Anglin C, Wyss U P, Nyffeler R W, Gerber C
Sulzer Orthopedics Ltd., P.O. Box 65, 8404, Winterthur, Switzerland.
Clin Biomech (Bristol). 2001 Feb;16(2):144-50. doi: 10.1016/s0268-0033(00)00078-4.
The purpose of this pilot study (n=3) was to compare the loosening performance of glenoid prosthesis design pairs where only one design variable differed.
Glenoids were subjected to dynamic edge loading in a biaxial test setup.
Glenoid component loosening is the primary concern in total shoulder arthroplasty.
After the humeral head was cycled 100,000 times to the superior and inferior edges of the glenoid, the tensile edge displacements were measured under superior and inferior off-center loading.
Based on this study, a rough-backed design had dramatically better loosening performance than a smooth-backed; curved-backed was superior to flat-backed; a less-constrained articular surface was better than a more-constrained articular surface; pegs outperformed a keel; threaded pegs were marginally preferable to cylindrical pegs; and an all-polyethylene design rocked slightly less than a metal-mesh-backed design.
A comparison of the laboratory loosening behavior of glenoid prostheses may lead to improved designs, subsequently leading to a reduction in the incidence of clinical loosening.
本试点研究（n = 3）的目的是比较仅一个设计变量不同的关节盂假体设计对的松动性能。
在双轴测试装置中对关节盂施加动态边缘载荷。
关节盂部件松动是全肩关节置换术中的主要问题。
在肱骨头向关节盂的上边缘和下边缘循环运动100,000次后，在偏心向上和向下加载下测量拉伸边缘位移。
基于本研究，粗糙背设计的松动性能明显优于光滑背设计；弧形背优于平背；约束较小的关节面优于约束较大的关节面；钉优于龙骨；螺纹钉略优于圆柱钉；全聚乙烯设计的晃动略小于金属网背设计。
比较关节盂假体的实验室松动行为可能会改进设计，进而降低临床松动的发生率。
