Lewis Gladius, Duggineni Rajesh
Department of Mechanical Engineering, The University of Memphis, Memphis, TN 38152-3180, USA.
Biomed Mater Eng. 2006;16(5):319-27.
A finite element analysis of the stresses in a construct, comprising a three-dimensional model of the proximal human femur in which the stem of a total hip joint replacement was cemented, was performed. The one-legged standing condition was used, with all applied forces on the proximal femur being considered. These forces were the resultant hip joint reaction force and the forces due to the activation of the abductor, ilio-psoas, and ilio-tibialis muscles. The cortical and cancellous bones were assigned anisotropic elastic properties. It was found that the mean value of the strain energy density at each of the regions considered was considerably higher when debonding was considered at both the cancellous bone-acrylic bone cement and bone cement-stem interfaces (represented using surface-to-surface Coulomb friction, coefficient of friction = 0.22) compared to when perfect bonding conditions were taken to exist at these interfaces. The significance of this finding, together with the study limitations, is discussed.
对一个结构中的应力进行了有限元分析，该结构包括近端人体股骨的三维模型，其中全髋关节置换的柄部用骨水泥固定。采用单腿站立状态，考虑了施加在近端股骨上的所有力。这些力包括髋关节合力以及外展肌、髂腰肌和髂胫束肌肉激活产生的力。皮质骨和松质骨被赋予各向异性弹性特性。结果发现，与在这些界面处采用完美粘结条件相比，当在松质骨 - 丙烯酸骨水泥和骨水泥 - 柄部界面处都考虑脱粘（用面面库仑摩擦表示，摩擦系数 = 0.22）时，所考虑的每个区域的应变能密度平均值都显著更高。讨论了这一发现的意义以及研究局限性。
