重组人工骨修复实验性骨缺损影像学评价

目的]探讨重组人胰岛素样生长因子-1（recombinant human insulinlike growth factor-1，rhIGF-1）／珊瑚羟基磷灰石（coralline hydroxyapatite，CHA）／自体红骨髓（autogeneous red bone marrow，ARBM）复合修复骨缺损的能力。方法]成年中国家兔54只，随机分为3组，制成双侧桡骨中段11mm骨-骨膜全层缺损模型，每组18只，每组动物左右两侧缺损分别随机植入2种不同材料：1组两侧分别植入材料A（CHA／ARBM／rhlGF．1）和B（CHA／ARBM）；2组植入C（CHA／rhIGF-1）和D（CHA）；3组植入E（自体皮质骨）和F（缺损旷置）。术后行大体、X线（2、4、8、12周）和^99mTc—MDP骨扫描（12周）观察。结果]A组X线片显示桥接骨痂生长良好，12周时缺损修复。12周^99mTc—MDP骨显像示A和E组修复区高度核浓聚。结论]CHA／ARBM／rhIGF-1重组人工骨移植可协同实现骨传导、骨诱导和骨再生作用，促进骨缺损重建。

Imaginological study on resombinant artificial bone substitute for experimental bone defects

Objective]To investigate the ability of repairing bone defect with the combination of recombinant human insulin-like growth factor-1(rhIGF-1),coralline hydrolyapatite(CHA) and autogeneous red bone marrow(ARBM) by way of imaginology.Method]Bilateral middle radius periosteum-bone defects (11mm in length) were created in 54 Chinese rabbits,and were ramdonly devided into 6 groups(each group containning 18 radial defects of one forearm): group A, defects transplanted with rhIGF-1/CHA/ARBM,group B,with CHA/ARBM,group C,with rhIGF-1/CHA,group D,with CHA,group E,with autograft,group F,no implant.At 2,4,8,and 12 weeks postoperation,the repair effects of defects were evaluated by observation of gross appearance,roengenodiagnosis and radionuclide bone image assay.Result]In group A,radiological and bone density image analysis showed that the defects were bridged well at 12 weeks postoperatively and was significantly superior to those of any other groups(P<0.01) at each observing time points.The results showed by single photon emission computerized tomography revealed that the radioactivity of group A rhIGF-1/CHA/ARBM and group E autograft were mark increased than those of any other groups(P<0.01),but no significant defference between group A and group E(P>0.05).Conclusion]The recombinant compound rhIGF-1/CHA/ARBM,which possesses the potential ability of osteogenesis,osteocondution and osteoinduction for bone defect repairing,can enhance bone healing and serve as a new type of bone substitute.