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Int Orthop. 2016 Mar;40(3):493-7. doi: 10.1007/s00264-015-2908-2. Epub 2015 Jul 16.

The reliability of four widely used patellar height ratios.

Author information

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.

KEYWORDS:

Patella alta; Patellar height; Reliability; Reproducibility; Variability

PMID:
26178255
DOI:
10.1007/s00264-015-2908-2
[Indexed for MEDLINE]

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