Peters C L, Bachus K N, Craig M A, Higginbotham T O
Orthopaedic Bioengineering Research Laboratory, 20 North 2030 East, Room 190, University of Utah Medical Center, Salt Lake City, UT 84112, USA.
J Arthroplasty. 2001 Feb;16(2):216-24. doi: 10.1054/arth.2001.20537.
Finite element studies show that the highest cement stresses are located at the most proximal and distal ends of the prosthesis. In vitro biomechanical and histologic analyses of autopsy-retrieved cemented femoral components show these areas to be associated with cement-prosthesis debonding. In this study, cement strains were measured in 2 geometrically different femoral stems in paired cadaver femora: A straight, collared, moderately tapered stem (Centralign) was compared with an anatomically curved, collarless, dramatically tapered stem (Scientific Hip Prosthesis [SHP]). Results showed that the maximum strain and the overall strain profile differed between the 2 stems. The Centralign had peak strains located at the most proximal gauge positions, whereas the peak strains of the SHP were located around the middle of the femoral stem. Minimization of cement strain, especially at the crucial proximal and distal areas of the stem, by altering component design may be able to reduce cement-prosthesis debonding and improve clinical results.
有限元研究表明，骨水泥的最高应力位于假体的最近端和最远端。对尸检获取的骨水泥固定股骨组件进行的体外生物力学和组织学分析表明，这些区域与骨水泥 - 假体脱粘有关。在本研究中，在配对的尸体股骨中测量了两种几何形状不同的股骨干中的骨水泥应变：将一个直的、有领的、中等锥度的股骨干（Centralign）与一个解剖学弯曲的、无领的、显著锥度的股骨干（科学髋关节假体[SHP]）进行了比较。结果表明，两种股骨干之间的最大应变和整体应变分布不同。Centralign的峰值应变位于最近端的测量位置，而SHP的峰值应变位于股骨干中部附近。通过改变组件设计使骨水泥应变最小化，尤其是在股骨干关键的近端和远端区域，可能能够减少骨水泥 - 假体脱粘并改善临床结果。
