冻干同种异体髂骨作为支架材料的性能研究

目的 研究冻干同种异体髂骨块支架材料的微观结构及生物力学特点.方法 参考美国组织库协会标准,进行髂骨块采取、脱细胞、脱脂、脱蛋白、消毒、保存.分别将纤维蛋白胶、利福平负压灌注入骨块孔隙内;大体观察冻干同种异体髂骨块、载利福平髂骨块的结构特征,扫描电镜观察孔径、孔隙连通、利福平晶体分布情况,液体置换法测定孔隙率和密度,弯曲试验、扭转试验、压缩试验评价其力学性能.结果 冻干同种异体髂骨支架材料呈乳白色,为三面薄层皮质骨及中间松质骨组成的"夹心饼结构",具有骨组织天然三维网状孔隙,孔隙内洁净,相互连通,利福平晶体被纤维蛋白胶均匀地固定于骨块表面和内部;冻干同种异体髂骨块密度(0.35±0.03)g/ml,孔隙率(67.23±9.12)%,孔径(395.36±37.02)μm,抗扭强度(5.96±1.53)MPa,抗压强度(9.94±0.73)MPa,弹性模量(376.14±27.32)MPa,抗弯强度(15.70±2.35)MPa.结论 冻干髂骨块具有天然生理性孔隙,生物力学性能良好,具有广阔的开发前景.

Study on properties of freeze-dried iliac crest bone allograft as scaffold material

Objective To study the microstructure and biomechanical properties of freeze-dried iliac crest bone allograft with regard to its potential applications as bone substitute,scaffold for bone tissue engineering and in drug delivery system.Methods Procurement,processing,sterilization and conservation of the iliac crest allograft scaffold were all performed according to the guidelines of the American Association of Tissue Banks.The graft segments were impregnated with Fibrin glue and rifampicin using negative pr...