中国组织工程研究 ›› 2016, Vol. 20 ›› Issue (34): 5089-5097.doi: 10.3969/j.issn.2095-4344.2016.34.012

• 纳米生物材料 nanobiomaterials • 上一篇    下一篇

纳米羟基磷灰石/涂层双相磷酸钙人工骨移植脊柱后外侧融合:组合磁场的辅助作用

卓祥龙1,吕红斌2,胡建中3,李 兵1,刘 咏4,吴祖同3   

  1. 1柳州市工人医院脊柱外科,广西壮族自治区柳州市 545001;中南大学湘雅医院,2运动医学科,3脊柱外科,湖南省长沙市 410008;4中南大学粉末冶金研究院,湖南省长沙市  410008
  • 收稿日期:2016-06-04 出版日期:2016-08-19 发布日期:2016-08-19
  • 通讯作者: 胡建中,中南大学湘雅医院脊柱外科,湖南省长沙市 410008
  • 作者简介:卓祥龙,1976年生,安徽省灵璧县人,汉族,2011年中南大学湘雅医院毕业,博士,副主任医师,硕士生导师,主要从事脊柱疾病微创治疗及生物材料相关研究。
  • 基金资助:

    国家自然科学基金资助项目(81171699)

Nano-hydroxyapatite coated biphasic calcium phosphate for posterolateral lumbar fusion: combined magnetic field plays an auxiliary role

Zhuo Xiang-long1, Lv Hong-bin2, Hu Jian-zhong3, Li Bing1, Liu Yong4, Wu Zu-tong3   

  1. 1Department of Spine Surgery, Liuzhou Worker’s Hospital, Liuzhou 545001, Guangxi Zhuang Autonomous Region, China; 2Department of Sport Medicine, 3Department of Spine Surgery, Xiangya Hospital of Central South University, Changsha 410008, Hunan Province, China; 4Powder Metallurgy Research Institute, Central South University, Changsha 410008, Hunan Province, China
  • Received:2016-06-04 Online:2016-08-19 Published:2016-08-19
  • Contact: Hu Jian-zhong, Department of Spine Surgery, Xiangya Hospital of Central South University, Changsha 410008, Hunan Province, China
  • About author:Zhuo Xiang-long, M.D., Associate chief physician, Master’s supervisor, Department of Spine Surgery, Liuzhou Worker’s Hospital, Liuzhou 545001, Guangxi Zhuang Autonomous Region, China
  • Supported by:

    the National Natural Science Foundation of China, No. 81171699

摘要:

文章快速阅读:

 

文题释义:
纳米羟基磷灰石涂层双向磷酸钙人工骨
:双相磷酸钙是由不同比例的羟基磷灰石和β-磷酸钙酸钙混合而成,两者均属于磷酸钙陶瓷,与天然骨矿物质充分和结果类似,具有良好的生物活性和生物相容性。天然骨中羟基磷灰石是以纳米形式存在,纳米羟基磷灰石具有更好地生物活性,在双相磷酸钙人工骨表面进行纳米羟基磷灰石涂层能够提高人工骨的活性和生物相容性。
组合磁场:为一种新型的生物物理刺激,其信号是2种波的组合,为动态交替的正弦电磁场并联叠加于静磁场上组成。静磁场强度0.2 Gs,正弦电磁场的磁场强度为0.4 Gs,频率76.6 Hz,正好在0-150 Hz范围内,这个区域的频率对刺激成骨效果最佳。

 

背景:自体骨移植是脊柱融合的主要方法,但其来源有限,而且伴有很多并发症的发生,人工合成材料已成为最有前途的骨移植替代材料。
目的:观察组合磁场和纳米羟基磷灰石涂层对双相磷酸钙人工骨移植兔脊柱后外侧融合的影响。
方法:制作48只兔双侧L5/6横突间融合模型,随机分成6组:G1组为组合磁场+自体髂骨;G2组为组合磁场+纳米羟基磷灰石/双相磷酸钙;G3组为组合磁场+双相磷酸钙;G4组为安慰剂+自体髂骨;G5组为安慰剂+纳米羟基磷灰石/双相磷酸钙;G6组为安慰剂+双相磷酸钙。术后1周开始组合磁场治疗,30 min/d,治疗8周后处死实验动物,分别进行触摸法、X射线、CT、组织学(脱钙和不脱钙骨)和生物力学评估脊柱融合效果。
结果与结论:①触摸法、X射线法和组织学评估G2组脊柱融合率最高,G6组最低,差异有显著性意义(P < 0.05)。G2组新生骨长入比显著高于G3,G5组和G6组(P < 0.05);②X射线片显示融合区校正吸光度指数G2组显著高于其他各组(P < 0.05);③CT和组织学可见新生骨小梁从自体骨长入人工骨孔隙内,与自体骨形成骨性结合;④生物力学结果显示,G2组脊柱弯曲刚度最高,显著高于其他各组(P < 0.05);⑤析因分析结果显示,组合磁场治疗和纳米羟基磷灰石涂层可显著提高脊柱融合率、融合评分、骨长入比、融合区校正吸光度指数及脊柱融合弯曲刚度(P < 0.05);⑥结果提示,组合磁场联合纳米羟基磷灰石/双相磷酸钙生物支架进行兔脊柱后外侧融合能够显著提高融合率,融合效果类似于单纯的自体骨融合,可作为脊柱融合的一种新方式。

ORCID: 0000-0002-3239-0539(卓祥龙)

关键词: 生物材料, 骨生物材料, 纳米羟基磷灰石涂层, 组合磁场, 双相磷酸钙, 腰椎后外侧融合, 国家自然科学基金

Abstract:

BACKGROUND: Autologous bone is considered the main material for spinal fusion, while synthetic materials overcome the shortcomings caused by the autologous bone (complications and limited source) and become the most promising bone graft substitute materials.
OBJECTIVE: To investigate the effects of nano-hydroxyapatite (nano-HA) coating and combined magnetic field (CMF) on the biphasic calcium phosphate (BCP) transplantation for rabbit posterolateral lumbar fusion.
METHODS: Forty-eight rabbits underwent bilateral intertransverse processes fusion at the level of L5-6, and were then randomly divided into six groups: rabbits in group G1 received autologous iliac bone graft and CMF treatment; group G2 was given nano-HA/BCP and CMF treatment; group G3 received BCP and CMF treatment; group G4 received autologous iliac bone graft and placebo; group G5 underwent nano-HA/BCP and placebo; group G6 received BCP and placebo. CMF treatment was performed 30 minutes each day for 8 consecutive weeks beginning at 1 week after surgery. These rabbits were euthanized at 9 weeks after surgery to evaluate spinal fusion effects through palpation, X-ray examination, CT examination, histological analysis (decalcified and undecalcified sections) and biomechanical assessment.
RESULTS AND CONCLUSION: The palpation, X-ray and histological examinations showed that there was significant difference in the fusion rate between groups G2 and G6, the highest in the group G2, and the lowest in the group G6 (P < 0.05). The bone ingrowth rate in the group G2 was significantly higher than those in the groups G3, G4 and G6 (P < 0.05). The normalized optical density index of fusion mass and bending stiffness in the group G2 were significantly higher than those in the other groups (P < 0.05). CT and histological observations found that new bone trabecula grew into the biological scaffold, exhibiting osseointegration. Factorial analysis showed that CMF and nano-HA coating could significantly improve the spinal fusion rate, fusion score, bone ingrowth rate and bending stiffness (P < 0.05). In conclusion, CMF combined with nano-HA/BCP for rabbit posterolateral lumbar fusion can significantly ameliorate the fusion rate, which is analogous to the single autologous bone; therefore, it can be used as a new spinal fusion method.

Key words: Lumbar Vertebrae, Spinal Fusion, Nanocomposites, Hydroxyapatites, Electromagnetic Fields, Tissue Engineering

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