TY - JOUR
T1 - The reliability of four widely used patellar height ratios
AU - van Duivenbode, D.C.
AU - Stavenuiter, M.H.J.
AU - Burger, B.J.
AU - van Dijke, C.F.
AU - Spermon, J.
AU - Hoozemans, M.J.M.
PY - 2016
Y1 - 2016
N2 - 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.
AB - 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.
U2 - 10.1007/s00264-015-2908-2
DO - 10.1007/s00264-015-2908-2
M3 - Article
SN - 0341-2695
VL - 40
SP - 493
EP - 497
JO - International Orthopaedics
JF - International Orthopaedics
IS - 3
ER -
