Affatato Saverio, Leardini Walther, Rocchi Mirko, Toni Aldo, Viceconti Marco
Laboratorio di Tecnologia Medica, Instituti Ortopedici Rizzoli, Bologna, Italy.
Artif Organs. 2008 Jan;32(1):13-8. doi: 10.1111/j.1525-1594.2007.00455.x.
Although polyethylene components have been used in the human joint for over 30 years, wear simulation studies are fundamental to assess wear resistance of total joint replacements. This assessment will help to obtain quality control and acquire further knowledge of the tribological processes that involve joint prostheses. As a result, the risk of implant failure of innovative prostheses will be reduced. The aim of the present study was to investigate the influence on wear of the polyethylene tibial inserts against metallic femoral components using a knee simulator following a standardized kinematics protocol (ISO/CD 14243-3.2). Four intact "small" size specimens of the tibial MP 913 were tested in a four-station knee wear simulator for two million cycles. The volumetric weight loss for the ultra-high-molecular-weight-polyethylene (UHMWPE) tibial inserts was 44 +/- 2, 45 +/- 3, and 47 +/- 3 mg for the specimens #1-3, respectively. This study demonstrated a good repeatability among the stations of the knee simulator obtaining weight loss values congruent with those found by other authors using similar test conditions.
尽管聚乙烯部件已在人体关节中使用了30多年，但磨损模拟研究对于评估全关节置换的耐磨性至关重要。这种评估将有助于进行质量控制，并进一步了解涉及关节假体的摩擦学过程。因此，创新假体植入失败的风险将降低。本研究的目的是按照标准化运动学方案（ISO/CD 14243-3.2），使用膝关节模拟器研究聚乙烯胫骨衬垫与金属股骨部件之间的磨损影响。对四个完整的“小”尺寸胫骨MP 913标本在四站膝关节磨损模拟器中进行了两百万次循环测试。标本#1-3的超高分子量聚乙烯（UHMWPE）胫骨衬垫的体积重量损失分别为44±2、45±3和47±3毫克。本研究表明，膝关节模拟器各站之间具有良好的重复性，获得的重量损失值与其他作者在类似测试条件下发现的值一致。
