骨折愈合塑形的力学机理I^＊——骨表面再造理论的应用

深入探讨长骨骨折愈合塑形阶段的力学机理,采用骨表面再造理论与有限元结合的方法。我们选取用应变能密度作为力学激励的骨表面再造理论,有限元分析采用三维的空间模型,利用我们编制的长骨表面再造系统“BRSS97”对长骨骨折愈合塑形阶段的三种类型：外骨痂型、骨内缺损型和骨外缺损型的力学机理进行研究。结果表明：骨痂可以完全吸收,骨缺损可以恢复,三种情况下骨均可以恢复到正常状态。由此说明长骨骨折愈合塑形过程就是骨材料对力学激励的适应过程。

Mechanical mechanism in plastic stage of fracture union--application of bone surface remodeling theory]

In this paper is presented a discussion on the mechanical mechanism in the plastic stage of fracture union. We adopt the bone surface remodeling theory in conjunction with finite element method, choose the strain energy density as mechanical stimulus, work at a three-dimensional finite element model, and then we investigate the mechanical mechanism in the plastic stage of fracture union in three types: exterior osteotylus, interior bony defect and exterior bony defect, using long bone surface remodeling software "BRSS97" we design. The results show that osteotylus can be completely absorbed, and bony defect can recover. For all the three types, the final bone configuration resembles normal state bone configuration. It proves that long bone configuration in the plastic stage of fracture union is the result of the adaptation of bone to loading environment.