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Published in: International Orthopaedics 9/2011

01-09-2011 | Original Paper

The lateral condyle index: a new index for assessing the length of the lateral articular trochlea as predisposing factor for patellar instability

Authors: Roland M. Biedert, Patricia Netzer, Imre Gal, Andrea Sigg, Philippe M. Tscholl

Published in: International Orthopaedics | Issue 9/2011

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Abstract

The central trochlea has been considered as the major location of dysplasia. The purpose of this study was to investigate the influence of the lateral trochlea on patellar stability and to establish a new method for measuring the lateral trochlea on sagittal magnetic resonance (MR) images. Twenty-eight knees of 23 patients suffering from lateral patellar subluxation (12 knees with radiological signs of central trochlear dysplasia) and of 46 patients without patellofemoral complaints (without central trochlear dysplasia) were analysed. The lateral condyle index was designed to measure the lateral trochlea by comparing the anterior cartilaginous trochlea (a) and the posterior aspect (p) [(a:p)× 100]. The lateral condyle index showed high interrater reliability (r = .94) and was significantly (p < 0.001) lower in symptomatic patients (86%) than in the control group (93%). These results show high clinical relevance of the lateral trochlea as another factor for patellar instability.
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Metadata
Title
The lateral condyle index: a new index for assessing the length of the lateral articular trochlea as predisposing factor for patellar instability
Authors
Roland M. Biedert
Patricia Netzer
Imre Gal
Andrea Sigg
Philippe M. Tscholl
Publication date
01-09-2011
Publisher
Springer-Verlag
Published in
International Orthopaedics / Issue 9/2011
Print ISSN: 0341-2695
Electronic ISSN: 1432-5195
DOI
https://doi.org/10.1007/s00264-010-1142-1

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