模拟人后路髓核摘除构建椎间盘退行性变动物模型

Constructing a rabbit model of intervertebral disc degeneration by simulating the removal of human nucleus pulposus through a posterior approach

背景:髓核摘除术是治疗椎间盘突出的经典方法,但存在较高的复发率。目的:验证模拟人后路髓核摘除进行后外侧穿刺抽吸髓核,建立椎间盘退行性变动物模型的可行性。设计、时间及地点:观察对照实验,于2006-10/2007-02在解放军南京军区福州总医院动物实验室完成。材料:选用日本大耳白兔20只,行椎间盘退行性变动物模型制备。方法:用持针器夹持21G穿刺针,行L1～2及L3～4椎间盘右后外侧穿刺髓核抽吸法摘除部分髓核组织,术后2,4,8,12周分别对造模后椎间盘行组织学观察,并将L2～3椎间盘作为对照。主要观察指标:通过苏木精-伊红染色观察椎间盘组织学结构。结果:苏木精-伊红染色可见对照椎间盘大多髓核完整,髓核与纤维环分界清晰,纤维环结构接近正常,髓核组织中有大量髓核细胞。造模后第4周髓核细胞数量不断减少,第12周时髓核中主要为纤维组织,伴有极少量髓核细胞。结论:模拟人后路髓核摘除术建立后外侧纤维环穿刺髓核抽吸的椎间盘退行性变动物模型成功建立,可为应用组织工程修复重建退行性变椎间盘提供有效的动物模型。

BACKGROUND： Resection of the nucleus pulposus is the classical treatment for intervertebral disc protrusion, except a higher recurrence rate. OBJECTIVE： To verify the feasibility of establishing an animal model of intervertebral disc degeneration by puncture and aspiration via a posterolateral approach to simulate resection of human nucleus pulposus. DESIGN, TIME AND SE＇R＇ING： The experiment was conducted in the animal Experimental Center of Fuzhou General Hospital of Nanjing Military Area Command of Chinese PLA from October 2006 to February 2007. MATERIALS： Twenty Japanese big ear rabbits were selected to establish animal models of intervertebral disc degeneration. METHODS： Some nucleus pulposus tissues were abstracted from the L1-2and L3-4 segment of 20 rabbits by the puncture and aspiration method using a 21-gauge hypodermic needle. Histological analysis was performed at 2, 4, 8, 12 weeks after surgery, and L23 segment was used as control group. MAIN OUTCOME MEASURE： Histological structure of the intervertebral disc was observed by hematoxylin-eosin staining. RESULTS： Hematoxylin-eosin staining revealed a great deal of complete nucleus pulposus tissues, clear boundaries between nucleus pulposus and annulus fibrosus in the control group, and the structure of near normal annulus fibrosus was almost normal, nucleus pulposus tissue had a large number of nucleus pulposus cells. In the experimental group, the nucleus pulposus cell reduced in amount in the fourth week, the nucleus pulposus at the twelfth week were mainly full of fibroblasts, while few nucleus pulposus cells were found. CONCLUSION： It is successful to establishing an animal model of intervertebral disc degeneration by puncture and aspiration via a posterolateral approach based on simulating the resection of human nucleus pulposus. This model is available for repairing intervertebral disc degeneration using tissue engineering techniques.