摘要
应力骨折是士兵、运动员中很常见的骨损伤，被认为是疲劳骨折。首先测量了士兵在齐步、正步、跑步三种步态下承受的地面载荷，然后用有限元方法分析了在这几种步态下胫骨中的应力分布。结果表明：士兵三种步态下脚底的作用力从小到大依次为齐步，正步和跑步（例如，垂直作用力最大幅值分别为７６ｋｇ，１１８ｋｇ和１４２ｋｇ）。在地面载荷作用下，胫骨中的应力分布是不均匀的，其最大值发生在膝下１／３处，正步和跑步时该处的应力水平分别为１１０ＭＰａ和１１５ＭＰａ。该处正是胫骨骨折临床最常见部位。这些结果给出了胫骨中的应力分布，证明了士兵胫骨应力骨折确是与其中应力水平密切相关的，载荷应力大者正是应力骨折发病率高者。
This investigation was aimed at the fatigue fracture of tibia that often occurs in soldiers,as well as in dancers and athletes.The data of ground reaction force(GRF) of soldiers were measured using a force platform in three common gaits: marching, parading and running. The stress distribution in tibia under these GRFs were analyzed with a FE model. The results showed that the smallest GRF(744.8N) is in quick marching, the next (1156.4N) in parading and the largest (1391.6N) in running. The stress distribution under GRF was mot uniform in the tibia.The maximum stresses occurred at a site 1/3 tibia length below the knee where tibia fracture is often seen clinically. The maximum stresses were 110 MPa and 115 MPa in parading and running respectively. This means that the tibial tractures in soldiers are mostly associated with stress, i.e. the greater the stress is, the higher the incidence of stress fracture comes about.
出处
《生物医学工程学杂志》
EI
CAS
CSCD
北大核心
1998年第1期53-57,共5页
Journal of Biomedical Engineering
关键词
离体胫骨
胫骨骨折
有限元分析
应力分布
步态
Fatigue fracture Gait analysis Finite element method Stress analysis Tibia
