摘要
背景:有多种钢板治疗跟骨骨折,但究竟哪种效果更好,目前尚无定论。目的:在跟骨骨折三维有限元模型上模拟加载3种类型的钢板,观察比较应力、应变及移位等生物力学性能。方法:在踝关节中立位和背伸20°位建立跟骨骨折三维有限元模型,分别模拟使用跟骨Ⅰ型、Ⅱ型、Ⅲ型3种形状钢板对骨折进行固定,加载后计算内固定物自身的应力分布、骨骼的应力分布及骨折块间的移位程度。结果与结论:①两种体位骨折模型3种固定方式下的钢板应力分布都不均匀,钢板前部应力水平均高于后部,Ⅰ型钢板的应力分布相对比较均匀。②两种体位骨折模型3种固定方式下跟骨的应力最大值均在跟骨前部,而正常跟骨最大应力值在跟结节处,Ⅰ型钢板固定跟骨骨折后骨骼的最大应力值均小于Ⅱ型、Ⅲ型钢板。③两种体位骨折模型3种固定方式下均发生了骨折块间的位移,其位移趋势是一致的。结果显示,与Ⅱ型、Ⅲ型钢板固定相比较,跟骨Ⅰ型钢板固定后所承受应力更小,且应力分布更均匀,较符合生物力学原理。
BACKGROUND：There are many types of plate can be used for the treatment of calcaneus fracture, but it is not clear which type has the best effect. OBJECTIVE：To observe and compare the biomechanical properties, such as stress, strain and displacement of three types of plate through loading them on the three-dimensional finite element model of calcaneus fracture. METHODS：The three-dimensional finite element model of calcaneus fracture was established when the ankle joint was in neutral position and back stretches 20° position, then the type Ⅰ, type Ⅱ and type Ⅲ plates were used to fix the fracture model. Through loading force on the model, the stress distribution of plates and calcaneus, and displacement between fracture gaps were calculated. RESULTS AND CONCLUSION：In the position of the neutral and back stretches 20°, the stress distribution of type Ⅰ, type Ⅱ and type Ⅲ plates was not uniform, and the stress at the front was higher than that at back. Comparatively, the stress distribution of type Ⅰ plate was more uniform than type Ⅱ plate and type Ⅲ plate. And the stress distribution of calcaneus at the front was higher than that at back, while the largest stress of the normal calcaneus was distributed on the tubercle. The maximum stress of calcaneus after fixed with type Ⅰplate was lower than that fixed with type Ⅱ and type Ⅲ plates. Displacement among fracture gaps occurred after fixed with three types of plates in two positions, and the displacement tendency was uniform. The results show that when compared with type Ⅱ and type Ⅲ plates, the stress of calcaneus after fixed with type Ⅰplate is smal er and more uniform which corresponds with the biomechanics principle.
出处
《中国组织工程研究》
CAS
CSCD
2013年第17期3094-3100,共7页
Chinese Journal of Tissue Engineering Research
基金
福建省泉州市科技局资助项目(2007z52)~~
关键词
骨关节植入物
数字化骨科
骨科三维有限元
跟骨骨折
钢板内固定
三维有限元
生物力学
其他基金
bone and joint implants digital orthopedics orthopedic three-dimensional finite element calcaneus fracture plate internal fixation three-dimensional finite element biomechanics other grants-supported paper
