Gislason M K, Foster E, Bransby-Zachary M, Nash D H
a Institute for Biomedical and Neural Engineering, School of Science and Engineering , University of Reykjavik , Reykjavik , Iceland.
b Faculty of Engineering, Department of Mechanical and Aerospace Engineering , University of Strathclyde , Glasgow , UK.
Comput Methods Biomech Biomed Engin. 2017 Aug;20(10):1113-1121. doi: 10.1080/10255842.2017.1336548. Epub 2017 Jun 5.
Little is known about the mechanics of in vivo loading on total wrist prostheses where many studies have looked at the mechanics of other types of arthroplasty such as for the hip and the knee which has contributed to the overall success of these types of procedures. Currently surgeons would prefer to carry out arthrodesis on the wrist rather than consider arthroplasty as clinical data have shown that the outcome of total wrist arthroplasty is poorer than compared to the hip and knee. More research is needed on the loading mechanisms of the implants in order to enhance the design of future generation implants. This study looks at the load transfer characteristics of the Universal 2 implant using a finite element model of a virtually implanted prosthesis during gripping. The results showed that the loading on the implant is higher on the dorsal and ulnar aspect than on the volar and radial aspect of the implant. The whole load is transmitted through the radius and none through the ulna.
对于全腕关节假体的体内加载力学，人们了解甚少。许多研究关注的是其他类型关节置换术的力学，比如髋关节和膝关节置换术，这些研究推动了此类手术的整体成功。目前，外科医生更倾向于对手腕进行关节融合术，而非考虑关节置换术，因为临床数据表明，全腕关节置换术的效果比髋关节和膝关节置换术更差。为了改进下一代植入物的设计，需要对植入物的加载机制进行更多研究。本研究使用虚拟植入假体在抓握过程中的有限元模型，研究了通用2型植入物 的载荷传递特性。结果表明，植入物背侧和尺侧的载荷高于掌侧和桡侧。整个载荷通过桡骨传递，不通过尺骨传递。
