Dennis van Duijvenbode1, Michel Stavenuiter2, Bart Burger2, Cees van Dijke3, Jacco Spermon4, Marco Hoozemans5. 1. Department of Orthopaedic Surgery, Medisch Centrum Alkmaar/Centre for Orthopaedic Research Alkmaar (CORAL), Alkmaar, the Netherlands. d.c.duijvenbode@mca.nl. 2. Department of Orthopaedic Surgery, Medisch Centrum Alkmaar/Centre for Orthopaedic Research Alkmaar (CORAL), Alkmaar, the Netherlands. 3. Department of Radiology, Medisch Centrum Alkmaar, Alkmaar, the Netherlands. 4. Department of Radiology, Ziekenhuis Gelderse Vallei, Ede, the Netherlands. 5. Faculty of Human Movement Sciences, MOVE Research Institute Amsterdam, Amsterdam, Netherlands.
Abstract
PURPOSE: The objective of this study was to evaluate the inter-observer reliability and the intra-observer reliability of four patellar height ratios: Insall-Salvati (IS), modified Insall-Salvati (MIS), Blackburne-Peel (BP) and Caton-Deschamps (CD). METHODS: The patellar height ratios were assessed by four independent examiners using weight-bearing lateral knee radiographs in 30° flexion. Intra-class correlation coefficients and Fleiss' kappa's were determined. RESULTS: The inter-observer reliability was excellent for the IS and moderate for the other ratios. When the ratio values were categorized, the inter-observer reliability was strong for the IS, moderate for the MIS and BP, and poor for the CD. The intra-observer reliability was excellent for the IS, MIS and CD, and strong for the BP. When the ratio values were categorized, the intra-observer reliability was strong for the IS and MIS, and moderate for the other ratios. CONCLUSION: Although the IS showed best reliability, we advise to use the MIS as it showed the second best reliability but is, according to the literature, associated with better validity.
PURPOSE: The objective of this study was to evaluate the inter-observer reliability and the intra-observer reliability of four patellar height ratios: Insall-Salvati (IS), modified Insall-Salvati (MIS), Blackburne-Peel (BP) and Caton-Deschamps (CD). METHODS: The patellar height ratios were assessed by four independent examiners using weight-bearing lateral knee radiographs in 30° flexion. Intra-class correlation coefficients and Fleiss' kappa's were determined. RESULTS: The inter-observer reliability was excellent for the IS and moderate for the other ratios. When the ratio values were categorized, the inter-observer reliability was strong for the IS, moderate for the MIS and BP, and poor for the CD. The intra-observer reliability was excellent for the IS, MIS and CD, and strong for the BP. When the ratio values were categorized, the intra-observer reliability was strong for the IS and MIS, and moderate for the other ratios. CONCLUSION: Although the IS showed best reliability, we advise to use the MIS as it showed the second best reliability but is, according to the literature, associated with better validity.
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