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Knee Surgery, Sports Traumatology, Arthroscopy

Published in:

01-11-2016 | Knee

Decreased extension gap and valgus alignment after implantation of total knee prosthesis in primary varus knees

Authors: Yukihide Minoda, Shigeru Nakagawa, Ryo Sugama, Tessyu Ikawa, Takahiro Noguchi, Masashi Hirakawa, Yoshio Matsui, Hiroaki Nakamura

Published in: Knee Surgery, Sports Traumatology, Arthroscopy | Issue 11/2016

Abstract

Purpose

It was hypothesised that implantation of a total knee prosthesis may change the size and shape of the joint gap. To test this hypothesis, a tensor device was used which was specifically designed to reproduce the conditions before and after implantation, including attachment of the polyethylene insert trial. This study aimed to compare the joint gaps before and after implantation of a total knee prosthesis using this new tensor device.

Methods

A total of 259 primary varus knees were included in this study. Knees were exposed using a medial parapatellar approach, and the anterior and posterior cruciate ligaments were resected. After the trial reduction, the intraoperative joint gap kinematics was measured using the tensor device.

Results

Implantation of a total knee prosthesis decreased the size of the extension joint gap and made it valgus, but did not influence the size or shape of the flexion joint gap.

Conclusions

The present findings suggest that the classical gap technique, which creates equal and rectangular extension and flexion joint gaps in the bone cutting surface, results in an imbalance between the extension and flexion joint gaps after implantation. To achieve equal and rectangular extension and flexion joint gaps after implantation, the prepared extension joint gap should be about 2 mm larger than the flexion joint gap and slightly varus before implantation in primary varus knees.

Level of evidence

Therapeutic study, Level II.

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Title: Decreased extension gap and valgus alignment after implantation of total knee prosthesis in primary varus knees
Authors: Yukihide Minoda
Shigeru Nakagawa
Ryo Sugama
Tessyu Ikawa
Takahiro Noguchi
Masashi Hirakawa
Yoshio Matsui
Hiroaki Nakamura
Publication date: 01-11-2016
Publisher: Springer Berlin Heidelberg
Published in: Knee Surgery, Sports Traumatology, Arthroscopy / Issue 11/2016
Print ISSN: 0942-2056
Electronic ISSN: 1433-7347
DOI: https://doi.org/10.1007/s00167-014-3381-y

2024 ASCO Annual Meeting

Springer Medicine

Decreased extension gap and valgus alignment after implantation of total knee prosthesis in primary varus knees

Abstract

Purpose

Methods

Results

Conclusions

Level of evidence

2024 ASCO Annual Meeting

Springer Medicine

Abstract

Purpose

Methods

Results

Conclusions

Level of evidence

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