仿生双相陶瓷生物活性骨应用于节段性骨缺损修复

Bionic biphasic ceramic bioactive bone for segmental bone defects

背景:生物陶瓷具有理想的孔径及高的孔隙率、通孔率,能为骨修复细胞提供了理想的生理活动空间,可明显提高骨传导性。目的:探索仿生双相陶瓷生物活性骨在阶段性骨缺损修复中的骨传导性和骨诱导性。方法:将20只新西兰白兔随机等分为生物活性玻璃组和仿生双相陶瓷生物活性骨组,均构建动物桡骨损伤模型后,分别予以生物活性玻璃修复和仿生双相陶瓷生物活性骨修复。结果与结论:造模后4周仿生双相陶瓷生物活性骨组经扫描电镜观察已经形成较为致密的骨膜样组织;造模后8周,形成密集结合部,经观察基本不存在明显的裂隙;造模后12周,完全成骨分界已经模糊不清,呈现出自然的过渡情况,且结合部十分密集,存在数量较多的新生骨组织,骨小梁呈规则状态,且连接成片,且骨材料大部分已经降解,骨组缺损得到完全修复,密度与正常骨十分接近。造模后8周生物活性玻璃组经观察,结合部位存在明显裂隙;造模后12周观察,裂隙已出现连接,但较之仿生双相陶瓷生物活性骨组结合不够紧密,骨缺损得到初步修复,可见数量较少的新生骨组织,形成骨小梁,但无法连接或者贯通,未出现明显骨髓腔再通,可见少量连续性骨痂通过断端。表明仿生双相陶瓷生物活性骨修复节段性骨缺损具有良好的骨传导性、骨诱导性及生物相容性。

BACKGROUND： The bioceramics has the ideal pore size, high porosity and the through-hole rate, can provide the ideal physiological activity space for the bone cell repair, and can obviously improve bone conduction. OBJECTIVE： To explore the bone conduction and bone induction in the repair of bone defects in the stage of bone defect of bionic biphasic ceramic bioactive bone. METHODS： A total of 20 New Zealand white rabbits were randomly divided into bioactive glass and biomimetic biphasic ceramic bioactive bone groups, and were used to construct the animal bone damage model. They were given the repair with bioactive glass and biomimetic biphasic ceramic bioactive bone. RESULTS AND CONCLUSION： At 4 weeks after model establishment, scanning electron microscopy demonstrated that dense periosteal tissue was observed in the biomimetic biphasic ceramic bioactive bone group. At 8 weeks, dense combination was found, and no obvious fissure existed. At 12 weeks, complete bone demarcation blurred, showing a natural transition. Moreover, the binding site was very dense. There were a large number of new bone tissues, bone trabecula was regular and connected to a piece. The bone material has been largely degraded. Bone defects were repaired completely. The bone density was close to normal bone. At 8 weeks, in the bioactive glass group, the binding site presented obvious fissure. At 12 weeks, the fissure had been connected, but the binding was not tight as compared with the bionic biphasic ceramic biologic active bone group. The bone defect got preliminary repair. A small number of new bone formed trabecular bone, but could not connect or traverse. There was no recanalization of the marrow cavity. A few continuous bone callus traversed the broken end. These data demonstrate that bionic biphasic ceramic bioactive bone has good bone conduction,bone induction and biocompatibility in the repair of segmental bone defects.