Sensitivity studies of pediatric material properties on juvenile lumbar spine responses using finite element analysis

被引:22
作者
Jebaseelan, D. Davidson [1 ]
Jebaraj, C. [1 ]
Yoganandan, Narayan [2 ]
Rajasekaran, S. [3 ]
Kanna, Rishi M. [3 ]
机构
[1] Anna Univ, Dept Mech Engn, AU FRG Inst CAD CAM, Madras 600025, Tamil Nadu, India
[2] Med Coll Wisconsin, Dept Neurosurg, Milwaukee, WI 53226 USA
[3] Ganga Hosp P Ltd, Dept Orthopaed & Spine Surg, Coimbatore, Tamil Nadu, India
关键词
Pediatric spine; Finite element analysis; Material sensitivity; Growth plate; HUMAN CERVICAL-SPINE; INTERVERTEBRAL DISC; GROWTH; COMPRESSION; MODEL; BODY;
D O I
10.1007/s11517-012-0896-6
中图分类号
TP39 [计算机的应用];
学科分类号
080201 [机械制造及其自动化];
摘要
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.
引用
收藏
页码:515 / 522
页数:8
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