中国组织工程研究 ›› 2013, Vol. 17 ›› Issue (41): 7278-7283.doi: 10.3969/j.issn.2095-4344.2013.41.014

• 组织构建实验造模 experimental modeling in tissue construction • 上一篇    下一篇

坐骨神经牵拉伤模型MR扩散张量成像与病理的对照

陈镜聪1, 2,李新春1,万  齐1,孙翀鹏1,何建勋1,蒙秋华1,洪国斌3   

  1. 1广州医学院第一附属医院,广东省广州市  510120;2惠州中心人民医院,广东省惠州市  516001;3中山大学第五附属医院,广东省珠海市  519000
  • 收稿日期:2013-04-17 修回日期:2013-08-05 出版日期:2013-10-08 发布日期:2013-11-01
  • 通讯作者: 李新春,博士,教授,广州医学院第一附属医院,广东省广州市 510120 xinchunli@163.com 并列通讯作者:洪国斌,博士,教授,中山大学第五附属医院,广东省珠海市 519000 13702338598@163.com
  • 作者简介:陈镜聪★,男,1984年生,广东省梅州市人,汉族,2012年广州医学院(现改名为广州医科大学)毕业,硕士,医师,主要从事磁共振成像研究。 chenjimson@163.com
  • 基金资助:

    国家自然科学基金项目(81171800)*;广东省自然科学基金(0630112)*

Magnetic resonance diffusion tensor imaging of a sciatic nerve traction injury model and its pathologic correlation

Chen Jing-cong1, 2, Li Xin-chun1, Wan Qi1, Sun Chong-peng1, He Jian-xun1, Meng Qiu-hua1, Hong Guo-bin3   

  1. 1The First Affiliated Hospital of Guangzhou Medical University, Guangzhou  510120, Guangdong Province, China; 2Huizhou Municipal Central Hospital, Huizhou  516001, Guangdong Province, China; 3The Fifth Affiliated Hospital, Sun Yat-sen University, Zhuhai  519000, Guangdong Province, China
  • Received:2013-04-17 Revised:2013-08-05 Online:2013-10-08 Published:2013-11-01
  • Contact: Li Xin-chun, M.D., Professor, the First Affiliated Hospital of Guangzhou Medical University, Guangzhou 510120, Guangdong Province, China xinchunli@163.com Corresponding author: Hong Guo-bin, M.D., Professor, the Fifth Affiliated Hospital, Sun Yat-sen University, Zhuhai 519000, Guangdong Province, China 13702338598@163.com
  • About author:Chen Jing-cong★, Master, Physician, the First Affiliated Hospital of Guangzhou Medical University, Guangzhou 510120, Guangdong Province, China; Huizhou Municipal Central Hospital, Huizhou 516001, Guangdong Province, China chenjimson@163.com
  • Supported by:

     National Natural Science Foundation of China, No. 81171800*; Natural Science Foundation of Guangdong Province, No. 0630112*

摘要:

背景:磁共振弥散张量成像可以显示周围神经损伤的弥散变化并进行定量研究,因而在显示神经损伤及再生方面具有良好的应用前景。
目的:探讨兔坐骨神经急性牵拉伤弥散张量成像的可靠性,明确弥散张量参数在神经损伤诊断中的价值及病理学基础。
方法:选取32只新西兰白兔建立右后肢坐骨神经退变与修复模型,左后肢为假手术侧。采用 1.5 T MRI 机于术后1 d,3 d,1周,2周,3周,4周,6周,8周行双侧坐骨神经弥散张量成像,进行DTT重建,测量各向异性分数、表观扩散系数;然后进行病理检查。
结果与结论:牵拉伤后1 d弥散张量成像仅显示神经近段,损伤段及远段中断;牵拉伤后1周远段出现细、短纤维束;牵拉伤后2-6周远段纤维束增多、增粗;牵拉伤8周神经纤维大部分恢复正常。1 d-8周牵拉段、牵拉远段各向异性分数值与假手术侧差异有显著性意义(P < 0.05);1 d-1周牵拉近段各向异性分数值与假手术侧差异有显著性意义(P < 0.05)。1-8周不同牵拉段表观扩散系数值与假手术侧差异均无显著性意义。神经牵拉伤早期各向异性分数值下降的病理改变是髓鞘板层疏松,崩解,轴索崩解;各向异性分数值升高的病理基础是髓鞘、轴索再生。结果可见DTT纤维示踪成像可清晰、直观、早期显示兔坐骨神经牵拉伤的异常改变,各向异性分数值测量可作为监测坐骨神经牵拉伤后退变及再生的敏感方法。

关键词: 组织构建, 组织构建实验造模, 坐骨神经, 牵拉伤, 弥散张量, 磁共振成像, 病理, 兔, 国家自然科学基金

Abstract:

BACKGROUND: Magnetic resonance diffusion tensor imaging can display the dispersion changes of peripheral nerve injury and be used to conduct quantitative research, so it has good application prospects in displaying the nerve injury and regeneration.
OBJECTIVE: To investigate the possibility of magnetic resonance diffusion tensor imaging of rabbit acute sciatic nerve traction injury, and to figure out the value of diffusion tensor parameters in the diagnosis of peripheral nerve injuries and to reveal the pathologic basis. 
METHODS: The right hind limb sciatic nerves of 32 New Zealand white rabbits were selected to make the regeneration and repair models, the left hind limb nerves as the sham-operation side. Diffusion tensor imaging examination of sciatic nerves were performed at 1 and 3 days, 1, 2, 3, 4, 6 and 8 weeks after operation with 1.5 T MRI. Fractional anisotropy and apparent diffusion coefficient were measured through diffusion tensor tracing reconstruction, and then the pathological examination was performed.
RESULTS AND CONCLUSION: Diffusion tensor imaging revealed only the proximal nerve, injured nerve as well as the middle of the distal nerve at 1 day after traction injury. At 1 week, the nerve of distal portion appeared thinner and shorter fiber bundle. At 2-6 weeks after operation, the fiber bundle was increased and thickened. At 8 weeks after operation, the distal nerve fibers had nearly restored to the level before injury. There was significant difference in the fractional anisotropy value of traction portion and distal portions between traction injury and sham-operation group at 1 day-8 weeks after operation (P < 0.05). While there was significant difference in the fractional anisotropy value of proximal traction portion between traction injury and sham-operation group 1 day-   1 week after operation (P < 0.05). There were no significant differences in the apparent diffusion coefficient values between traction injury and sham-operation group at 1 day-8 weeks after operation. Fall of fractional anisotropy value in the early stage of nerve traction injury was the result of myelin sheath broke down and axonal disintegrated; recovery of fractional anisotropy value resulted from myelin sheath proliferated and myelin sheath grew slowly to mature. Diffusion tensor tracing can show the abnormal change of the sciatic nerve with traction injury in rabbit clearly and early, and the measurement of fractional anisotropy value can be used as the sensitive method to monitor the degeneration and regeneration after nerve traction injury.

Key words: sciatic nerve, diffusion, magnetic resonance imaging, pathology, rabbits

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