三种固定器械固定胫骨骨折的应力松弛实验

背景：骨力学是生物力学的分支,研究内外固定器固定骨折后的生物力学特性是评价固定效果的重要方法之一。目的：比较3种内外固定器械固定胫骨骨折后骨的应力松弛特性。方法：模拟胫骨骨折分别以髓内钉,钢板,外固定支架进行固定。在电子万能试验机上对3组标本进行轴向压缩应力松弛实验。结果与结论：从各组内、外固定标本轴向压缩应力松弛曲线可以看出,外固定支架组7 200 s应力松弛量大于钢板和髓内钉组,但差异无显著性意义(P > 0.05)。初步表明股骨颈骨折钢板固定、髓内钉固定、外固定支架固定后对骨的应力松弛特性影响基本一致。

Stress relaxation study of tibial fractures treated by three types of fixation devices

BACKGROUND: Bone mechanics is a branch of biomechanics. Biomechanical property research of fractures after internal and external fixation is an important method to estimate the fixed-effects. OBJECTIVE: To compare the stress relaxation properties of tibial fractures fixed by three different internal and external fixation devices. METHODS: The simulated tibial fractures were fixed by the intramedullary nails, plate, and external fixation respectively. Axial compression stress relaxation experiment was performed in the specimens of the three groups using electronic universal testing machine.RESULTS AND CONCLUSION: Axial compression stress relaxation curves of the specimens fixed with internal and external fixation in each group showed that the stress relaxation at 7 200 s in the external fixation group was higher than those of the plate fixation group and the intramedullary nail fixation group, but the differences were not significant (P > 0.05). The results preliminary showed that the effects of plate fixation, intramedullary nail fixation, and external fixation on stress relaxation property of bone in femoral neck fractures were similar.