Friedman R J, Laberge M, Dooley R L, O'Hara A L
From the Bioengineering Alliance of South Carolina, Medical University of South Carolina, Charleston; and Clemson University, Clemson, S.C.
J Shoulder Elbow Surg. 1992 Sep;1(5):261-70. doi: 10.1016/S1058-2746(09)80068-2. Epub 2009 Feb 19.
A two-dimensional plane stress model of the natural glenoid was developed with finite element analysis to observe the stress distributions under various loading conditions. Different glenoid prosthetic designs were evaluated with the use of the finite element model in an attempt to elucidate key features for an improved design. These included a keel model, a stair-stepped model, and a wedge model. In addition to the evaluation of these designs, different interfaces were introduced to simulate various environments of the prostheses, and different material combinations were studied. Based on the finite element analysis, the following design parameters were found to be important: (1) an all-polyethylene implant appears to provide a more physiologic stress distribution for nonaxial loads if no soft tissue is present; (2) the presence of a soft-tissue layer causes higher stresses; (3) the stair-stepped and wedge models produced a more natural stress distribution compared with the keel design; and (4) screw orientation was not a significant design parameter.
利用有限元分析建立了天然肩胛盂的二维平面应力模型，以观察不同载荷条件下的应力分布。使用该有限元模型对不同的肩胛盂假体设计进行评估，试图阐明改进设计的关键特征。这些设计包括龙骨模型、阶梯模型和楔形模型。除了对这些设计进行评估外，还引入了不同的界面来模拟假体的各种环境，并研究了不同的材料组合。基于有限元分析，发现以下设计参数很重要：(1) 如果不存在软组织，全聚乙烯植入物似乎能为非轴向载荷提供更符合生理的应力分布；(2) 软组织层的存在会导致更高的应力；(3) 与龙骨设计相比，阶梯模型和楔形模型产生的应力分布更自然；(4) 螺钉方向不是一个重要的设计参数。
