatric International Knee Documentation Committee score (Pedi-IKDC) (score of 0 to 100 with higher score equivalent to less pain and better function, and a minimally clinical important difference of 12 points) [ 15 , 16 ], and the Hospital for Special Surgery pediatric Functional Activity Brief Scale (Pedi-FABS) [ 17 ] (score 0 to 30 with higher score meaning better performance) were administered. Return to sport and further surgeries were inquired as well.…”

Patient-Reported Outcome Measures for Patellofemoral Instability: a Critical Review

“…The Pedi-IKDC has demonstrated high internal consistency (Cronbach's alpha coefficient = 0.9-0.91) [73,74]. The testretest reliability was excellent (ICC = 0.9) and the SEM has been reported at 4.1 [74].…”

“…A sub-analysis specifically for patellofemoral instability was not performed, nor was it performed in the subsequent Danish translation validation. Psychometric testing of the Pedi-IKDC reported below is taken from large groups of pediatric patients with a variety of knee conditions that included 17-27% patellofemoral instability [73,74].…”

Treatment Decision after Anterior Cruciate Ligament Injury, and Evaluation of Measurement Properties of a Patient Reported Outcome Measure

“…The score was intermediate, mainly because no comparisons of similar patient groups in the original language (English) and the target language were made. In the updated review, eight additional studies 48 15,53,57,58,62,67,121,125 were assessed; two had a good methodological score, three had fair. The low methodological quality in many studies (the Swedish version included) were mainly due to small samples and no differential function item (DIF) testing.…”

“…In the systematic review, responsiveness was given a strong positive score, which was further strengthened in the updated review. In the update, seven studies with methodological score fair 15,54,57,121 , good 95 and excellent 68,92 had good result for responsiveness, mainly assessed with measures of area under the curve (AUC) and hypothesis testing.…”