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Knee Surgery, Sports Traumatology, Arthroscopy
Published in: Knee Surgery, Sports Traumatology, Arthroscopy 11/2016

01-11-2016 | Knee

ACL rupture and joint laxity progression: a quantitative in vivo analysis

Authors: C. Signorelli, G. Filardo, T. Bonanzinga, A. Grassi, S. Zaffagnini, M. Marcacci

Published in: Knee Surgery, Sports Traumatology, Arthroscopy | Issue 11/2016

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Abstract

Purpose

Benefits of an early reconstruction and the optimal time lapse between injury and surgery to reduce the effects of altered kinematics in ACL-deficient knees are still controversial.

Aim

The aim of this study was to clarify, through a quantitative in vivo evaluation, the effects of the time lapse between ACL injury and surgery in terms of changes in the pre-operative knee laxity.

Methods

An in vivo study was performed on 99 patients who underwent ACL surgery. Just before the graft fixation, six laxity tests were performed for all the subjects at manual-maximum load: anterior–posterior displacement and internal–external rotation at 30° and 90° of knee flexion (AP30, AP90, IE30, IE90) as well as varus–valgus rotation (VV0, VV30) at 0° and 30° of flexion. Kinematics data were acquired by a navigation system. The Spearman rank correlation was used to assess correlation between rank and continuous data. Significance was set at P = 0.05.

Results

The analysis highlighted a significant influence of the injury-to-surgery time lapse on VV0 and AP90 compared with pre-operative laxity levels. Meniscus status also significantly affected the pre-operative laxity in the VV0 (Spearman's ρ = 0.203, P = 0.038; GLM with meniscal correction partial η = 0.27, P = 0.007) and AP90 (Spearman's ρ = 0.329, P = 0.001; GLM with meniscal correction partial η = 0.318, P = 0.017) tests.

Conclusion

The main finding of this study is that patients with ACL rupture and a higher injury-to-surgery time present higher values of knee laxity involving AP90 displacement and VV30 rotation. Clinical relevance of the study is that ACL-deficient joint laxity, involving anterior–posterior displacement at 90° of knee flexion and varus–valgus rotation at 0° of flexion, is significantly affected by the lapse of injury-to-surgery time. This highlights the importance of considering the effects of delaying surgery when managing patients with such deficiency.
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Metadata
Title
ACL rupture and joint laxity progression: a quantitative in vivo analysis
Authors
C. Signorelli
G. Filardo
T. Bonanzinga
A. Grassi
S. Zaffagnini
M. Marcacci
Publication date
01-11-2016
Publisher
Springer Berlin Heidelberg
Published in
Knee Surgery, Sports Traumatology, Arthroscopy / Issue 11/2016
Print ISSN: 0942-2056
Electronic ISSN: 1433-7347
DOI
https://doi.org/10.1007/s00167-016-4158-2

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