Woo S L, Simon B R, Akeson W H, Gomez M A, Seguchi Y
J Biomed Mater Res. 1983 May;17(3):427-39. doi: 10.1002/jbm.820170304.
Mathematical analysis by finite element modeling methods was used in conjunction with laboratory bench experiments in selecting appropriate stiffness parameters for internal fixation plate designs. Bench experiments performed included tests of an idealized plated magnesium tube and of a plated canine femur. Finite element modeling of the plate-tube and plate-bone structures was also performed, and the computed results were compared with those obtained experimentally. Three types of internal fixation plates--one "rigid" control plate and two less rigid experimental plates--were examined using both the finite element and experimental models. These plates were further examined by finite element modeling of a plated human femur during single stance loading. In all cases, the "rigid" control plate was found to shield the underlying bone from stress, while both experimental plates were found to have significantly less bone stress shielding. Our findings suggest that an improved plate design should have a low axial stiffness but moderate bending and torsional stiffnesses to facilitate fracture healing and bone remodeling without causing osteopenia.
采用有限元建模方法进行数学分析，并结合实验室台架实验，为内固定板设计选择合适的刚度参数。所进行的台架实验包括对理想化的带板镁管和带板犬股骨的测试。还对板 - 管和板 - 骨结构进行了有限元建模，并将计算结果与实验结果进行了比较。使用有限元和实验模型研究了三种类型的内固定板——一块“刚性”对照板和两块刚性较小的实验板。通过对单腿站立负荷下带板人体股骨的有限元建模，对这些板进行了进一步研究。在所有情况下，发现“刚性”对照板会使下方骨骼免受应力，而两块实验板的骨应力遮挡明显较少。我们的研究结果表明，改进的板设计应具有低轴向刚度但适度的弯曲和扭转刚度，以促进骨折愈合和骨重塑，而不会导致骨质减少。
