Joint Replacement Surgeons of Indiana Research Foundation Center for Hip and Knee Surgery, Mooresville, Indiana 46158, USA.
J Arthroplasty. 2011 Aug;26(5):777-82. doi: 10.1016/j.arth.2010.07.021. Epub 2010 Sep 25.
Clinical success of unicompartmental knee arthroplasty (UKA) is on the rise and is dependent on multiple patient, implant, and surgical factors. Tibial subsidence has been clinically reported as a cause of failure in UKA with an all-polyethylene tibial design in the absence of metal backing, yet the role of metal backing UKA tibial components on tibial loading is not fully understood. In this study, composite tibiae were implanted with medial all-polyethylene fixed-bearing or metal-backed UKA tibial components and a 1.5-kN load applied in 3 different contact positions simulating femoral translation during gait. All-polyethylene tibial components exhibited significantly higher strain measurements in each femoral position. This study demonstrates the role that metal backing plays on generating an even loading distribution while diminishing the development localized regions of excessive loading across the medial tibial cortex.
单髁膝关节置换术（UKA）的临床成功率正在上升，这取决于多个患者、植入物和手术因素。在没有金属背衬的全聚乙烯胫骨设计的 UKA 中，胫骨下沉已被临床报道为失败的原因，然而，金属背衬 UKA 胫骨组件对胫骨加载的作用尚未完全了解。在这项研究中，复合胫骨植入了内侧全聚乙烯固定轴承或金属背衬 UKA 胫骨组件，并在模拟步态中股骨平移的 3 个不同接触位置施加了 1.5kN 的载荷。全聚乙烯胫骨组件在每个股骨位置都显示出显著更高的应变测量值。本研究表明，金属背衬在产生均匀的载荷分布方面发挥了作用，同时减少了胫骨内侧皮质过度载荷的局部区域的发展。
