Atwood Sara A, Currier John H, Mayor Michael B, Collier John P, Van Citters Douglas W, Kennedy Francis E
Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire 03755, USA.
J Arthroplasty. 2008 Apr;23(3):431-40. doi: 10.1016/j.arth.2007.06.005.
Whereas fixed-bearing total knee arthroplasty (TKA) designs secure the polyethylene bearing to the tibial tray, mobile-bearing TKAs allow the bearing to move relative to the tray. This study evaluated wear performance of the rotational articulation of the Low Contact Stress Rotating Platform mobile-bearing TKA (DePuy, Warsaw, Ind) by analyzing 100 retrievals. All retrieved bearings showed rotation surface damage, but severity of the damage did not correlate with duration. Rotation surface damage appeared to be caused by contaminant particles, which produced curvilinear scratches that were longer than the normal rotational excursion of the knee. Wear measurement indicated that wear was relatively uniform, long-term wear rates were low (mean, 54 mm(3)/y for durations >2 years) and decreased with longer duration, and damaged appearance did not correspond to high wear.
固定平台全膝关节置换术（TKA）将聚乙烯衬垫固定于胫骨托，而活动平台TKA则允许衬垫相对于胫骨托移动。本研究通过分析100例翻修病例评估了低接触应力旋转平台活动平台TKA（迪普伊公司，印第安纳州华沙）旋转关节的磨损性能。所有翻修衬垫均显示旋转面损伤，但损伤严重程度与使用时间无关。旋转面损伤似乎是由污染物颗粒导致的，这些颗粒产生的曲线划痕长于膝关节的正常旋转行程。磨损测量表明，磨损相对均匀，长期磨损率较低（使用时间>2年时平均为54 mm³/年），且随使用时间延长而降低，并损伤外观与高磨损并不对应。
