Long-term results for Kinemax and Kinematic knee bearings on a six-station knee wear simulator
Long-term results for Kinemax and Kinematic knee bearings on a six-station knee wear simulator
复制标题
六站膝盖磨损模拟器上 Kinemax 和 Kinematic 膝盖轴承的长期结果
DOI：
10.1243/0954411001535462
复制
发表时间：
2000
期刊：
影响因子：
--
通讯作者：
A. Unsworth
中科院分区：
文献类型：
--
作者：
H. Ash;I. C. Burgess;A. Unsworth
摘要对Kinemax和Kinematic（Howmedica Inc.）在达勒姆六站膝关节磨损模拟器上进行膝关节轴承试验。关节面承受65-0°的屈曲/伸展、4.5 - 8.5 mm的前后平移和3 kN的最大轴向载荷。也允许被动外展/内收和内旋/外旋，但是，其中两个工作站具有可产生± 5°主动内旋/外旋的联动系统。在37 °C下，在30%牛血清溶液中对关节面进行了测试，测试循环次数为5.6 × 106次。在试验期间，交换了来自试验站2和3以及试验站4和5的关节面，以研究试验站间变异性的影响。Kinemax关节面的平均磨损率和标准误差为3.00 ± 0.98 mg/106次循环（范围1.33-4.72 mg/106次循环），Kinematic关节面的平均磨损率和标准误差为3.78 ± 1.04 mg/106次循环（范围1.87-4.89 mg/106次循环）。不同关节面设计、增加主动内/外旋转或更换工作站之间的磨损率无显著差异。然而，两种类型的关节面和主动内/外旋转的磨损轨迹不同。磨损率和磨损系数通常低于先前发表的体外磨损结果;然而，这可能是由于轴向载荷和所用润滑剂的差异所致。主动内旋/外旋的磨损痕迹外观与固定膝关节平台上观察到的磨损痕迹外观相当。
Abstract A long-term wear test was performed on Kinemax and Kinematic (Howmedica Inc.) knee bearings on the Durham six-station knee wear simulator. The bearings were subjected to flexion/extension of 65–0°, anterior-posterior translation of between 4.5 and 8.5 mm and a maximum axial load of 3 kN. Passive abduction/adduction and internal/external rotation were also permitted, however, two of the stations had a linkage system which produced ± 5° active internal/external rotation. The bearings were tested at 37 °C in a 30 per cent bovine serum solution and the test was run to 5.6 × 106 cycles. The bearings from stations 2 and 3, and stations 4 and 5 were swapped during the test to investigate the effects of interstation variability. The average wear rate and standard error was 3.00 ± 0.98 mg/106 cycles (range 1.33-4.72 mg/106 cycles) for the Kinemax bearings and 3.78 ± 1.04 mg/106 cycles (range 1.87-4.89 mg/106 cycles) for the Kinematic bearings. There were no significant differences in wear rates between the different bearing designs, the addition of active internal/external rotation or a change of stations. However, the wear tracks were different for the two types of bearings and with active internal/external rotation. The wear rates and factors were generally lower than previously published in vitro wear results; however, this may have been due to a difference in the axial loads and lubricants used. The appearance of the wear tracks with active internal/external rotation was comparable with those seen on explanted knee bearings.