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A Biomimetic Hip Joint Simulator and its Application in in vitro Study of the Integrity of Replacement Cemented Hip

Journal of Bionic Engineering 2005年第4期2卷 177-185页

作者： Liu Chao-zong S. M. Green N. D. Watkins A. W. McCaskie Department of Materials University of Oxford Parks Road Oxford OX1 3PH UK Centre for Biomedical Engineering University of Durham Durham DH1 3LE UK depuy cmw Blackpool FY4 4QQ UK Department of Orthopaedic Surgery University of Newcastle Newcastle upon Tyne NE2 4HH UK

A biomimetic hip joint simulator that can be used to evaluate the outcome of the cemented total hip replacement has been designed, manufactured and evaluated. The simulator produces motion in the extension/flexion plane, with a socket to rotate internal/externally. At the same time a dynamic loading cycle is applied. A validation test was performed on a cemented femoral stem within a novel composite femur. The hone quality has a strong effect on the stem migration and on the integrity of the interfaces. The migration of the stem is a combination of 3-D translation and rotation of the stem. Under the same loading conditions, weak bone allows more stem migration than strong bone. There is a great decrease in the strength of the stem-cement interface after the dynamic test, and the weak bone composite exhibited a greater reduction in interfacial strength than the strong bone composite. The decrease of the interfacial strength indicates that the primary bonding between the stem and the cement mantle had deteriorated and the integrity of stem-cement interface was damaged. The study demonstrates the value of using a hip joint simulator to investigate stem migration and interface integrity within the cemented hip replacement, suggesting that method can be used for in vitro evaluation of the biomaterials used in the cemented hip replacements.

关键词： hip joint simulator stem migration interface failure hip replacement bone

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