松质骨骨折愈合中骨小梁修复的扫描电镜观察

A Scanning Electron Microscopic Observation of Trabecular Repair in Fracture Healing of Cancellous Bone

目的：研究兔股骨髁间截骨后松质骨骨折愈合中骨小梁修复方式．方法：采用成年新西兰兔１８只，在兔股骨髁间作完全截骨后，分别采用石膏、皮质骨和松质骨螺钉固定．术后３周和６周取标本在扫描电镜下观察．结果：采用石膏和皮质骨螺钉固定时，其愈合方式主要通过编织骨修复骨小梁．采用松质骨螺钉固定，其愈合方式主要通过板层骨重建骨小梁．结论：兔股骨髁间截骨后，松质骨骨折愈合存在着直接骨形成和间接骨形成两种愈合方式．

Aim: To study trabecular repair patterns in fracture healing of cancellous bone after osteotomy was made between the medial and lateral femoral condyle of rabbits. Methods: Eighteen adult New Zealand rabbits were used in this experiment. A complete osteotomy between the medial and lateral femoral condyle was performed, and then the bone was fixed with plaster, cortical and cancellous screws, respectively. The distal femoral condyle was observed by scanning electron microscope at 3 and 6 weeks. Results: The trabecular repair pattern of cancellous bone with plaster and cortical screw was accomplished with woven bone. Trabecular repair pattern of cancellous bone with cancellous screw was completed by lamella bone. Conclusion: There are two patterns of direct and indirect bone formation during cancellous bone healing of femoral condyle of rabbit.