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目的探讨股骨头缺血性坏死囊变对骨密度分布的影响。方法采用Weinans-Huiskes骨重建模型,运用有限元分别计算正常股骨头及囊变股骨头骨密度分布。结果 (1)模拟生成了正常股骨上段内侧压缩小梁束M、横向张力小梁束L、粗隆间的斜向小梁束I和Ward三角。(2)如果发生一个原发囊变,则原发囊变区外下方会出现继发囊变区,且继发囊变区骨的密度将随原发囊变区体积的增大而急剧减小。囊变还将改变股骨的承重桁架系统。结论 (1)Wolff定律与现代拓扑优化理论是吻合的;(2)股骨头缺血坏死出现囊变后,应及时治疗以阻止继发新的囊变和股骨头塌陷的产生。
Objective To investigate the effect of avascular necrosis of the femoral head on the distribution of bone mineral density. Methods Weinans-Huiskes bone reconstruction model was used to calculate the bone mineral density distribution of normal femoral head and femoral head by using finite element method. Results (1) The medial compression trabecular bundle M, the transverse tension trabecular meshwork L, the trochanteric trabecula I and the Ward triangle in the normal femur were simulated. (2) If a primary cystic degeneration occurs, the secondary cystic degeneration will appear below the primary cystic degeneration, and the density of the secondary cystic degeneration will decrease rapidly with the volume of the primary cystic degeneration small. Capsule change will also change the femoral load-bearing truss system. Conclusion (1) Wolff’s law is consistent with modern theory of topological optimization; (2) After cystic degeneration of avascular necrosis of the femoral head, prompt treatment should be taken to prevent secondary cystic change and femoral head collapse.