医用TH胶栓塞建立月骨缺血性坏死兔模型

摘要

BACKGROUND:Kienböck disease lacks of suitable animal models, which are similar to the pathological process of avascular necrosis of human lunate bone. OBJECTIVE:To establish a new animal model of Kienböck disease using medical TH adhesive embolism and to explore the rationality of model establishment. METHODS:A total of 30 healthy adult New Zealand rabbits, male or female, were selected. Using self-control method, the rabbits were randomly assigned to experimental sides and control sides. By dril ing in the center of the lunate bone, 0.2 mL of medical TH glue was injected three times. An equal volume of physiological saline was injected into the center of the lunate bone on the control side. X-ray examination, general observation, Micro-CT measurement of bone, and tissue pathology detection were conducted at 4, 8 and 12 weeks. RESULTS AND CONCLUSION:Gross specimen, X-ray and histological results showed that ischemic necrosis of the lunate bone on the experimental side was visible at 8 weeks after model induction. The ischemic necrosis of the lunate bone became more typical at 12 weeks. Among the Micro-CT microscopic parameters of trabecular bone, trabecular bone density parameters bone volume fraction and the number of trabecular bone were significantly lower on the experimental side than those on the control side (P<0.05). Spatial parameters of trabecular bone significantly increased. Trabecular separation and structure model index on the experimental side were significantly greater than those on the control side. Results suggested that ischemic necrosis of the lunate bone appeared on the experimental side at 8 weeks after injection of medical TH glue. Rabbit models of ischemic necrosis of the lunate bone can be established at 12 weeks. Thus, alterations, which were similar to ischemic necrosis of human lunate bone, appeared, such as blood transportation damage in the lunate bone, trabecular bone fracture, and empty lacuna, when surrounding tissues were not obviously injured.%背景：目前缺乏与人类月骨缺血性坏死病理过程类似的Kienböck病动物模型。　　目的：采用医用TH胶栓塞法建立一种新型月骨缺血坏死兔模型，并探讨造模方法的合理性。　　方法：选择健康成年新西兰兔30只，雌雄不限。采用自身对照方法随机分为实验侧和对照侧，实验侧采用月骨中心钻孔，注射医用TH胶0.2 mL，反复注药3次；对照侧月骨中心钻孔注射同等量的生理盐水。于实验4，8，12周行X射线、大体观察、Micro-CT 骨计量学及组织病理学检测。　　结果与结论：大体标本、X射线及组织学检测结果可见实验侧造模后8周月骨出现缺血坏死表现，12周月骨缺血坏死更为典型。Micro-CT 骨小梁微观参数中，实验侧骨小梁密度参数骨体积分数及骨小梁数量均明显低于对照侧(P<0.05)；骨小梁空间参数明显增高，其中实验侧骨小梁离度及结构模型指数明显高于对照侧。提示注射医用TH胶栓塞后8周实验侧出现月骨缺血坏死表现，注药后12周可建立月骨缺血坏死兔模型，可以实现在周围组织无明显损伤情况下出现月骨内血运受损、骨小梁骨折、空骨陷窝等与人类月骨坏死类似的改变。