游离骨膜与复合rhBMP2的异种骨联合移植修复骨缺损的实验研究

目的 探讨复合基因重组人ＢＭＰ２（ｒｈＢＭＰ２）的异种骨与游离骨膜（ＦＰ）联合移植修复节段性骨缺损的效果。方法 将ｒｈＢＭＰ２与去抗原牛松质骨载体（ＢＣＢ）复合,制成ｒｈＢＭＰ２／ＢＣＢ;选用新西兰大耳白兔２８只,制成烧骨干１５ｍｍ缺损动物模型,分别行ＦＰ和ｒｈＢＭＰ２／ＢＣＢ复合移植（ｎ＝６）、ｒｈＢＭ２／ＢＣＢ移植（ｎ＝６）和单纯ＢＣＢ移植（ｎ＝２）;术后４、８、１２、１６周取材,通过Ｘ线、生

Combined use of rhBMP2/BCB and free periosteum in repairing segmental defects in radii of rabbits

Objective To study the efficacy of combined use of rhBMP2/BCBand free periosteal graft in repairing segmental bony defects. Methods A new grafting material (rhBMP2/BCB)was made by combining recombinant human BMP2(rhBMP2) and an antigen free bovine cancellous bone (BCB) as a carrier. rhBMP2/BCB was used alone in conjunction with free periosteal graft to repair a 1.5cm defect in the radius of the rabbit. The defect repairing capability for each of the treatment modalities was assessed radiographically, biomechanically, and by densitometry and histological studies. Results rhBMP2/BCB used alone was capable of healing the defect in large by 16 weeks, with a similar repair process and mechanism seen with RBX. Combined use of rhBMP2/BCB and free periosteal graft was superior in terms of increased amount and quality of the new bone formed at the early stage of the repair process (within 12 weeks) to rhBMP2/BCB used in isolation, with the defect basically healed by 12 weeks. Conclusions Both methods are effective in repairing segmental bony defects, with rhBMP2/BCB used in conjunction with free periosteal graft being most preferred, considering the satisfactory osteogenesis, osteoconduction and osteoinduction.