Med Biol Eng Comput - Sensitivity studies of pediatric material properties on juvenile lumbar spine responses using finite element analysis.

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Resumo

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 8-year-old 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.

Resumo Limpo

object studi determin sensit materi properti juvenil spine extern intern respons use finit element model compress flexionextens bend moment methodolog includ exercis yearold juvenil lumbar spine use parametr procedur model includ vertebr centrum growth plate lamina pedicl transvers process spinous process disc annulus nucleus various ligament sensit analysi conduct vari modulus elast various compon first simul done use mean materi properti addit simul done compon correspond low high materi properti variat extern displacementrot intern stressstrain respons determin compress flexionextens bend result indic compress disc properti sensit bone properti impli elev role disc mode flexionextens moment ligament properti domin compon suggest various ligament juvenil spine play key role modul bend behavior chang growth plate stress associ ligament properti explain import growth plate pediatr spine potenti implic progress deform

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