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Published in: Archives of Orthopaedic and Trauma Surgery 3/2018

01-03-2018 | Orthopaedic Surgery

New angle measurement device to control the posterior tibial slope angle in medial opening wedge high tibial osteotomy

Authors: Hiroyasu Ogawa, Kazu Matsumoto, Haruhiko Akiyama

Published in: Archives of Orthopaedic and Trauma Surgery | Issue 3/2018

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Abstract

Introduction

Medial opening wedge high tibial osteotomy has been associated with an unintentional increase in the posterior tibial slope angle. We aimed to evaluate the effectiveness of a novel bone spreader angle rod to maintain the native posterior tibial slope angle in medial opening wedge high tibial osteotomy.

Materials and methods

Data from 92 consecutive knees in 83 patients who underwent medial opening wedge high tibial osteotomy for knee osteoarthritis between March 2015 and June 2016 were analysed. The osteotomy was performed without the use of a bone spreader angle rod in the first 50 cases (control group) and with the use of the angle rod in the subsequent 42 cases (angle rod group). The wedge insertion angle, defined as the angle between a line drawn along the posterior aspect of the wedge spacer and a line tangential to the posterior aspect of the femoral condyles, and the posterior tibial slope angle were evaluated on pre- and postoperative lateral knee radiographs and postoperative computed tomography images.

Results

Wedge insertion angle showed that wedge spacers were inserted in a more direct horizontal direction in the angle rod group than in the control group (16.0 ± 8.8° and 23.0 ± 10.0°, respectively, P < 0.001). The pre- to postoperative change in posterior tibial slope angle was significantly smaller in the angle rod group (0.6 ± 1.6°) compared to that in the control group (3.2 ± 3.2°; P < 0.0001). A change of posterior tibial slope angle > 3° (outlier) was identified in 1 case (2.4%) in the angle rod group compared to 27 cases in the control group (54.0%).

Conclusions

The direct horizontal insertion of wedge spacers with the assistance of our novel bone spreader angle rod maintains the native posterior tibial slope angle better than conventional methods.

Level of evidence

IV.
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Metadata
Title
New angle measurement device to control the posterior tibial slope angle in medial opening wedge high tibial osteotomy
Authors
Hiroyasu Ogawa
Kazu Matsumoto
Haruhiko Akiyama
Publication date
01-03-2018
Publisher
Springer Berlin Heidelberg
Published in
Archives of Orthopaedic and Trauma Surgery / Issue 3/2018
Print ISSN: 0936-8051
Electronic ISSN: 1434-3916
DOI
https://doi.org/10.1007/s00402-017-2846-0

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