Rancourt D, Shirazi-Adl A, Drouin G, Paiement G
Department of Mechanical Engineering, Ecole Polytechnique, Montréal, Québec, Canada.
J Biomed Mater Res. 1990 Nov;24(11):1503-19. doi: 10.1002/jbm.820241107.
Friction tests between cancellous bone cubes and porous-surfaced metal plates were conducted in order to determine the mechanical properties of the interface in a knee porous-surfaced metal implant. Bone specimens were obtained from fresh frozen amputated tibiae and three metal plates were chosen: titanium bead porous-surfaced, titanium fiber mesh porous-surfaced, and smooth stainless steel. Results show that the friction curve is highly nonlinear. Friction coefficients measured vary between 0.3 and 1.3. The friction coefficient of the interface is independent of the excision site of the bone cubes and of the magnitude of the rate of relative displacement at the interface. The friction coefficient appears to vary slightly with the normal contact pressure for all the metal surfaces. Both porous surfaces have statistically a higher friction coefficient than the smooth surface. This is likely due to the presence of surface asperities whereby the metal ploughs the bone surface. However, no significant differences is observed between bead and fiber mesh types.
为了确定膝关节多孔表面金属植入物中界面的力学性能，对松质骨立方体与多孔表面金属板之间进行了摩擦测试。骨标本取自新鲜冷冻截肢的胫骨，并选择了三种金属板：钛珠多孔表面、钛纤维网多孔表面和平滑不锈钢。结果表明，摩擦曲线高度非线性。测得的摩擦系数在0.3至1.3之间变化。界面的摩擦系数与骨立方体的切除部位以及界面处相对位移速率的大小无关。对于所有金属表面，摩擦系数似乎随法向接触压力略有变化。两种多孔表面在统计学上都比光滑表面具有更高的摩擦系数。这可能是由于存在表面粗糙度，从而使金属对骨表面进行犁削。然而，在珠型和纤维网型之间未观察到显著差异。
