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Nondestructive evaluation of bone cement and bone cement/metal interface failure

By M. Browne, J.R.T. Jeffers and N. Saffari

Abstract

To quantify the failure mechanisms related to the loosening of cemented hip joint<br/>replacements, novel techniques, capable of monitoring, nondestructively, the initiation and<br/>progression of failure during in vitro fatigue tests, were employed. Fatigue testing of model<br/>cement and cement-stem test pieces was monitored using acoustic emission (AE) sensors. Once<br/>damage was detected, an ultrasonic imaging system was used to obtain an image of the damage<br/>site and to measure the stiffness of the affected region. This method of examination provided a<br/>detailed insight into the internal crack propagation and delamination patterns. Initial work<br/>was conducted on bulk cement specimens subjected to bending and tension. The second stage<br/>of the work examined a model stem-cement interface under tensile opening loading conditions.<br/>A novel ultrasonic technique was used to measure the bond quality at the cement-metal<br/>interface. Progressive delamination was identified over time, and the AE technique was able to<br/>identify critical areas of delamination before they could be identified conclusively by<br/>ultrasonic imaging. The work has demonstrated the potential of the AE technique as a tool for<br/>the preclinical assessment of total hip replacements

Topics: Q1
Year: 2010
OAI identifier: oai:eprints.soton.ac.uk:143229
Provided by: e-Prints Soton
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