可调式跟骨外固定器生物力学研究

BIOMECHANICS EXPERIMENT STUDIES ON ADJUSTABLE EXTERNAL FIXATION DEVICE OF CALCANEAL FRACTURE (CFEFD)

目的 探讨跟骨骨折采用可调式跟骨外固定器 (CFEFD)治疗时的生物力学功能的有效性 ,为临床手术提供可靠的科学依据。方法 采用 7具新鲜的成人下肢足部标本进行实验应力分析 ,建立实验力学模型 ,测量正常人足跟骨和跟骨骨折外固定后的生物力学特性 ,进行对照比较。结果 跟骨骨折采用CFEFD固定后跟骨的生物力学特性、承载能力、跟骨的应力、足弓的位移等与正常足无显著差异 (P >0 .0 5 ) ,该器械的强刚度等达到了设计要求。结论 可调式跟骨骨折外固定器在治疗跟骨骨折上能满足足部生物力学要求 ,不但强度大、承载能力高、稳定性好 ,而且安全可靠、操作简便 。

Objective To study the effectiveness of CFEFD, on the treatment of calcaneal fracture to provide the reliable theoretical basis for clinical operations. Methods Seven fresh specimens of adult lower limb heels were collected for experimental stress analysis to establish experimental mechanics modeling. To compare the biomechanical properties between the normal human calcaneus heel bones and those of calcaneal fracture, by using CFEFD. Results The experimental results show that there is no significant difference (P>0.05) in biomechanical properties, bearing capacity, stress of calcaneus heel bones, displacement of instep, and other aspects for posterior bones between the calcaneal fracture with the adjustable external fixation device and the normal human calcaneus heel bones. The rigidity of this device is found to satisfy the design requirements. Conclusion This device is not only able to satisfy the biomechanical requirements for calcaneus heel bones with its endurable strength, strong bearing capacity and favorable reliability in the treatment of calcaneal fracture, but also safe and easy to use, and proves to be one of the best medical apparatuses deserving the popularization in the medical applications.