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Knee Surgery, Sports Traumatology, Arthroscopy
Published in: Knee Surgery, Sports Traumatology, Arthroscopy 5/2018

Open Access 01-05-2018 | Knee

Articular surface mounted navigated total knee arthroplasty improves the reliability of component alignment

Authors: N. D. Clement, D. MacDonald, A. G. Burgess, C. R. Howie

Published in: Knee Surgery, Sports Traumatology, Arthroscopy | Issue 5/2018

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Abstract

Purpose

The primary aim was to compare the early knee-specific functional outcome after articular surface mounted (ASM) navigation with non-navigated TKA. The secondary aims were to compare general physical and mental health improvement, patient satisfaction, and reliability of component alignment in the sagittal and coronal planes between ASM navigated TKA with that of non-navigated TKA.

Methods

Prospective functional outcome and radiographic data were collect for 123 patients undergoing ASM navigation and 172 patients undergoing non-navigated TKA by a high volume single surgeon. Pre-operative and one-year Oxford knee score (OKS) and short form (SF-) 12 scores were collected. Patient satisfaction was also assessed at one year. Implant position was assessed on post-operative radiographs (alpha, beta, gamma, and sigma angles) by a blinded observer.

Results

There was no significant difference for improvement in OKS, SF-12 physical or mental components, or satisfaction between the groups one year following surgery. The non-navigation group was significantly more likely to have outliers (greater than 3 degrees) in femoral varus/valgus coronal alignment [odds ratio (OR) 4.5, 95% confidence interval (CI) 1.0–20.7, p = 0.049] and for posterior tibial slope (OR 8.3, 95% CI 1.1–65.0, p = 0.03).

Conclusions

ASM navigation significantly reduces the number of outliers for the femoral and tibial components when compared to conventional non-navigation alignment. However, the short-term functional outcome is not influenced by the surgical technique used. If the surgeon wants to reduce their number of outliers, then ASM navigation should be considered but the overall functional outcome in the short term is not influenced.

Level of evidence

III Therapeutic investigation, retrospective cohort study.
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Metadata
Title
Articular surface mounted navigated total knee arthroplasty improves the reliability of component alignment
Authors
N. D. Clement
D. MacDonald
A. G. Burgess
C. R. Howie
Publication date
01-05-2018
Publisher
Springer Berlin Heidelberg
Published in
Knee Surgery, Sports Traumatology, Arthroscopy / Issue 5/2018
Print ISSN: 0942-2056
Electronic ISSN: 1433-7347
DOI
https://doi.org/10.1007/s00167-017-4433-x

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