de Visser H, Rowe C, Pearcy M
School of Engineering Systems, Queensland University of Technology, Brisbane, Queensland, Australia.
Proc Inst Mech Eng H. 2007 Apr;221(3):221-7. doi: 10.1243/09544119JEIM175.
A robotic testing facility for the measurement of joint mechanics was used to determine the significance of tears in the intervertebral disc on the mechanics of the spinal joint. Ten lumbar joints of sheep were dynamically loaded and manipulated. Comparisons were made between the behaviour of the intervertebral disc in flexion and extension at two test speeds. The influence of the posterior elements and of rim lesions was assessed by testing the joint immediately before and after removal of the posterior elements and after the creation of a 4 mm x 10 mm rim lesion in the disc. Stiffness of the spinal joint dropped significantly upon removal of the posterior elements, from 0.81 to 0.23 N m/deg for flexion and from 0.65 to 0.40 N m/deg for extension. Maximum moments dropped 37 per cent for flexion and 63 per cent for extension. The rim lesion caused a further significant stiffness reduction to 0.21 and 0.31 N m/deg respectively. Maximum moments reduced a further 12 per cent and 16 per cent respectively. A higher test speed (2 deg/s instead of 0.5 deg/s) usually did not change these results significantly. The novel six-degrees-of-freedom robotic testing facility used in this study was demonstrated to be an effective system for studying the mechanics of complex biological joints.
一个用于测量关节力学的机器人测试设备被用于确定椎间盘撕裂对脊柱关节力学的影响。对十只绵羊的腰椎关节进行动态加载和操作。在两种测试速度下，对椎间盘在屈伸过程中的行为进行了比较。通过在移除后部结构之前和之后以及在椎间盘上制造一个4毫米×10毫米的边缘损伤之后立即测试关节，评估了后部结构和边缘损伤的影响。移除后部结构后，脊柱关节的刚度显著下降，屈曲时从0.81牛米/度降至0.23牛米/度，伸展时从0.65牛米/度降至0.40牛米/度。最大力矩屈曲时下降了37%，伸展时下降了63%。边缘损伤分别导致刚度进一步显著降低至0.21和0.31牛米/度。最大力矩分别进一步降低了12%和16%。较高的测试速度（2度/秒而不是0.5度/秒）通常不会显著改变这些结果。本研究中使用的新型六自由度机器人测试设备被证明是研究复杂生物关节力学的有效系统。
