Saleh Khaled J, Bear Brian, Bostrom Mathias, Wright Timothy, Sculco Thomas P
Departments of Orthopaedic Surgery and Public Health Sciences, University of Virginia Health System, Charlottesville, Virginia, USA.
Am J Orthop (Belle Mead NJ). 2008 Oct;37(10):519-22.
Component shape, surface finish, and presence of holes for adjuvant screw fixation should all affect initial stability and hence long-term fixation of total hip acetabular components. We conducted a study to determine stability against edge loading and torsion in commercial implants that differed in these design variables. Components were seated into synthetic cancellous bone blocks, and loads and insertion energies necessary to seat the components were measured. Components were then edge-loaded or twisted to failure. Compared with several hemispherical components, an elliptical component without holes and sintered beads had significantly more stability under both loading conditions. The presence of more holes in hemispherical components significantly improved stability in edge loading but not in torsion. Finally, plasma-spray and small-bead coatings showed improved stability compared with fiber-mesh and large-bead coatings.
髋臼组件的形状、表面光洁度以及用于辅助螺钉固定的孔的存在，都应会影响初始稳定性，进而影响全髋关节髋臼组件的长期固定。我们进行了一项研究，以确定在这些设计变量上存在差异的商用植入物在边缘加载和扭转情况下的稳定性。将组件植入合成松质骨块中，并测量将组件就位所需的载荷和插入能量。然后对组件进行边缘加载或扭转直至失效。与几个半球形组件相比，一个没有孔和烧结珠的椭圆形组件在两种加载条件下都具有显著更高的稳定性。半球形组件中更多孔的存在显著提高了边缘加载时的稳定性，但在扭转时则不然。最后，与纤维网和大珠涂层相比，等离子喷涂和小珠涂层显示出更高的稳定性。
