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Archives of Orthopaedic and Trauma Surgery

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Open Access 01-10-2017 | Knee Arthroplasty

Varus–valgus stability at 90° flexion correlates with the stability at midflexion range more widely than that at 0° extension in posterior-stabilized total knee arthroplasty

Authors: Kazunori Hino, Tatsuhiko Kutsuna, Kunihiko Watamori, Hiroshi Kiyomatsu, Yasumitsu Ishimaru, Jun Takeba, Seiji Watanabe, Yoshitaka Shiraishi, Hiromasa Miura

Published in: Archives of Orthopaedic and Trauma Surgery | Issue 10/2017

Abstract

Introduction

Midflexion stability can potentially improve the outcome of total knee arthroplasty (TKA). The purpose of this study was to evaluate the correlation between varus–valgus stability at 0° of extension and 90° of flexion and that at the midflexion range in posterior-stabilized (PS)-TKA.

Materials and methods

Forty-three knees that underwent PS-TKA were evaluated. Manual mild passive varus–valgus stress was applied to the knees, and the postoperative maximum varus–valgus stability was measured every 10° throughout range of motion, using a navigation system. Correlations between the stability at 0°, 90° of flexion, and that at each midflexion angle were evaluated using Spearman’s correlation coefficients.

Results

The stability of 0° modestly correlated with that of 10°–20°, but it did not significantly correlate with that of 30°–80°. However, the stability of 90° strongly correlated with that of 60°–80°, modestly correlated with that of 40°–50°, weakly correlated with that of 20°–30°, and did not correlate with that of 10°.

Conclusions

The present study confirmed the importance of acquiring stability at 90° flexion to achieve midflexion stability in PS-TKA. However, initial flexion stability did not strongly correlate with the stability at either 0° or 90°. Our findings can provide useful information for understanding varus–valgus stability throughout the range of motion in PS-TKA. Attention to soft tissue balancing is necessary to stabilize a knee at the initial flexion range in PS-TKA.

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Title: Varus–valgus stability at 90° flexion correlates with the stability at midflexion range more widely than that at 0° extension in posterior-stabilized total knee arthroplasty
Authors: Kazunori Hino
Tatsuhiko Kutsuna
Kunihiko Watamori
Hiroshi Kiyomatsu
Yasumitsu Ishimaru
Jun Takeba
Seiji Watanabe
Yoshitaka Shiraishi
Hiromasa Miura
Publication date: 01-10-2017
Publisher: Springer Berlin Heidelberg
Published in: Archives of Orthopaedic and Trauma Surgery / Issue 10/2017
Print ISSN: 0936-8051
Electronic ISSN: 1434-3916
DOI: https://doi.org/10.1007/s00402-017-2779-7

At a glance: The ONWARDS insulin icodec trials

Springer Medicine

Varus–valgus stability at 90° flexion correlates with the stability at midflexion range more widely than that at 0° extension in posterior-stabilized total knee arthroplasty

Abstract

Introduction

Materials and methods

Results

Conclusions

At a glance: The ONWARDS insulin icodec trials

Springer Medicine

Abstract

Introduction

Materials and methods

Results

Conclusions

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