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Knee Surgery, Sports Traumatology, Arthroscopy

Published in:

01-12-2014 | Knee

Toe-out angle changes after total knee arthroplasty in patients with varus knee osteoarthritis

Authors: Masayuki Tazawa, Makoto Sohmiya, Naoki Wada, Irma Ruslina Defi, Kenji Shirakura

Published in: Knee Surgery, Sports Traumatology, Arthroscopy | Issue 12/2014

Abstract

Purpose

Toeing-out is a commonly proposed kinematic variable that has been suggested to reduce external knee adduction moment. Analyses of the toe-out angle after total knee arthroplasty (TKA) are useful for obtaining a proper understanding of the abnormal gait caused by varus knee osteoarthritis (OA), as well as performing rehabilitation after arthroplasty. Changes in the toe-out angle after arthroplasty have not yet been defined or analysed.

Methods

The study population consisted of 32 knees in 32 patients with varus knee OA who underwent TKA. The femorotibial angle was evaluated on standing anteroposterior radiographs before and after arthroplasty. The subjects underwent three-dimensional motion capture analyses to measure gait parameters (walking speed, cadence, stride length, step length, step width and the relative length of the single-limb support (SLS) percentage of one gait cycle) and the maximal hip adduction angle in the stance phase, the trunk lean angle in the coronal plane and the toe-out angle before and 4 weeks after arthroplasty.

Results

The femorotibial angle on the side of arthroplasty improved after surgery. Among the measured gait parameters, only the SLS percentage increased significantly. The hip adduction angle and toe-out angle on the side of arthroplasty increased significantly after surgery.

Conclusions

The knee alignment and hip adduction angle in the coronal plane and SLS phase were normalized after arthroplasty. The increase in the toe-out angle after arthroplasty may be attributable to the restoration of a normal knee alignment. These findings contribute to obtaining a proper understanding of the abnormal gait caused by varus knee OA and are useful for orthopaedic surgeons and rehabilitation therapists when treating patients after arthroplasty.

Level of evidence

Prospective study, Level II.

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Title: Toe-out angle changes after total knee arthroplasty in patients with varus knee osteoarthritis
Authors: Masayuki Tazawa
Makoto Sohmiya
Naoki Wada
Irma Ruslina Defi
Kenji Shirakura
Publication date: 01-12-2014
Publisher: Springer Berlin Heidelberg
Published in: Knee Surgery, Sports Traumatology, Arthroscopy / Issue 12/2014
Print ISSN: 0942-2056
Electronic ISSN: 1433-7347
DOI: https://doi.org/10.1007/s00167-014-2841-8

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Toe-out angle changes after total knee arthroplasty in patients with varus knee osteoarthritis

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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