| ZHANG Yue,BIAN Yan-yan,MA Dong-lin,HUANG Nan,ZHANG Jian-guo,LENG Yong-xiang.Advances in Research on Surface Modification to Reduce the Incidence of Clinical Complications of Growing Rods[J],50(12):181-190 |
| Advances in Research on Surface Modification to Reduce the Incidence of Clinical Complications of Growing Rods |
| Received:March 08, 2021 Revised:April 14, 2021 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2021.12.019 |
| KeyWord:growing rods surface modification pedicle screw extraction rod fracture wear |
| Author | Institution |
| ZHANG Yue |
School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu , china |
| BIAN Yan-yan |
Peking Union Medical College Hospital, Beijing , China |
| MA Dong-lin |
School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu , china |
| HUANG Nan |
School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu , china |
| ZHANG Jian-guo |
Peking Union Medical College Hospital, Beijing , China |
| LENG Yong-xiang |
School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu , china |
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| Abstract: |
| The growing rod is a kind of medical device widely used in the corrective therapy of patients with early-onset scoliosis (EOS). In this paper, the clinical applications of growing rods, such as single growing rod, dual growing rod and Shilla growing rod, made of titanium alloy or cobalt chromium alloy, in the EOS treatment were introduced firstly. In addition, the problems such as rods breakage, pedicle screw extraction, and metal ion enrichment, which were caused by metal fatigue, screw loosening, wear, and corrosion during growing rods applied in vivo, were summarized. The related complications including allergic reaction, inflammatory response and osteolysis caused by such problems were also clarified. In order to reduce the incidence of clinical complications, researchers at home and abroad have improved the metal rod of growing rod system by surface modification, such as peening, micro arc oxidation, plasma spray and physical vapor deposition. These researches show as follows:The surface hardness and stress of metal rods of growing rod system can be improved by laser shock peening and cavitation peening, thus the fretting fatigue property can be improved to avoid metal rod fracture. Peening, micro arc oxidation, and plasma spray can promote the osseointegration of pedicle screw of growing rod system and bone interface, and enhance the pedicle screw-bone strength. The wear resistance and corrosion resistance of the growing rods can be enhanced by physical vapor deposition, which inhibits the metal ion release. After surface modification, the biocompatibility of the growing rods was improved, and the incidence of related complications such as allergic reaction, inflammatory response and osteolysis was reduced. |
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