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Published in: Archives of Orthopaedic and Trauma Surgery 3/2020

01-03-2020 | Knee Arthroplasty

The entry point of intramedullary tibia cutting guide should vary according to the individual tibia morphology in TKA

Authors: Sung-Mok Oh, Seong-Il Bin, Bum-Sik Lee, Jong-Min Kim

Published in: Archives of Orthopaedic and Trauma Surgery | Issue 3/2020

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Abstract

Introduction

In total knee arthroplasty (TKA) using the intramedullary tibial cutting guide (IMTCG), the positioning of the IMTCG is important for accurate tibial bone resection. The aim of this study was to evaluate the ideal entry point of IMTCG and affecting radiologic factors.

Materials and methods

From May 2017 to February 2018, 91 consecutive TKAs for osteoarthritis were included. From preoperative full-length radiographs, we measured the medial proximal tibia angle (MPTA), lateral distal tibia angle (LDTA), tibial bowing angle (TBA), medial to lateral width of the tibial plateau, tibial length, and ideal coronal entry point. In preoperative short knee lateral radiographs, we measured the anterior to posterior length of the tibial plateau, tibial posterior slope angle (TPSA), metaphysio-diaphyseal angle (MDA), and ideal sagittal entry point. The ideal coronal and sagittal entry points were defined as the points crossing the tibial plateau and tibial anatomical axis on the coronal and sagittal radiographs, respectively.

Results

The ideal entry point was 51.4 ± 4.3% (SD) from the medial margin and 27.0 ± 5.8% (SD) from the anterior margin of the tibial plateau. However, the range varied from 39.8 to 60.5% on the coronal plane and from 9.6 to 37.7% on the sagittal plane, respectively. As the MPTA (rho = − 0.490) and TBA (rho = − 0.433) were increased, the coronal entry point moved medially. As TPSA (rho = − 0.761) and MDA (rho = − 0.495) were increased, the sagittal entry point moved anteriorly.

Conclusions

The ideal entry point of IMTCG should vary according to the individual tibial morphology.
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Metadata
Title
The entry point of intramedullary tibia cutting guide should vary according to the individual tibia morphology in TKA
Authors
Sung-Mok Oh
Seong-Il Bin
Bum-Sik Lee
Jong-Min Kim
Publication date
01-03-2020
Publisher
Springer Berlin Heidelberg
Published in
Archives of Orthopaedic and Trauma Surgery / Issue 3/2020
Print ISSN: 0936-8051
Electronic ISSN: 1434-3916
DOI
https://doi.org/10.1007/s00402-019-03324-2

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