失重性骨质疏松腰椎力学性能研究

航天员在长期失重环境影响下,会容易造成椎体失重性骨质疏松。为了探究骨质流失对腰椎承载能力的影响,设计了不同骨密度的腰椎力学仿真,通过图像处理建立了腰椎三维模型,利用有限元算法得到腰椎应力分布,对比了不同材料属性腰椎模型应力结果。结果表明:骨质疏松腰椎的应力值较正常腰椎变小,而形变量却明显增大。可以看出,骨质流失时,会导致腰椎骨骼材料性能发生变化,使腰椎形变量增大,并且使腰椎结构承载能力降低。

Mechanical Properties of Weightless Osteoporosis Lumbar Vertebrae

Under the condition of long-term weightlessness,astronauts suffer from weightlessness osteoporosis.In order to explore the effect of bone loss on the lumbar bearing capacity,the lumbar spine mechanics experiment with different bone densities was designed.The three-dimensional model of lumbar vertebrae was established by image processing,and the lumbar vertebrae stress was obtained by finite element algorithm(FEA).By comparing the stress results of lumbar models with different material properties,the results showed that the stress value of lumbar spine in osteoporosis was smaller than that of normal lumbar vertebrae,but the deformation was significantly increased. It can be seen that bone loss will lead to changes in the performance of lumbar bones, increasedlumbar deformation,and decreasedlumbar structural load capacity.