中国组织工程研究 ›› 2019, Vol. 23 ›› Issue (18): 2800-2805.doi: 10.3969/j.issn.2095-4344.1731

• 组织工程骨及软骨材料 tissue-engineered bone and cartilage materials • 上一篇    下一篇

Micro-CT评价β-磷酸三钙/α-半水硫酸钙复合人工骨在脊柱多节段椎板间融合中的应用

梁茂华1,毛克亚2,夏  波1,刘  强1,唐佩福2,王继芳2 
  

  1. 1泰安市中心医院创伤手足外科,山东省泰安市  271000;2解放军总医院骨科,北京市  100853
  • 收稿日期:2019-02-19 出版日期:2019-06-28 发布日期:2019-06-28
  • 作者简介:梁茂华,男,1976年生,山东省泰安市人,博士,主治医师,主要从事运动医学损伤及生物材料方面的研究。
  • 基金资助:

    国家自然科学基金面上项目(51772328),项目负责人:毛克亚

Application of beta-tricalcium phosphate/alpha-calcium sulfate hemihydrate combined bone grafts in  multi-segment arthrodesis of spine: micro-CT evaluation

Liang Maohua1, Mao Keya2, Xia Bo1, Liu Qiang1, Tang Peifu2, Wang Jifang2
  

  1. 1Department of Traumatic Hand and Foot Surgery, Taian City Central Hospital, Taian 271000, Shandong Province, China; 2Department of Orthopedics, General Hospital of PLA, Beijing 100853, China
  • Received:2019-02-19 Online:2019-06-28 Published:2019-06-28
  • About author:Liang Maohua, MD, Attending physician, Department of Traumatic Hand and Foot Surgery, Taian City Central Hospital, Taian 271000, Shandong Province, China
  • Supported by:

    the National Natural Science Foundation of China (General Program), No. 51772328 (to MKY)

摘要:

文章快速阅读:

 

文题释义:
复合人工骨:实验所使用的复合人工骨,是利用无水乙醇对人体无害、能够在常温下自行挥发且不能与α-半水硫酸钙发生水化反应的特点,将其与α-半水硫酸钙、由牛松质骨经2次煅烧,保留了天然骨孔隙的β-磷酸三钙颗粒制成混悬液,在体温条件下温育使无水乙醇挥发完全,α-半水硫酸钙粉末进入β-磷酸三钙内部的孔隙内,黏附在β-磷酸三钙孔隙内部和孔壁上,使2种材料充分复合形成新型复合材料。
Micro-CT评价:Micro-CT是专用于小动物的计算机体层成像系统,不仅能够反映出骨标本或活体小动物(比如鼠等)整块骨的真正三维数据,而且能够对骨的微观结构进行数据分析,测量特定区域内骨及及植骨材料的矿物质含量、矿物质密度、体积分数、骨小梁厚度、骨小梁数量、骨小梁的排列趋向及骨小梁联通情况等结构特点,并作出定量分析。实验正是利用Micro-CT上述优势,对脊柱融合阶段进行三维重建影像学及定量分析。
 
 
背景:因受到理化性质的局限,单一使用一种人工材料难以满足临床植骨融合手术的要求,因此使用2种以上材料制备的复合人工骨更符合临床应用要求,是近些年的研究热点。
目的:应用Micro-CT评价β-磷酸三钙/α-半水硫酸钙复合人工骨在兔胸椎多节段后外侧植骨融合模型中新骨的形成及材料降解。
方法:取36只新西兰大白兔(解放军总医院医学实验动物中心提供),去除T4-8椎体上、下关节突关节、双侧椎板和横突,将β-磷酸三钙/α-半水硫酸钙复合人工骨植于T4-8椎体左侧椎板后外侧(实验组),自体骨植于T4-8椎体右侧椎板后外侧(对照组)。术后4,8,12周末取出整段胸椎,进行Micro-CT扫描,观察两侧融合块的形态学变化,分析实验组总骨矿物质含量、组织矿物质含量及材料体积分数。实验方案经解放军总医院实验动物伦理委员会批准(批准号:201511007)。

结果与结论:①术后4周末,双侧植骨区可见少量骨赘附着于椎板、模突及关节突关节,实验组人工骨结构形态清晰可见,仅在人工骨周围形成少量新生骨;术后8周末,双侧植骨区已形成大量骨赘,融合块成为贯通整个运动节段的整体,实验组新生骨已对植骨材料形成包绕;术后12周末,双侧植骨区所形成的融合块明显增粗增大,较8周末时强壮许多,融合块外形已呈柱状,上、下关节突关节已融入融合块,实验组可见大量新骨包绕人工植骨材料,人工骨支架的结构已见崩解,实验组所形成的融合块明显要比自体骨侧大;②随着时间的延长,实验组的骨矿物质含量、组织矿物质含量及骨体积分数均逐渐减少;③结果表明,在兔胸椎多节段后外侧植骨融合模型中,人工骨能够获得稳定融合,人工骨材料在植入体内后逐渐降解,降解速度与新骨长入速度匹配。

关键词: β-磷酸三钙, α-半水硫酸钙, 自体骨, 植骨材料, 复合人工骨, 复合材料, 脊柱融合, 多节段, 兔, 胸椎, Micro-CT

Abstract:

BACKGROUND: Because of the limitation of physico-chemical properties, one kind of graft material alone in spinal arthrodesis cannot match the clinical demands, therefor combined bone grafts consisted of more than two kinds of materials are the issue of concern.
OBJECTIVE: To evaluate the new bone formation and the graft materials resorption of β-tricalcium phosphate/α-calcium sulphate hemihydrate combined bone grafts in rabbit model of multi-segments posterolateral arthrodesis of thoracic vertebrae by micro-CT.
METHODS: Thirty-six rabbits (provide by Experimental Animal Center of General Hospital of PLA) were selected, and their superior/inferior articular processes, bilateral vertebral plate and transverse processes of T4-8 were removed. β-Tricalcium phosphate/α-calcium sulphate hemihydrate combined bone grafts were transplanted into the lateral posterior part of left vertebral plate of T4-8 (control group), and autologous bone was transplanted into the another side (control group). The thoracic vertebrae were removed at postoperative 4, 8 and 12 weeks for micro-CT scanning. The morphologic changes of fusion masses were observed. The total bone mineral content, material mineral content, and material volume fraction in the experimental group were analyzed. The experimental protocol was approved by the Animal Ethics Committee of General Hospital of PLA, approval number: 201511007.
RESULTS and CONCLUSION: (1) At the end of 4th week postoperatively, there were a few osteophytes attached to the laminae, transverse processes and zygapophysial joints at both sides of graft areas. In the experimental group, the morphology of bone graft was clear, and there were few newly born bones surrounding the graft. At the end of 8th week postoperatively, there were large amount of osteophytes in the graft areas, fusion masses had involved in the complete motion segments, and the newly born bones being surrounded the graft in the experimental group. At the end of 12th week postoperatively, the fusion masses were enlarged, appeared to be columnar, and the fusion masses were fused into the zygapophysial joints. There were abundant newly born bones surrounding the graft materials in the experimental group, and the scaffold degraded. The fusion mass in the experimental group was obviously larger than that in the control group. (2) The bone mineral content, material mineral content, and material volume fraction in the experimental group were decreased with time. (3) In summary, stable fusion effect of combined bone grafts can be achieved in rabbit models of multi-segments posterolateral thoracic arthrodesis, the combined bone grafts degrade with time, and the degrade speed matches with new bone formation.   

Key words: β-tricalcium phosphate, α-calcium sulphate hemihydrate, autologous bone, graft materials, combined bone grafts, combined materials, spinal arthrodesis, multi-segments, rabbit, thoracic vertebrae, micro-CT

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