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BMC Musculoskeletal Disorders
Published in: BMC Musculoskeletal Disorders 1/2018

Open Access 01-12-2018 | Research article

Quantitative analysis of near-implant magnesium accumulation for a Si-containing coated AZ31 cage from a goat cervical spine fusion model

Authors: Fan Zhang, Haocheng Xu, Hongli Wang, Fang Geng, Xiaosheng Ma, Minghao Shao, Shun Xu, Feizhou Lu, Jianyuan Jiang

Published in: BMC Musculoskeletal Disorders | Issue 1/2018

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Abstract

Background

Magnesium (Mg) released from Mg-based implants degradation is believed to be effective in improving osteogenesis, however, studies focusing on Mg-based interbody cages are limited and fusion success was never reported. As excessive Mg accumulation can inhibit new bone formation, this study is designed to explain the possible reasons for the fusion failure of Mg-based cages by analyzing the relationships between the intervertebral Mg accumulation and the resulting interbody fusion.

Methods

The experimental cage was consisted of magnesium alloy (AZ31) substrate and Silicon (Si) -containing coating. C3/C4 and C5/C6 of 24 goats were implanted with cage or autologous iliac crest bone graft (Control group), which were analyzed at 3, 6, 12, and 24 weeks post-operatively. Intervertebral Mg concentrations, Mg-related Calcium (Ca)/ Phosphorus (P) ratios, radiological evaluations and histological findings were recorded for analyzing the relationships between the three of cage corrosion, Mg accumulation, and interbody fusion.

Results

Intervertebral Mg levels were significantly increased after cage implantation, especially in the areas that were closer to the cages at 3 weeks post-operatively, and these increased concentrations could persist up to 12 weeks post-operatively, indicating a relatively rapid corrosion process. Significantly lower Mg levels were only found at 24 weeks post-operatively, but these levels were still higher than those of the control group. In addition, Mg was found to be widely distributed at the intervertebral space since high Mg concentrations could even be detected at the posterior boundary of the vertebral body. Under this Mg accumulation profile, interbody fusion was not achieved, as indicated by the decreased Ca/P ratios, low CT fusion scores and negative histological results.

Conclusions

Intervertebral excessive Mg accumulation might be the primary reason for interbody fusion failure. Quantitative Mg analysis can offer insight into the association between cage degeneration and biological response.
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Metadata
Title
Quantitative analysis of near-implant magnesium accumulation for a Si-containing coated AZ31 cage from a goat cervical spine fusion model
Authors
Fan Zhang
Haocheng Xu
Hongli Wang
Fang Geng
Xiaosheng Ma
Minghao Shao
Shun Xu
Feizhou Lu
Jianyuan Jiang
Publication date
01-12-2018
Publisher
BioMed Central
Published in
BMC Musculoskeletal Disorders / Issue 1/2018
Electronic ISSN: 1471-2474
DOI
https://doi.org/10.1186/s12891-018-2027-5

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