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Knee Surgery, Sports Traumatology, Arthroscopy
Published in: Knee Surgery, Sports Traumatology, Arthroscopy 3/2021

01-03-2021 | Knee Osteoarthritis | KNEE

Coronal shaft bowing of the femur affects varus inclination of the surgical transepicondylar axis in varus knee osteoarthritis

Authors: Shuntaro Nejima, Ken Kumagai, Hideo Kobayashi, Shunsuke Yamada, Tomotaka Akamatsu, Takahiro Ogino, Masaichi Sotozawa, Yutaka Inaba

Published in: Knee Surgery, Sports Traumatology, Arthroscopy | Issue 3/2021

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Abstract

Purpose

This study investigated the relationship between femoral shaft bowing and the orientation of the surgical transepicondylar axis (TEA) in the coronal plane in varus knee osteoarthritis (OA).

Methods

A total of 82 knees scheduled to undergo total knee arthroplasty (TKA) for the treatment of varus knee OA were enrolled. The hip–knee-ankle angle (HKA) was measured preoperatively on anteroposterior whole-leg standing radiographs. The lateral angle between the TEA and the mechanical axis of the femur (MA-TEA) was measured in the coronal plane from preoperative computed tomography (CT) images. Femoral shaft bowing was measured on CT images. Pearson’s correlation coefficient was used to examine the correlation of the MA-TEA with the HKA and femoral shaft bowing.

Results

The MA-TEA correlated negatively with the HKA (r = − 0.321, P < 0.01) and positively with femoral shaft bowing (r = 0.415, P < 0.01).

Conclusions

The TEA changed to varus as femoral shaft bowing increased in patients with varus knee OA. This suggests that the TEA is not always the centre of the rotational axis of the femur after TKA. In addition, the TEA may not be useful as a consistent parameter in the coronal plane in patients with increasing femoral shaft bowing.

Level of evidence

III.
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Metadata
Title
Coronal shaft bowing of the femur affects varus inclination of the surgical transepicondylar axis in varus knee osteoarthritis
Authors
Shuntaro Nejima
Ken Kumagai
Hideo Kobayashi
Shunsuke Yamada
Tomotaka Akamatsu
Takahiro Ogino
Masaichi Sotozawa
Yutaka Inaba
Publication date
01-03-2021
Publisher
Springer Berlin Heidelberg
Published in
Knee Surgery, Sports Traumatology, Arthroscopy / Issue 3/2021
Print ISSN: 0942-2056
Electronic ISSN: 1433-7347
DOI
https://doi.org/10.1007/s00167-020-06025-1

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