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International Journal of Computer Assisted Radiology and Surgery

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18-03-2019 | Original Article

Optimization of electronic prescription for parallel external fixator based on genetic algorithm

Authors: Xishuai Zhang, Hao Sun, Jianwen Chen, Yue Guo, Yinguang Zhang, Zhenhui Sun, Tao Wang, Mengting Wei, Yan Zhang, Lingling Chen

Published in: International Journal of Computer Assisted Radiology and Surgery | Issue 5/2019

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Abstract

Purpose

For the parallel external fixator, there are some defects, such as uneven distraction rate, unbearable pain and uncontrollable movement trajectory in practical clinical applications. In order to solve the problems, a new deformity correction algorithm, which is used to calculate the elongation of the six struts, is developed. Meanwhile, the corresponding computer software for getting the electronic prescription is developed.

Methods

First, the trajectory of the moving bone is planned by Cartesian coordinate path control. Next, the prescription is obtained from the trajectory by the inverse pose solution algorithm. Finally, the genetic algorithm is utilized to optimize the achieved prescription. From the year of 2015 to 2018, twenty-three patients with complicated tibia deformity are treated by using parallel external fixator and the developed computer software. All patients have standing, patella-forward, full-length post-operative AP and lateral radiographs of the lower limbs with the complete proximal ring for getting the deformity parameters and frame parameters. These parameters are input into the computer software to calculate a daily prescription schedule for strut adjustment. Radiographs are taken regularly to determine the effects of recovery during the correction process.

Results

The mean time of follow-up is 18 months (range 11–40 months). All patients reach the requirements for deformity correction, and their symptoms and appearance are improved significantly. No cases of wound infections or complications occur, and no severe pain came as well during the correction process.

Conclusions

By using the computer-aided parallel external fixator for the correction of lower limb deformities, satisfactory outcomes can be achieved. Hence, this method greatly improved the treatment of these patients in a clinical application.

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Title: Optimization of electronic prescription for parallel external fixator based on genetic algorithm
Authors: Xishuai Zhang
Hao Sun
Jianwen Chen
Yue Guo
Yinguang Zhang
Zhenhui Sun
Tao Wang
Mengting Wei
Yan Zhang
Lingling Chen
Publication date: 18-03-2019
Publisher: Springer International Publishing
Published in: International Journal of Computer Assisted Radiology and Surgery / Issue 5/2019
Print ISSN: 1861-6410
Electronic ISSN: 1861-6429
DOI: https://doi.org/10.1007/s11548-019-01931-3

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Abstract

Purpose

Methods

Results

Conclusions

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