Kocak Sait, Sekercioglu Tezcan
Department of Mechatronics Engineering, Pamukkale University, Denizli, Turkey.
Department of Mechanical Engineering, Pamukkale University, Denizli, Turkey.
Proc Inst Mech Eng H. 2019 Nov;233(11):1183-1195. doi: 10.1177/0954411919877305. Epub 2019 Sep 23.
In joint replacement surgery, the critical point in the success of cemented implants is the stabilisation between the implant and bone. The stronger the interlocking achieved on both the implant-cement interface and the cement-bone interface, the more durable is the surgical intervention. However, to date, it has not been possible to prevent aseptic loosening of hip implants, thus making a revision surgery necessary after a period of about 10 years. In this study, the tensile and shear strengths of the implant-cement and cement-bone interfaces and factors which can affect these strengths such as sandblasting parameters and implant material choice were investigated experimentally. The stresses on the total hip replacement interfaces were then determined via finite element analysis and the findings compared with the strength values obtained from the mechanical tests. The total hip replacement prosthesis was designed using SolidWorks software, and material properties and boundary conditions were modelled with the ANSYS Workbench software. Stresses due to the loads applied to the femur head had exceeded the highest tensile and shear strength values obtained by the classical test methods and damaged the contact surfaces in some regions. In light of these findings, the damage sites of the interfaces were determined.
在关节置换手术中，骨水泥型植入物成功的关键点在于植入物与骨骼之间的稳定。在植入物 - 骨水泥界面和骨水泥 - 骨界面实现的联锁越强，手术干预就越持久。然而，迄今为止，尚无法防止髋关节植入物的无菌性松动，因此在大约10年后需要进行翻修手术。在本研究中，通过实验研究了植入物 - 骨水泥和骨水泥 - 骨界面的拉伸和剪切强度以及可能影响这些强度的因素，如喷砂参数和植入材料选择。然后通过有限元分析确定全髋关节置换界面上的应力，并将结果与机械测试获得的强度值进行比较。使用SolidWorks软件设计全髋关节置换假体，并使用ANSYS Workbench软件对材料特性和边界条件进行建模。由于施加在股骨头的载荷所产生的应力超过了经典测试方法获得的最高拉伸和剪切强度值，并在某些区域损坏了接触面。根据这些发现，确定了界面的损伤部位。
