Femoral Component Insertion Monitoring Using Human Cadaveric Specimens

Andrew Crisman, Rose-Hulman Institute of Technology
Molly McCuskey, University of New Mexico
Nathanael Yoder, Harvey Mudd College
Phillip Cornwell, Rose-Hulman Institute of Technology
R. Michael Meneghini, St. Vincent Center for Joint Replacement


The purpose of this study is to identify a means to supplement a surgeon's tactile and auditory senses by monitoring the insertion of a tapered cementless femoral component and to identify features that indicate when the femoral component is optimally seated prior to intraoperative fracture from further impacts.   This work is motivated by anecdotal evidence of an increase in fractures associated with the insertion of the component when using emerging minimally invasive surgical techniques.    In this study eight human anatomic specimen femurs were prepared for a cementless femoral component by an orthopedic surgeon using standard implant-specific instrumentation.  The femoral component was instrumented with accelerometers and acceleration data was obtained as the femoral component was being impacted.  Acoustic measurements were also taken using a microphone.   This paper discusses the experimental set-up, the signal processing techniques used, and the subsequent results.