Orr T E, Carter D R, Schurman D J
Rehabilitation Research and Development Center, Veterans Adminstration Medical Center, Palo Alto, California 94304.
Clin Orthop Relat Res. 1988 Jul(232):217-24.
Metal backing of glenoid components for total shoulder replacements and the use of bony ingrowth surfaces on these components have recently been introduced. In this study, finite element analyses were performed to determine the stress fields in the natural glenoid and to calculate the change in bone stresses after implantation of glenoid components of various designs. The effects of metal backing, keel geometry, and superior constraint on bone stresses indicate that stress distributions on the natural glenoid corresponded to bone morphology. Metal-backing the glenoid component may cause slight improvement in stress transfer to cortical bone. Altered fin geometry better stabilized the glenoid component. Superior restraints on the component intending to prevent subluxation increase stresses and may cause earlier loosening than encountered with unconstrained components.
全肩关节置换术中盂肱关节组件的金属背衬以及这些组件上骨长入表面的应用最近已被引入。在本研究中，进行了有限元分析，以确定天然盂肱关节中的应力场，并计算植入各种设计的盂肱关节组件后骨应力的变化。金属背衬、龙骨几何形状和上约束对骨应力的影响表明，天然盂肱关节上的应力分布与骨形态相对应。盂肱关节组件采用金属背衬可能会使向皮质骨的应力传递略有改善。改变鳍的几何形状能更好地稳定盂肱关节组件。旨在防止半脱位的组件上的上约束会增加应力，并且可能比无约束组件更早导致松动。
