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Erschienen in: Archives of Orthopaedic and Trauma Surgery 1/2018

26.10.2017 | Knee Arthroplasty

Effects of tibial baseplate shape on rotational alignment in total knee arthroplasty: three-dimensional surgical simulation using osteoarthritis knees

verfasst von: Yuan Ma, Hideki Mizu-uchi, Ken Okazaki, Tetsuro Ushio, Koji Murakami, Satoshi Hamai, Yukio Akasaki, Yasuharu Nakashima

Erschienen in: Archives of Orthopaedic and Trauma Surgery | Ausgabe 1/2018

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Abstract

Introduction

Placement of tibial component is expected to fulfill both maximum surface coverage and recommended anterior–posterior (AP) alignment in total knee arthroplasty (TKA). The purpose of this study is to evaluate the effect of the tibial baseplate shape on AP axis.

Materials and methods

Virtual surgery of TKA was performed with three-dimensional bone models reconstructed from 77 osteoarthritis varus knees. Two differently designed tibial baseplates, symmetrically and anatomically, were set to the cut surface under posterior slopes of 0°, 3°, and 7°. The AP axes were defined by connecting the geometrical center of the cut surface with the medial edge (axis MED) and medial 1/3 (axis 1/3MED) of patella tendon attachment. We evaluated the overhang rates as well as the most fitting AP axis which passes through the geometric center.

Results

Overhang rates when aligned to axis MED were 12–25% for the symmetrical-type group and 13–22% for the anatomical-type group. Overhang rates when aligned to axis 1/3MED were 42–48% for the symmetrical-type group and 3–7% for the anatomical-type group. The most fitting AP axis of tibial baseplate was located 2.5° external to axis MED for the symmetrical-type group and around 3.3° internal to axis 1/3MED for the anatomical-type group.

Conclusions

Symmetrically or anatomically designed tibial baseplates have their own favored AP axis and specific performance on coverage. When aligned to axis 1/3MED, anatomically designed tibial baseplates will effectively lower the mismatch rates compared to a symmetrically designed tibial baseplate. Orthopaedic surgeons are expected to place the tibial components to the cut surface during TKA with full understanding of the features between different baseplate designs, AP axes, and posterior slopes for an ideal tibial rotational position.
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Metadaten
Titel
Effects of tibial baseplate shape on rotational alignment in total knee arthroplasty: three-dimensional surgical simulation using osteoarthritis knees
verfasst von
Yuan Ma
Hideki Mizu-uchi
Ken Okazaki
Tetsuro Ushio
Koji Murakami
Satoshi Hamai
Yukio Akasaki
Yasuharu Nakashima
Publikationsdatum
26.10.2017
Verlag
Springer Berlin Heidelberg
Erschienen in
Archives of Orthopaedic and Trauma Surgery / Ausgabe 1/2018
Print ISSN: 0936-8051
Elektronische ISSN: 1434-3916
DOI
https://doi.org/10.1007/s00402-017-2828-2

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