Hansson S, Werke M
Department of Research & Development, Astra Tech AB, S-431 21, Mölndal, Sweden.
J Biomech. 2003 Sep;36(9):1247-58. doi: 10.1016/s0021-9290(03)00164-7.
Assuming that high stress peaks in the bone can trigger bone resorption a screw-shaped bone implant should be given such a design that the peak stresses arising in the bone, as a result of a certain load, are minimized. Using idealized assumptions the aim of the study was to analyse the effect of variations of the size and the profile of the thread of an axially loaded, screw-shaped, bone implant upon the magnitude of the stress peaks in cortical bone. The investigation was performed by means of axisymmetric finite element analysis. It was found that the shape of the thread profile has a profound effect upon the magnitude of the stresses in the bone and that very small threads of a favourable profile can be quite effective.
假设骨骼中的高应力峰值会引发骨吸收，那么螺旋形骨植入物的设计应使在一定载荷作用下骨骼中产生的峰值应力最小化。基于理想化假设，本研究的目的是分析轴向加载的螺旋形骨植入物的螺纹尺寸和轮廓变化对皮质骨中应力峰值大小的影响。通过轴对称有限元分析进行了这项研究。结果发现，螺纹轮廓的形状对骨骼中的应力大小有深远影响，而且具有良好轮廓的非常小的螺纹可能相当有效。
