BACKGROUND:Nano-hydroxyapatite/polyamide 66 is a new nanobionic composite material and has good biocompatibility and bone conduction, but after implantation, whether the composite material can bind to vertebral bone interface and whether it is safe in clinical use stil need further studies. OBJECTIVE: To observe the ability of nano-hydroxyapatite/polyamide composite binding to the interface of artificial humeral head. METHODS: The rabbits were randomly divided into two groups: composite group was implanted with nano-hydroxyapatite/polyamide composites; control group implanted with autologous bone. After the replacement, rabbit bone marrow mesenchymal stem cels were subjected to primary culture, and then the cels were co-cultured with the composite material. RESULTS AND CONCLUSION:At 24 hours after culture, bone marrow mesenchymal stem cels grew wel on the composite materials. The cel adhesion rate was significantly higher in the composite group than the control group at 1 and 4 hours after culture (P < 0.05). After co-culture 4.5, 5.5, 6.5 hours, the absorbance value of cels in the composite group was higher than that in the control group (P < 0.05). At 24 weeks after replacement, changing ranges in the proportions of bone tissue and fibrous layers on the implant surface as wel as coverage rate in the composite group were the highest (P < 0.05). These findings indicate that the nano-hydroxyapatite/ polyamide composite implant has a certain binding capacity, which can make a good interface osseointegration.%背景:纳米羟基磷灰石/聚酰胺 66 是一种新型的纳米仿生复合材料,具有良好的组织相容性以及骨传导性,但其植入体内后和骨界面的接合生长如何、临床应用是否安全等尚需要进一步研究.目的:观察纳米羟基磷灰石/聚酰胺复合材料在人工肱骨头柄界面的结合能力.方法:将兔随机分为2组,均进行肩关节肱骨头转换,复合材料组植入纳米羟基磷灰石/聚酰胺人工肱骨头;对照组植入自体髂骨.置换后对兔进行骨髓间充质干细胞原代培养,再将骨髓间充质干细胞与纳米羟基磷灰石/聚酰胺复合材料共培养进行观察.结果与结论:细胞培养24 h后,骨髓间充质干细胞在复合材料局部生长情况较好.复合材料组培养1,4 h的细胞黏附率显著高于对照组(P < 0.05).复合材料组共培养4.5,5.5,6.5 h细胞吸光度值百分率值显著高于对照组(P < 0.05);置换24周后复合材料组表面骨组织、纤维层的比例变化幅度及覆盖率最高(P < 0.05).结果证实,纳米羟基磷灰石/聚酰胺复合材料植入体柄具有一定的界面骨结合能力,可使界面骨整合良好.
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