中国组织工程研究 ›› 2025, Vol. 29 ›› Issue (34): 7261-7268.doi: 10.12307/2025.894

• 组织工程骨材料 tissue-engineered bone •    下一篇

Mg-Li-Gd合金与不锈钢髓内针植入固定大鼠股骨环形半缺损的比较

王景帅1,张晓彤2,张彦歌1,万泽东1,孔令伟1,曹海营1,金  宇1   

  1. 1承德医学院附属医院,河北省承德市   067000;2承德医学院,河北省承德市   067000
  • 收稿日期:2024-08-12 接受日期:2024-10-16 出版日期:2025-12-08 发布日期:2025-01-17
  • 通讯作者: 金宇,主任医师,承德医学院附属医院创伤骨科,河北省承德市 067000
  • 作者简介:王景帅,男,1993年生,河北省唐山市人,汉族,承德医学院在读硕士,主治医师,主要从事复杂骨折及骨缺损修复方面的研究。
  • 基金资助:
    河北省自然科学基金资助项目(可降解生物医用金属  C2022203003)

Comparison of Mg-Li-Gd alloy and stainless steel intramedullary nail for fixation of femoral annular hemi-defects in rats

Wang Jingshuai1, Zhang Xiaotong2, Zhang Yange1, Wan Zedong1, Kong Lingwei1, Cao Haiying1, Jin Yu1   

  1. 1Affiliated Hospital of Chengde Medical University, Chengde 067000, Hebei Province, China; 2Chengde Medical University, Chengde 067000, Hebei Province, China
  • Received:2024-08-12 Accepted:2024-10-16 Online:2025-12-08 Published:2025-01-17
  • Contact: Jin Yu, Chief physician, Affiliated Hospital of Chengde Medical University, Chengde 067000, Hebei Province, China
  • About author:Wang Jingshuai, Master candidate, Attending physician, Affiliated Hospital of Chengde Medical University, Chengde 067000, Hebei Province, China
  • Supported by:
    Natural Science Foundation of Hebei Province, No. C2022203003

摘要:


文题释义:

Mg-Li-Gd合金:是一种镁基合金,其中主要合金元素为锂(Li)和钆(Gd),这类合金因轻质和优异的机械性能而备受关注,常用于航空航天和汽车等需要轻量化和高强度材料的领域。
骨矿化:是指骨组织中矿物质的沉积过程,主要包括钙和磷酸盐的沉积,使骨骼变得坚硬并具有结构强度。骨矿化过程对于骨骼的发育、维持和修复至关重要。


背景:随着骨科植入物需求的增加,寻找具有良好生物相容性和降解性能的材料成为研究热点。Mg-Li-Gd合金具有良好的降解性、生物相容性与力学性能,为骨折愈合提供了理想的支持条件。

目的:评估Mg-Li-Gd合金植入物对大鼠骨愈合的影响。
方法:在28只SD大鼠右侧股骨中段外侧制作环形半缺损模型,随机分2组处理:不锈钢组使用不锈钢髓内针进行内固定,镁合金组使用Mg-Li-Gd合金髓内针进行内固定,每组14只。术后2,8,14周,进行右侧股骨X射线片与Micro-CT检查,以及右侧股骨苏木精-伊红染色、免疫组化染色与Western Blot检测。

结果与结论:①X射线片:术后2周,两组截骨线均清晰,镁合金组髓内针密度与骨组织密度相接近,不锈钢组髓内针密度高于骨组织;术后8周,两组截骨线均已模糊,镁合金组髓内针已发生腐蚀降解;术后14周,两组截骨线均已消失,镁合金组髓内针进一步腐蚀降解。②Micro-CT:术后2周,两组骨痂开始形成;术后8周,不锈钢组进入骨痂重塑阶段,骨缺损部位形成较为致密的骨结构,镁合金组骨缺损部位呈现明显的骨痂增生;术后14周,不锈钢组表现为成熟的骨重塑过程,骨缺损部位形成厚实的皮质骨,镁合金组形成较薄的皮质骨。③苏木精-伊红染色:术后2周,镁合金组可见大量成骨细胞、骨细胞和少量的破骨细胞及骨小梁结构,不锈钢组可见相对较少的成骨细胞和骨细胞;术后8周,镁合金组可见大量成骨细胞、骨细胞及成熟骨小梁结构,不锈钢组可见大量骨细胞及板状骨;术后14周,镁合金组可见板状骨,不锈钢组可见成熟的骨组织。④免疫组化染色与Western Blot检测:相同时间点下,镁合金组骨形态发生蛋白2、骨钙素和RUNX2蛋白表达均高于不锈钢组。⑤结果表明,相较于不锈钢材料,Mg-Li-Gd合金在促进骨折愈合结构形成方面无明显优势。

https://orcid.org/0009-0006-0692-6498 (王景帅) 

中国组织工程研究杂志出版内容重点:生物材料;骨生物材料;口腔生物材料;纳米材料;缓释材料;材料相容性;组织工程

关键词: 镁合金, 骨缺损, 生物相容性, 可降解材料, 骨愈合, Mg-Li-Gd合金, 股骨环形半缺损模型, 骨矿化

Abstract: BACKGROUND: With the increasing demand for orthopedic implants, the search for materials with good biocompatibility and degradability has become a research hotspot. Magnesium-lithium-gadolinium (Mg-Li-Gd) alloy has good degradability, biocompatibility, and mechanical properties, providing ideal supporting conditions for fracture healing. 
OBJECTIVE: To evaluate the effects of Mg-Li-Gd alloy implants on bone healing in rats. 
METHODS: A circular half-defect model was made on the lateral side of the right mid-femoral segment in 28 SD rats, and the rats were randomly divided into two groups. The stainless steel group was fixed with a stainless steel intramedullary nail, and the magnesium alloy group was fixed with an Mg-Li-Gd alloy intramedullary nail, with 14 rats in each group. At 2, 8, and 14 weeks after surgery, right femur X-ray and Micro-CT examinations, as well as hematoxylin-eosin staining, immunohistochemical staining, and western blot assay were performed. 
RESULTS AND CONCLUSION: (1) X-ray film: At 2 weeks after surgery, the osteotomy lines of both groups were clear, the density of the intramedullary nail in the magnesium alloy group was close to that of bone tissue, and the density of the intramedullary nail in the stainless steel group was higher than that of bone tissue. At 8 weeks after surgery, the osteotomy lines of both groups were blurred, and the intramedullary nail in the magnesium alloy group had corroded and degraded. At 14 weeks after surgery, the osteotomy lines of both groups disappeared, and the intramedullary nail in the magnesium alloy group further corroded and degraded. (2) Micro-CT: At 2 weeks after surgery, callus began to form in both groups; 8 weeks after surgery, the stainless steel group entered the callus remodeling stage, and a relatively dense bone structure was formed at the bone defect site, and the magnesium alloy group showed obvious callus hyperplasia at the bone defect site. At 14 weeks after surgery, the stainless steel group showed a mature bone remodeling process, and thick cortical bone was formed at the bone defect site, and thinner cortical bone was formed in the magnesium alloy group. (3) Hematoxylin-eosin staining: At 2 weeks after surgery, a large number of osteoblasts, osteocytes, a small number of osteoclasts and trabecular structures were observed in the magnesium alloy group, while relatively few osteoblasts and osteocytes were observed in the stainless steel group. At 8 weeks after surgery, a large number of osteoblasts, osteocytes, and mature trabecular structures were observed in the magnesium alloy group, while a large number of osteocytes and lamellar bones were observed in the stainless steel group. At 14 weeks after surgery, lamellar bones were observed in the magnesium alloy group, while mature bone tissue was observed in the stainless steel group. (4) Immunohistochemical staining and western blot assay: At the same time point, the expression levels of bone morphogenetic protein 2, osteocalcin, and RUNX2 proteins in the magnesium alloy group were higher than those in the stainless steel group. (5) The results showed that compared with stainless steel materials, Mg-Li-Gd alloy had no obvious advantage in promoting the formation of fracture healing structure.

Key words: magnesium alloy, bone defect, biocompatibility, degradable material, bone healing, Mg-Li-Gd alloy, femoral annular hemi-defect model, bone mineralization

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