Miegel R E, Walker P S, Nelson P C, Inadomi J, Needelman L, Maxine M
J Orthop Res. 1986;4(4):486-93. doi: 10.1002/jor.1100040412.
Low pressure sensitive Fujifilm was used to measure the load distribution between the resected tibial surface and a tibial component at axial loads up to 3,000 N for a rigid interface, a compliant interface of dacron double-sided velour, and a cemented interface. The pressure patterns consisted of a multitude of small red dots, generally reflecting the slight irregularities of the cut surface and the stiffness of the cancellous bone at the surface. The pressure patterns were photographed with high-contrast film and input into a computer using a photodiode matrix camera. The data were analyzed to yield the number of contact points for each sample. The velour was more effective in distribution of load to the proximal tibia than the rigid and cemented interfaces, while there was no significant difference between the cemented interface and the rigid interface. A second series of tests showed significant increases in contact points from rigid to one layer to two layers of velour. Cyclic axial loading tests were performed to study the characteristics of rigid and compliant interfaces in a model of in vitro subsidence. Static pressure patterns taken at regular intervals showed that subsidence occurred in vitro in up to 1/3 of the tibias, and that the regions of load transfer could change with time. A model of subsidence was proposed and it was suggested that a velour layer could inhibit the subsidence.
使用对低压敏感的富士胶片来测量在高达3000 N的轴向载荷下，切除的胫骨表面与胫骨组件之间在刚性界面、涤纶双面丝绒柔顺界面和骨水泥固定界面处的载荷分布。压力模式由大量小红点组成，总体上反映了切割表面的轻微不规则以及表面松质骨的硬度。使用高对比度胶片拍摄压力模式，并通过光电二极管矩阵相机将其输入计算机。对数据进行分析以得出每个样本的接触点数量。与刚性界面和骨水泥固定界面相比，丝绒在将载荷分布到胫骨近端方面更有效，而骨水泥固定界面和刚性界面之间没有显著差异。第二组测试表明，从刚性界面到一层丝绒再到两层丝绒，接触点显著增加。进行了循环轴向加载测试，以研究体外下沉模型中刚性界面和柔顺界面的特性。定期拍摄的静态压力模式表明，多达三分之一的胫骨在体外发生了下沉，并且载荷传递区域可能随时间变化。提出了一个下沉模型，并表明丝绒层可以抑制下沉。
