The influence of tibial tray design on the wear of fixed-bearing total knee replacements
The influence of tibial tray design on the wear of fixed-bearing total knee replacements
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DOI：
10.1243/09544119jeim434
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发表时间：
2008-11-01
期刊：
影响因子：
1.8
通讯作者：
Fisher, J.
中科院分区：
文献类型：
--
作者：
Galvin, A.;Jennings, L. M.;Fisher, J.
碎片引起的骨质溶解表面磨损的线索是全膝关节置换术（TKR）中潜在的长期问题。胫骨托和超高分子量聚乙烯插入物之间的磨损被认为是造成磨损的原因。本研究调查了胫骨托设计对固定轴承 TKR 磨损的影响。具体来说，本研究调查了材料的表面光洁度和胫骨托锁定机构的设计特征对十字形保持 (CR) 和后稳定设计的固定轴承膝盖磨损的影响。采用 Co-Cr 的新型固定轴承胫骨托设计和改进的锁定机构显着减少了聚乙烯磨损，从每 10(6) 周期 22.8 +/- 6.0 mm(3) 减少到 15.9 +/- 2.9与之前采用 CR 设计的钛合金托盘相比，每 10(6) 次循环每 10(6) 毫米(3) 毫米。磨损率与夹入胫骨托的固定轴承插入件的磨损率相似，表明磨损的减少是由于背面磨损的减少。在测试的两种运动条件下，十字形保持设计和后稳定设计的磨损率没有显着差异。
Debris-induced osteolysis Clue to surface wear is a potential long-term problem in total knee replacements (TKRs). Wear between the tibial tray and ultra-high molecular weight polyethylene insert is thought to contribute to the wear. This Study investigated the influence of tibial tray design on the wear of fixed-bearing TKRs. Specifically, this study investigated the influence of the material's Surface finish and design characteristics of the locking mechanism of the tibial tray on the wear in fixed-bearing knees for both cruciate-retaining (CR) and posterior-stabilized designs.A new fixed-bearing tibial tray design using Co-Cr and with an improved locking mechanism significantly reduced polyethylene wear from 22.8 +/- 6.0 mm(3) per 10(6) cycles to 15.9 +/- 2.9 mm(3) per 10(6) cycles compared with a previous titanium alloy tray with a CR design. The wear rates were similar to those of a fixed-bearing insert clamped into a tibia] tray, Suggesting that the decrease in wear was due to a reduction in backside wear. There was no significant difference between the wear rates of a cruciate-retaining design and a posterior-stabilized design under the two kinematic conditions tested.