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Knee Surgery, Sports Traumatology, Arthroscopy
Published in: Knee Surgery, Sports Traumatology, Arthroscopy 3/2014

01-03-2014 | Knee

The radiological outcomes of patient-specific instrumentation versus conventional total knee arthroplasty

Authors: Jerry Yongqiang Chen, Seng Jin Yeo, Andy Khye Soon Yew, Darren Keng Jin Tay, Shi-Lu Chia, Ngai Nung Lo, Pak Lin Chin

Published in: Knee Surgery, Sports Traumatology, Arthroscopy | Issue 3/2014

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Abstract

Purpose

The aim of this study was to investigate the post-operative radiological outcomes of patient-specific instrumentation (PSI) surgery versus conventional total knee arthroplasty (TKA).

Methods

Sixty patients scheduled for a primary TKA were prospectively divided into PSI or conventional technique. Coronal and sagittal radiographic long limb films were taken post-operatively. The accepted values for normal alignment were 180° ± 3° for hip-knee-ankle angle; 90° ± 3° for coronal femoral component angle or coronal tibia component angle; 0° to 3° flexion for sagittal femoral component angle and 0° to 7° posterior slope for sagittal tibia component angle.

Results

For hip-knee-ankle angle, there were 21 % more outliers in the PSI group compared to the conventional group (p = 0.045). Most of these outliers had valgus deformity in the PSI group and varus deformity in the conventional group (p = 0.045). For implant placement, there was no difference in the proportion of outliers between the two groups. There was also no difference in the duration of surgery.

Conclusions

This study showed that PSI surgery is associated with a larger proportion of outliers for lower limb alignment. PSI surgery as an alternative to conventional TKA is not advisable.

Level of evidence

II.
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Metadata
Title
The radiological outcomes of patient-specific instrumentation versus conventional total knee arthroplasty
Authors
Jerry Yongqiang Chen
Seng Jin Yeo
Andy Khye Soon Yew
Darren Keng Jin Tay
Shi-Lu Chia
Ngai Nung Lo
Pak Lin Chin
Publication date
01-03-2014
Publisher
Springer Berlin Heidelberg
Published in
Knee Surgery, Sports Traumatology, Arthroscopy / Issue 3/2014
Print ISSN: 0942-2056
Electronic ISSN: 1433-7347
DOI
https://doi.org/10.1007/s00167-013-2638-1

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