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International Orthopaedics
Published in: International Orthopaedics 9/2016

01-09-2016 | Original Paper

Pre-operative radiological measurement of femoral rotation for prosthetic positioning in total knee arthroplasty

Authors: Liliana Savin, Paul Botez, Dan Mihailescu, Vlad Predescu, Carmen Grierosu

Published in: International Orthopaedics | Issue 9/2016

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Abstract

Purpose

This study outlines the benefits of the seated view radiograph of the knee in evaluation of the pre-operative individual distal femoral torsion (DFT) and for the follow-up of the post-operative rotational positioning of the femoral component in total knee arthroplasty.

Methods

Study on 20 patients who underwent total knee arthroplasty and the correlation between the DFT measured before surgery with this radiology view, the intra-operative external rotation (ER) necessary for the parallel positioning of the femoral component with the transepicondylar axis (TEA) and the post-operative femoral rotational alignment of the prosthesis on the same view.

Results

In 90 % of cases the values of internal DFT were between −10 and −80, while the mean value of the internal rotation (IR) was −4.450. The mean value of the ER applied to the posterior bone resection was 4.250 (00–70), showing a statistically significant correlation between the pre-operative measurement and the intra-operative one of the posterior condylar angle (PCA) (r = 0.890, p = 0.000). Residual internal femoral malrotation has been identified in four cases, its mean value being 0.40. In three patients the pre-operative value of the PCA was higher than the intra-operative one and an internal malrotation of the post-operative femoral component was observed.

Conclusions

The results are encouraging for the further use of this pre-operative view with the premises of increasing the accuracy of prosthetic positioning and reducing the mechanical complications.
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Metadata
Title
Pre-operative radiological measurement of femoral rotation for prosthetic positioning in total knee arthroplasty
Authors
Liliana Savin
Paul Botez
Dan Mihailescu
Vlad Predescu
Carmen Grierosu
Publication date
01-09-2016
Publisher
Springer Berlin Heidelberg
Published in
International Orthopaedics / Issue 9/2016
Print ISSN: 0341-2695
Electronic ISSN: 1432-5195
DOI
https://doi.org/10.1007/s00264-015-3110-2

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