Aesculap AG, Research & Development, Tuttlingen, Germany.
J Biomech. 2013 Feb 1;46(3):491-7. doi: 10.1016/j.jbiomech.2012.10.017. Epub 2012 Nov 13.
The objective of our study was to examine the effect of biphaseal AP translation and IE rotation restraint, using a system defined specifically for posterior stabilised knee designs, on wear, kinematics and particle release in comparison to linear motion restraint as required by the established ISO 14243-1:2002(E) protocol. In the ISOlinear groups, an AP motion restraint of 30 N/mm and an IE rotation restraint of 0.6 Nm/° were applied in the knee wear simulation. In the ISOgap biphaseal groups with PCL sacrificing implants, the restraining AP force was zero in a ±2.5mm range with, externally, a constant of 9.3N/mm applied proportionally to the AP translation of the tibia plateau, whereas the restraining IE torque was zero in a ±6° range with, externally, a constant of 0.13 Nm/° applied proportionally to the IE rotation of the tibia plateau. Using the ISOgap biphaseal protocol on a posterior stabilised knee design, we found an increase of 41% in AP translation and of 131% in IE rotation, resulting in a 3.2-fold higher wear rate compared to the results obtained using the ISOlinear protocol. Changes in AP translation and IE rotation ligament motion restraints have a high impact on knee joint kinematics and wear behaviour of a fixed bearing posterior stabilised knee design.
我们的研究目的是检查双相 AP 平移和 IE 旋转约束的效果，使用专为后稳定型膝关节设计定义的系统，与既定 ISO 14243-1:2002(E) 协议要求的线性运动约束相比，观察其对磨损、运动学和颗粒释放的影响。在 ISOlinear 组中，在膝关节磨损模拟中，AP 运动约束为 30N/mm，IE 旋转约束为 0.6Nm/°。在具有 PCL 牺牲植入物的 ISOgap 双相组中，在 ±2.5mm 范围内，AP 约束力为零，外部施加与胫骨平台 AP 平移成比例的 9.3N/mm 的恒定值，而 IE 约束扭矩在 ±6°范围内为零，外部施加与胫骨平台 IE 旋转成比例的 0.13Nm/°的恒定值。在后稳定型膝关节设计上使用 ISOgap 双相协议，我们发现 AP 平移增加了 41%，IE 旋转增加了 131%，与使用 ISOlinear 协议相比，磨损率增加了 3.2 倍。AP 平移和 IE 旋转韧带运动约束的变化对膝关节运动学和固定轴承后稳定型膝关节设计的磨损行为有很大影响。
