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Published in: Knee Surgery, Sports Traumatology, Arthroscopy 8/2012

01-08-2012 | Knee

Influence of the valgus force during knee flexion in neutral rotation

Authors: Musa Citak, Padhraig F. O’Loughlin, Mustafa Citak, Eduardo M. Suero, Marianne R. F. Bosscher, Volker Musahl, Andrew D. Pearle

Published in: Knee Surgery, Sports Traumatology, Arthroscopy | Issue 8/2012

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Abstract

Purpose

The pivot shift test is generally accepted to be a clinically useful tool. In the current study, the authors aimed to determine the minimum amount of valgus force required to elicit a positive pivot shift test utilizing a mechanized pivot shifter device in ACL-deficient knees. The authors proposed that increasing the applied force from a minimum critical value would lead to greater magnitudes of femoro-tibial translation.

Materials and methods

Six fresh-frozen pelvis-to-toes specimens were used in this cadaveric study. Tracking and recording of tibiofemoral kinematics during throughout testing was achieved by an image-free surgical navigation system with dedicated ACL software. A load cell was attached to the mechanized pivot shifter through a three-degree-of-freedom arm. Valgus force magnitudes of 0–5 kg were then sequentially applied, and knee flexion in neutral rotation was performed on the ACL-deficient knees. A total of two trials were performed for each force.

Results

The greatest difference in lateral and medial compartment translation, during the pivot shift test, utilizing a mechanized pivot shifter in an ACL-deficient knee, was measured between an applied valgus force of 0 and 1 kg. The mean difference between 4 and 5 kg was 0.2 mm (CI = −11.29 to 10.89) for the lateral compartment, and there was no difference in translation for the medial compartment (CI = −17.43 to 17.43).

Conclusions

The principal finding of the current study was that a greater force does not produce a greater magnitude of femoro-tibial translation during knee flexion in neutral rotation, contrary to the initial hypothesis.
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Metadata
Title
Influence of the valgus force during knee flexion in neutral rotation
Authors
Musa Citak
Padhraig F. O’Loughlin
Mustafa Citak
Eduardo M. Suero
Marianne R. F. Bosscher
Volker Musahl
Andrew D. Pearle
Publication date
01-08-2012
Publisher
Springer-Verlag
Published in
Knee Surgery, Sports Traumatology, Arthroscopy / Issue 8/2012
Print ISSN: 0942-2056
Electronic ISSN: 1433-7347
DOI
https://doi.org/10.1007/s00167-011-1767-7

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