Mayo Clinic, Rochester, MN 55905, USA.
Clin Orthop Relat Res. 2010 Feb;468(2):345-50. doi: 10.1007/s11999-009-0911-x. Epub 2009 Jun 19.
We designed and implemented an in vitro bench test to simulate and identify potential biomechanical causes for hip squeaking with alumina ceramic-on-ceramic bearing surfaces. All bearings were third-generation alumina ceramic with a 32-mm head coupled with a 56-mm acetabular component with a 32-mm ceramic insert. Conditions for testing were normal gait, high load, stripe wear, stripe wear in extreme load, metal transfer, edge wear with extreme load, and microfracture. Each condition was tested two times in dry conditions and two times in a lubricated condition with 25% bovine serum. Squeaking was reproduced in all dry conditions. It occurred quickly with high load, stripe wear, or metal transfer. Once squeaking occurred, it did not stop. Squeaking disappeared for all conditions when a small amount of lubricant was introduced. In lubricated conditions, squeaking was only reproduced for the material transfer condition. Our observations suggest squeaking is a problem of ceramic-ceramic lubrication and that this noise occurs when the film fluid between two surfaces is disrupted. Material (metal) transfer was the only condition that led to squeaking in a lubricated situation.
我们设计并实施了一项体外台架测试，以模拟和识别具有氧化铝陶瓷-陶瓷轴承表面的髋关节吱吱声的潜在生物力学原因。所有的轴承都是第三代氧化铝陶瓷，头直径为 32 毫米，与 56 毫米髋臼组件和 32 毫米陶瓷嵌体相匹配。测试条件包括正常步态、高负荷、条纹磨损、极端负荷下的条纹磨损、金属转移、极端负荷下的边缘磨损和微骨折。每种情况在干燥条件下测试两次，在含有 25%牛血清的润滑条件下测试两次。在所有干燥条件下都能重现吱吱声。在高负荷、条纹磨损或金属转移时，它会很快出现。一旦出现吱吱声，它就不会停止。当引入少量润滑剂时，所有情况下的吱吱声都会消失。在润滑条件下，只有在材料转移条件下才能重现吱吱声。我们的观察表明，吱吱声是陶瓷-陶瓷润滑的问题，这种噪音发生在两个表面之间的膜流体被破坏时。只有在润滑条件下，材料（金属）转移才会导致吱吱声。
