Pedicle screw breakage and loosening remain as clinical complications of short
segment instrumentation procedures for spinal stabilization. This study has directly
visualized and measured elastic, plastic and total vertebral pedicle trabecular bone full-field
strains in the regions immediately surrounding the pedicle screw during pedicle
screw insertion by utilizing functional microCT imaging and digital volume correlation.
Human, porcine and polyurethane foam samples were analyzed and compared. Analysis
showed that when osteoporotic human, normal human and porcine pedicle trabecular
bone samples were compared, osteoporotic samples showed higher peak plastic strains
and greater variability of these strains from their means. This suggests that osteoporotic
human samples are non-uniformly elastic and plastic, while normal human and porcine
samples are more uniformly elastic and plastic throughout the trabecular structure. PU-foams
are not appropriate as models for pedicle trabecular bone in the in vivo
environment since strain results showed dissimilar plastic and elastic strain magnitudes
than human and porcine pedicle trabecular bone. This study may aid in the development
of performance criteria for new PU-foams and improved pedicle screw designs. / Graduation date: 2004
| Identifer | oai:union.ndltd.org:ORGSU/oai:ir.library.oregonstate.edu:1957/32025 |
| Date | 11 February 2004 |
| Creators | Moran, Sean T. |
| Contributors | Bay, Brian K. |
| Source Sets | Oregon State University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis/Dissertation |
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