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[目的]探讨磷酸钙骨水泥复合rhBMP-2/明胶微球复合材料在治疗骨缺损时的降解、成骨性能.[方法]制备携载rhBMP-2的明胶微球(GMs),与磷酸钙骨水泥(CPC)复合,制备出rhBMP-2/GMs/CPC复合人工骨.取30只新西兰大白兔,在前臂桡骨中段制造人工骨缺损,随机分成3组,分别植入rhBMP-2/GMs/CPC/复合物(A组)、GMs/CPC(B组)、rhBMP-2/CPC(C组),术后6、12周分别进行X线检测、骨密度测定,术后12周处死动物,分别行生物力学测定,脱钙切片、HE染色.不脱钙切片进行荧光显微镜下观察双标间距,计算平均矿化率.[结果]与GMs/CPC、rhBMP-2/CPC组比较,复合材料植入后不同时间点的材料降解及成骨均高于对照组.12周A组标本生物力学实验测定结果表明指标接近正常,与B、C组比较有统计学差异.骨密度12周、新骨矿化率提示有统计学差异.[结论]rhBMP-2/GMs/CPC微球系统复合材料在体内易降解,具有良好成骨活性,是良好的骨修复材料.“,”[Objective]To analyze the biodegradation properties and active osteogenesis features of implanted composites of gelatin mierospheres(GMs)impregnated with calcium phosphate cement(CPC)and recombinant human bone morphogenetic protein-2(rhBMP-2)in bone defect.[Method]rhBMP-2 loaded gelatin microspheres was incorporated in rhBMP-2/CPC during setting.Thirty rabbits were divided into groups A,B and C(10 each).The rhBMP-2/GMs/CPC,GMs/cpc and rhBMP-2/cpc wag implanted into the rabbits of group A,B and C,respectively.The biodegradation properties and active osteogenesis fea-tures of implanted composites bone substitute was evaluated by radiography,histology,bone mineral density(BMD)after the com-posites were implanted into the bone defects at rabbit radius for 6,12 weeks respectively.[Result]Significant implant resorption and bone ingrowth were observed in all rhBMP-2/GM/CPC treated defects while the defects treated with rhBMP-2/CPC im-plants showed slight resorption of CPC and the defects treated with GM/CPC implants showed slisht formation of new bone.[Con-clusion]The result of this study suggested that the rhBMP-2/GMs/CPC composite could be used as material for bone graft sub-stitute.