Medial meniscal extrusion: a validation study comparing different methods of assessment

Knee Surgery, Sports Traumatology, Arthroscopy : Official Journal of the ESSKA
Luke D JonesDavid J Beard

Abstract

Longitudinal cohort studies of knee OA aetiology use MRI to assess meniscal extrusion within the same knee at sequential time points. A validated method of assessment is required to ensure that extrusion is measured at the same location within the knee at each time point. Absolute perpendicular extrusion from the tibial edge can be assessed using the reference standard of segmentation of the tibia and medial meniscus. This is labour intensive and unsuitable for large cohorts. Two methods are commonly used as proxy measurements. Firstly, the apex of the medial tibial spine is used to identify a reproducible MRI coronal slice, from which extrusion is measured. Secondly, the coronal MRI slice of the knee demonstrating the greatest extrusion is used. The purpose of this study was to validate these two methods against the reference standard and to determine the most appropriate method to use in longitudinal cohort studies. We hypothesised that there is no difference in absolute meniscal extrusion measurements between methods. Twenty high-resolution knee MRI scans were obtained in asymptomatic subjects. The tibia and medial meniscus were manually segmented. A custom MATLAB program was used to determine the difference in medial menisc...Continue Reading

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Citations

Nov 21, 2020·Archives of Orthopaedic and Trauma Surgery·Philipp W WinklerChristian Fink

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Software Mentioned

Mimics
CETCEM
MATLAB
SPSS

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