Development and Validation of A C0–C7 FE Complex for Biomechanical Study

[+] Author and Article Information
Qing Hang Zhang, Hong Wan Ng

School of Mechanical and Aerospace Engineering,  Nanyang Technological University, Singapore

Ee Chon Teo

School of Mechanical and Aerospace Engineering,  Nanyang Technological University, Singaporemecteo@ntu.edu.sg

J Biomech Eng 127(5), 729-735 (May 04, 2005) (7 pages) doi:10.1115/1.1992527 History: Received May 07, 2004; Revised May 04, 2005

In this study, the digitized geometrical data of the embalmed skull and vertebrae (C0–C7) of a 68-year old male cadaver were processed to develop a comprehensive, geometrically accurate, nonlinear C0–C7 FE model. The biomechanical response of human neck under physiological static loadings, near vertex drop impact and rear-end impact (whiplash) conditions were investigated and compared with published experimental results. Under static loading conditions, the predicted moment-rotation relationships of each motion segment under moments in midsagittal plane and horizontal plane agreed well with experimental data. In addition, the respective predicted head impact force history and the S-shaped kinematics responses of head-neck complex under near-vertex drop impact and rear-end conditions were close to those observed in reported experiments. Although the predicted responses of the head-neck complex under any specific condition cannot perfectly match the experimental observations, the model reasonably reflected the rotation distributions among the motion segments under static moments and basic responses of head and neck under dynamic loadings. The current model may offer potentials to effectively reflect the behavior of human cervical spine suitable for further biomechanics and traumatic studies.

Copyright © 2005 by American Society of Mechanical Engineers
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Figure 1

The obtained surface profile of head and typical cervical vertebrae. (a) Head, (b) C1, (c) C2, (d) C3.

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Figure 2

Finite element mesh of the head and cervical spine model. The completed spine model was configured to contain a lordosis of about 37deg, which is consistent with the neck posture of a seated 50th percentile male.

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Figure 3

Predicted load-displacement curves of head with respect to C7 under physiological moments of 1Nm.

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Figure 4

Comparison of predicted ROM of each motion segment under combined flexion and extension against mean in vitro experimental values with standard deviation (20).

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Figure 5

Comparison of predicted ROM of each cervical segment under axial rotation moment of 1.0Nm against mean in vitro experimental values with standard deviation (19).

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Figure 6

Comparison of predicted resultant head impact force history against experimental corridors. (a) The impact orientation at −15deg; (b) the impact orientation at +15deg.

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Figure 7

Predicted response of the neck in the near-vertex impact

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Figure 8

Comparison of predicted resultant rotational history of head and cervical motion segments (from C2–C3 to C5–C6) against experimental data (21), in which the positive and negative angles represent flexion and extension, respectively.




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