海藻酸钙/纳米羟基磷灰石/胶原复合材料修复兔桡骨缺损

Repair of Radius Bone Defect with the Nano-hydroxyapatite/Collagen/Calcium Alginate

目的探讨海藻酸钙/纳米羟基磷灰石/胶原复合材料植入动物体内的成骨能力。方法用18只3月龄健康新西兰大白兔制备兔桡骨中段15mm骨缺损模型。将每只兔子的左右前肢按随机数字表法分为实验组和对照组。在实验组兔桡骨缺损部位植入海藻酸钙/纳米羟基磷灰石/胶原复合材料,对照组为空白对照,骨缺损部位不植入任何材料。分别于术后4、8、12周采用X线和组织学方法检测缺损部位的成骨情况。结果18只模型兔均进入结果分析。X线结果显示,4周时实验组桡骨缺损区可见明显的骨生成影像,呈云雾状分布,随时间的延长骨量增多,至12周时,植入体已与缺损处断端骨性愈合,皮质骨连续性较好。对照组12周时显示骨断端骨质硬化,骨缺损区尚未修复。组织学结果表明,4周时实验材料内部可见骨形成细胞集中,随时间的延长骨量增多,并相互连接成片,到12周时,材料内骨小梁成熟,网孔间新生骨小梁相互连接成板状。结论海藻酸钙/纳米羟基磷灰石/胶原复合材料具有良好的成骨能力。

Objective To explore the osteogenic potential of the nano-hydroxyapatite/collagen/calcium alginate composite implanted in animals. Methods Eighteen 3-month-old New Zealand white rabbits were adopted to prepare 15 mm segmental defect model at the middle part of radius. Rabbit models were randomly divided into experimental group and blank control group. Nano-hydroxyapatite/collagen/calcium alginate was implanted into the defects of experimental group. Four, 8, and 12 weeks after operation, all specimens were examined by X-ray and histological methods. Results All the 18 rabbit models entered the final analysis. X- ray showed that osteotylus was seen in the whole defect area in the experimental group 12 weeks after operation, during which osteogenesis was more obvious than in weeks 4 and 8 and the bridge grafting of defect area was ob- viously visible. In the blank control group, osteotylus was only observed at the two ends of the defects, and no osteogenesis was found in the central part of the defect area. Histological examination showed that new osteoid formation was seen in internal porous zone in the experimental group in weeks 4 and 8 ; in week 12, more woven bone-like tissues were visible and trabecular-like structure was formed. Conclusion The nano-hydroxyapatite/ collagen/calcium alginate has good osteogenic potential.