结论：由于固定3层或4层骨皮质无差别，可以由手术医生决定固定骨皮质的数目。
Conclusions: Because no difference was seen between 3 or 4 cortices, it is the surgeon's choice in determining how many cortices of fixation are achieved.
目的研究大段同种异体皮质骨移植过程中哈佛系统的成骨作用，探讨大段同种异体皮质骨愈合活化表面的临床意义。
Objective To study inductive osteogenesis of Haversian system and evaluate the clinical significance of the vitalization surface in the healing process of the massive cortical allografts.
远侧骨皮质较近侧骨皮质更易发生骨折（P<0.05）。
The fracture occurred more frequently on distal cortex than on proximal cortex(P< 0.05).
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