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Title of Journal: Med Biol Eng Comput

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Abbravation: Medical & Biological Engineering & Computing

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Springer-Verlag

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DOI

10.1007/978-1-4684-8833-3_8

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1741-0444

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Sensitivity studies of pediatric material properti

Authors: D Davidson Jebaseelan C Jebaraj Narayan Yoganandan S Rajasekaran Rishi M Kanna
Publish Date: 2012/04/07
Volume: 50, Issue: 5, Pages: 515-522
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Abstract

The objective of the study was to determine the sensitivity of material properties of the juvenile spine to its external and internal responses using a finite element model under compression and flexion–extension bending moments The methodology included exercising the 8yearold juvenile lumbar spine using parametric procedures The model included the vertebral centrum growth plates laminae pedicles transverse processes and spinous processes disc annulus and nucleus and various ligaments The sensitivity analysis was conducted by varying the modulus of elasticity for various components The first simulation was done using mean material properties Additional simulations were done for each component corresponding to low and high material property variations External displacement/rotation and internal stress–strain responses were determined under compression and flexion–extension bending Results indicated that under compression disc properties were more sensitive than bone properties implying an elevated role of the disc under this mode Under flexion–extension moments ligament properties were more dominant than the other components suggesting that various ligaments of the juvenile spine play a key role in modulating bending behaviors Changes in the growth plate stress associated with ligament properties explained the importance of the growth plate in the pediatric spine with potential implications in progressive deformities

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