SYMPOSIA PAPER Published: 01 January 1985
STP33265S

Loosening of Well-Cemented Total-Hip Femoral Prosthesis Due to Creep of the Cement

Source

A review of previous publications on the mechanical complications of cemented total-hip prosthesis femoral component indicates several failure mechanisms. However, the biomechanical significance of the various reported radiographic phenomena has not been clearly assessed with static testing or with computer models.

A new technique was developed to directly measure internal cement strains in a simulated proximal femur with cemented femoral total-hip prostheses. Static experimental testing of a Delrin plastic-bone-analog with a cemented metallic femoral prosthesis indicated highest cement strains in the proximal-medial aspect of the cement sheath, which correlated with highest cement stresses in the same location in a corresponding finite-element analysis computer model. The most noticeable observation from the cyclic testing was the 73% decrease of cement strains in the proximal-medial region after 4.1 million cycles. This time-dependent behavior, that is, creep, may have significance in the failure mechanisms of cemented femoral total-hip replacement components and should be considered in future static or cyclic experimental testing and computer modeling of such prosthetic components.

Author Information

Ebramzadeh, E
Orthopaedic Biomechanics Laboratory, Orthopaedic Hospital-University of Southern California, Los Angeles, CA
Mina-Araghi, M
Orthopaedic Biomechanics Laboratory, Orthopaedic Hospital-University of Southern California, Los Angeles, CA
Clarke, IC
Orthopaedic Biomechanics Laboratory, Orthopaedic Hospital-University of Southern California, Los Angeles, CA
Ashford, R
Orthopaedic Hospital-University of Southern California, Los Angeles, CA
Price: $25.00
Contact Sales
Related
Reprints and Permissions
Reprints and copyright permissions can be requested through the
Copyright Clearance Center
Details
Developed by Committee: F04
Pages: 373–399
DOI: 10.1520/STP33265S
ISBN-EB: 978-0-8031-4926-7
ISBN-13: 978-0-8031-0427-3