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Knee Surgery, Sports Traumatology, Arthroscopy
Published in: Knee Surgery, Sports Traumatology, Arthroscopy 9/2011

01-09-2011 | Knee

Kinematic analysis of the flexion axis for correct femoral component placement

Authors: Georg Matziolis, Sascha Pfiel, Georgi Wassilew, Hinrich Boenicke, Carsten Perka

Published in: Knee Surgery, Sports Traumatology, Arthroscopy | Issue 9/2011

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Abstract

Purpose

This study evaluates a new method for intraoperative determination of femoral component rotation by a navigation system (flexion axis, FA) driven by joint stability over the range of motion.

Methods

Seventy-five patients were treated with a navigated total knee replacement. Intraoperatively, the posterior condylar axis (PCA), the Whiteside′s line (WL), and the surgical epicondylar axis (EA) were palpated, the flexion gap (FG) was determined, and the FA was calculated. The anatomical landmarks, lines, and angles were determined based on a postoperative computed tomography in all knees. The femoral rotation was intraoperatively determined by the surgeon based on the knowledge of the EA, the PCA, and the FG but not the FA.

Results

The deviation of the palpated EA was 3.5° [0°–13.8°], of the PCA externally rotated by 3° was 2.2° [0°–9.6°], of the WL was 3.8° [0.1°–10.0°], of the FG was 2.5° [0.2°–8.8°], and of the FA was 2.5° [0°–10.0°].

Conclusions

The FA is a new functionally acquired axis for the determination of optimal femoral component alignment. Whether the FA leads to clinically superior results must be clarified by subsequent studies.

Level of evidence

I.
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Metadata
Title
Kinematic analysis of the flexion axis for correct femoral component placement
Authors
Georg Matziolis
Sascha Pfiel
Georgi Wassilew
Hinrich Boenicke
Carsten Perka
Publication date
01-09-2011
Publisher
Springer-Verlag
Published in
Knee Surgery, Sports Traumatology, Arthroscopy / Issue 9/2011
Print ISSN: 0942-2056
Electronic ISSN: 1433-7347
DOI
https://doi.org/10.1007/s00167-011-1554-5

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