DocumentCode :
604159
Title :
Stress Distribution at the Bone-cement Interface Changes during Kyphoplasty Rehabilitation
Author :
Purcell, P. ; Tyndyk, M. ; McEvoy, F. ; Tiernan, S. ; Morris, S.
Author_Institution :
Centre of Appl. Sci. for Health, Inst. of Technol. Tallaght, Dublin, Ireland
fYear :
2013
fDate :
3-5 May 2013
Firstpage :
65
Lastpage :
66
Abstract :
Balloon Kyphoplasty uses an inflatable bone tamp and cement augmentation to repair vertebral compression fractures. A recent clinical study observed a 78% re-collapse rate in patients showing a radiolucent phenomenon at the bone-cement interface following Kyphoplasty. Two experimental studies showed significant height loss following Balloon Kyphoplasty under cyclical loads. The present study investigates the alteration in load angle corresponding to this height loss and its effect on load transfer to the bone-cement interface. A validated finite element model of a human thoracolumbar spine was segmented into a single L1 vertebral body and modified to replicate bilateral Balloon Kyphoplasty. Cement was modeled using prolate spheroids surrounded by an interface region divided into anterior, middle and posterior sections. Interface thickness was calculated using a mathematical model with a bone volume fraction of 0.3 and 50% bone compaction. An 800N load was applied at angles of 0o and 20o from the vertebral axis. Results indicate that a change in the applied load angle significantly alters the principal stress components and directions across the interface region. This alteration in loading must be considered in the context of the highly compliant interface region and therefore is hypothesized to be a contributory factor to vertebral re-collapse.
Keywords :
biomechanics; biomedical materials; bone; cements (building materials); finite element analysis; fracture mechanics; patient rehabilitation; stress analysis; Kyphoplasty rehabilitation; balloon Kyphoplasty; bone-cement interface changes; cement augmentation; height loss; highly compliant interface region; human thoracolumbar spine; inflatable bone tamp; load transfer; mathematical model; patients; principal stress components; prolate spheroids; radiolucent phenomenon; single L1 vertebral body; stress distribution; validated finite element model; vertebral axis; vertebral compression fractures; vertebral re-collapse; Bones; Finite element analysis; Injuries; Load modeling; Loading; Mathematical model; Stress;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Biomedical Engineering Conference (SBEC), 2013 29th Southern
Conference_Location :
Miami, FL
Print_ISBN :
978-1-4799-0624-6
Type :
conf
DOI :
10.1109/SBEC.2013.41
Filename :
6525678
Link To Document :
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