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Knee Surgery, Sports Traumatology, Arthroscopy

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01-11-2016 | Knee

Rotational alignment in patient-specific instrumentation in TKA: MRI or CT?

Authors: Alcindo Silva, Elisabete Pinto, Ricardo Sampaio

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

Abstract

Purpose

To compare CT-guided and MRI-guided patient-specific instrumentation in total knee arthroplasty (TKA).

Methods

Forty-four patients underwent primary TKA using either CT-guided or MR-guided Signature™ patient-specific instrumentation. They were prospectively assigned into two groups: 23 patients into the MR-guided instrumentation (group A) and 21 patients into the CT-guided patient-specific instrumentation (group B). All patients underwent computed tomography of the operated knee in the first week after the surgery to measure the components rotation.

Results

The femoral component rotation was 0.0° (0.0, 1.0) in group A and 0.0° (−2.0, 1.0) in group B. The tibial component rotation was −16.0° (−19.0, −14.0) in group A and −15.0° (−18.0, −8.0) in group B. In both components, there were no significant differences between the two groups. The difference between the tibial component rotation and the neutral tibial rotation was similar in both groups [2.0° (−1.4, 4.0) in group A and 3.0° (−0.5, 5.0) in group B], but the dispersion around the median was different between the two groups, with the amplitude of the difference between tibial rotation and neutral position 9° (−3.0, 6.0) in group A and 27° (−9.0, 18.0) in group B.

Conclusions

MRI may be more accurate than CT using the Signature™ system when planning the surgical guides for TKA, with fewer patients with malrotation of the tibial component.

Level of evidence

II.

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Title: Rotational alignment in patient-specific instrumentation in TKA: MRI or CT?
Authors: Alcindo Silva
Elisabete Pinto
Ricardo Sampaio
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/s00167-014-3394-6

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Rotational alignment in patient-specific instrumentation in TKA: MRI or CT?

Abstract

Purpose

Methods

Results

Conclusions

Level of evidence

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Abstract

Purpose

Methods

Results

Conclusions

Level of evidence

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