Influence of press-fit parameters on the primary stability of uncemented femoral resurfacing implants
Influence of press-fit parameters on the primary stability of uncemented femoral resurfacing implants
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DOI：
10.1016/j.medengphy.2008.04.007
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发表时间：
2009-01-01
影响因子：
2.2
通讯作者：
Morlock, M. M.
中科院分区：
文献类型：
--
作者：
Gebert, A.;Peters, J.;Morlock, M. M.
初期稳定性对于非骨水泥型假体的成功至关重要。它受到植入技术、植入物设计和骨质量的强烈影响。本研究的目的是探讨压配参数对非骨水泥型股骨头表面置换假体初期稳定性的影响。使用人体样本和原型植入物（标称径向干扰170和420 μ m）进行体外研究，以研究干扰对初步稳定性的影响。使用有限元模型评估植入物与骨之间的干扰、摩擦和骨质量的影响。初期稳定性由植入物的扭矩能力表示。该模型预测增加的稳定性与实际的干扰，骨质量和摩擦系数;骨的塑性变形开始在干扰小于100 μ m。然而，在实验上，稳定性与干扰无关。这可能是由于在更高的干扰下骨小梁结构的磨损或塌陷，这不能被模型捕获。实验检测的高标称干扰似乎不太可能导致临床稳定性改善。估计约2500 N的植入力足以实现约30 N/m的扭矩能力，且具有小的过盈（70 μ m）。(C)2008年妇女平等问题国际研究所。由爱思唯尔有限公司出版。保留所有权利。
Primary stability is essential to the success of uncemented prostheses. It is strongly influenced by implantation technique, implant design and bone quality. The goal of this study was to investigate the effect of press-fit parameters on the primary stability of uncemented femoral head resurfacing prostheses. An in vitro study with human specimens and prototype implants (nominal radial interference 170 and 420 mu m) was used to investigate the effect of interference on primary stability. A finite element model was used to assess the influence of interference, friction between implant and bone, and bone quality. Primary stability was represented by the torque capacity of the implant. The model predicted increasing stability with actual interference, bone quality and friction coefficient; plastic deformation of the bone began at interferences of less than 100 mu m. Experimentally, however, stability was not related to interference. This may be due to abrasion or the collapse of trabecular bone structures at higher interferences, which could not be captured by the model. High nominal interferences as tested experimentally appear unlikely to result in improved stability clinically. An implantation force of about 2500N was estimated to be sufficient to achieve a torque capacity of about 30 N m with a small interference (70 mu m). (C) 2008 IPEM. Published by Elsevier Ltd. All rights reserved.