正常国人跖骨应力骨折的实验研究

THE EXPERIMENTAL STUDY OF STRESS FRACTURE OF THE METATARSAL BONES IN NORMAL CHINESE ADULTS

本文将人体双足简化为一承受体重的悬臂梁结构,将跖骨简化为受悬臂弯曲的杆件;取正常国人新鲜尸体跖骨16个,在2H型悬臂疲劳试验机上进行实验。实验确定了跖骨发生应力骨折的极限范围,即在0.906kg/mm^2应力作用下,循环次数为5.6×10~5次。文章还对疲劳断口进行了生物力学分析。

The stress fracture is often resulted from forced march, heel-and-toe walking race, trudge over a longdistance etc. The stress fracture in metatarsal bone is very common. After analysis of bearing-force onmetatarsal bone, the feet are simplified as weight-bearing-cantilever beam structure, while the metatarsalbone as lever units which support the bending cantilever. 16 metatarsal bones were taken from freshcadavers of normal Chinese adults. TYPE 2H cantilever stress teeting machine was used for the experiment.This study analyzes the injury mechanism of stress fracture theoretically, the defines limit of stress fractureof the metatarsal bone, and makes biomechanical analysis for the fracture types. This experiment providesthe data and materials for prevention and diagnosis of stress fracture and the possibility of methods andpaths for stress fracture experiment of the biomaterials.