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Journal of Orthopaedic Surgery and Research

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Open Access 01-12-2024 | Scoliosis | Research article

A Novel growth guidance system for early onset scoliosis: a preliminary in vitro study

Authors: You Du, Yanyan Bian, Yiwei Zhao, Yang Yang, Guanfeng Lin, Bingtai Han, Haoran Zhang, Chenkai Li, Xiaohan Ye, Zhiyi Li, Jianguo Zhang, Shengru Wang

Published in: Journal of Orthopaedic Surgery and Research | Issue 1/2024

Abstract

Purpose

The purpose of the study was to describe a novel growth guidance system, which can avoid metal debris and reduce the sliding friction forces, and test the durability and glidability of the system by in vitro test.

Method

Two major modifications were made to the traditional Shilla system, including the use of ultra-high molecular weight polyethylene (UHMWPE) gaskets to avoid direct contact between the screw and rod, and polishing the surface of the sliding part of the rod. We tested the durability of the system by a fatigue test, which the samples were test on the MTS system for a 10 million cycle of a constant displacement. Pre and post-testing involved weighing the UHMWPE gaskets and observing the wear conditions. The sliding ability were measured by a sliding displacement test. The maximum sliding displacement of the system was measured after a 300 cycles of dynamic compressive loads in a sinusoidal waveform.

Results

After the fatigue test, all the UHMWPE gaskets samples showed some of the fretting on the edge of the inner sides, but its still isolated and avoided the friction between the screws and rods. There was no production of metallic fretting around the sliding screws and rods. The average wear mass of the UHMWPE gaskets was 0.002 ± 0.001 g, less than 1.7% of the original mass. In the sliding test, the novel growth guidance system demonstrated the best sliding ability, with an average maximum sliding distance(AMSD) of 35.75 ± 5.73 mm, significantly better than the group of the traditional Shilla technique(AMSD 3.65 ± 0.46 mm, P < 0.0001).

Conclusion

In conclusion, we modified the Shilla technique and designed a novel growth guidance system by changing the friction interface of sliding screw and rod, which may significantly reduce the metallic debris and promote spine growth. The fatigue test and sliding dislocation test demonstrated the better durability and glidability of the system. An in vivo animal experiment should be performed to further verify the system.

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Title: A Novel growth guidance system for early onset scoliosis: a preliminary in vitro study
Authors: You Du
Yanyan Bian
Yiwei Zhao
Yang Yang
Guanfeng Lin
Bingtai Han
Haoran Zhang
Chenkai Li
Xiaohan Ye
Zhiyi Li
Jianguo Zhang
Shengru Wang
Publication date: 01-12-2024
Publisher: BioMed Central
Keywords: Scoliosis
Fatigue
Published in: Journal of Orthopaedic Surgery and Research / Issue 1/2024
Electronic ISSN: 1749-799X
DOI: https://doi.org/10.1186/s13018-024-04720-0

Keynote webinar | Spotlight on medication adherence

Springer Medicine

A Novel growth guidance system for early onset scoliosis: a preliminary in vitro study

Abstract

Purpose

Method

Results

Conclusion

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Abstract

Purpose

Method

Results

Conclusion

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