Research Papers

Failure Properties and Damage of Cervical Spine Ligaments, Experiments and Modeling

[+] Author and Article Information
Ana Trajkovski

Faculty of Mechanical Engineering,
University of Ljubljana,
Aškerčeva cesta 6,
Ljubljana 1000, Slovenia
e-mail: ana.trajkovski@fs.uni-lj.si

Senad Omerović

Faculty of Mechanical Engineering,
University of Ljubljana,
Aškerčeva cesta 6,
Ljubljana 1000, Slovenia
e-mail: senad.omerovic@fs.uni-lj.si

Marija Hribernik

Medical Faculty,
University of Ljubljana,
Vrazov trg 2,
Ljubljana 1000, Slovenia
e-mail: marjana.hribernik@mf.uni-lj.si

Ivan Prebil

Faculty of Mechanical Engineering,
University of Ljubljana,
Aškerčeva cesta 6,
Ljubljana 1000, Slovenia
e-mail: ivan.prebil@fs.uni-lj.si

Contributed by the Bioengineering Division of ASME for publication in the Journal of Biomechanical Engineering. Manuscript received March 25, 2013; final manuscript received December 30, 2013; accepted manuscript posted January 6, 2014; published online February 13, 2014. Assoc. Editor: Brian D. Stemper.

J Biomech Eng 136(3), 031002 (Feb 13, 2014) (9 pages) Paper No: BIO-13-1156; doi: 10.1115/1.4026424 History: Received March 25, 2013; Revised December 30, 2013; Accepted January 06, 2014

Cervical spine ligaments have an important role in providing spinal cord stability and restricting excessive movements. Therefore, it is of great importance to study the mechanical properties and model the response of these ligaments. The aim of this study is to characterize the aging effects on the failure properties and model the damage of three cervical spine ligaments: the anterior and the posterior longitudinal ligament and the ligamentum flavum. A total of 46 samples of human cadaveric ligaments removed within 24–48 h after death have been tested. Uniaxial tension tests along the fiber direction were performed in physiological conditions. The results showed that aging decreased the failure properties of all three ligaments (failure load, failure elongation). Furthermore, the reported nonlinear response of cervical ligaments has been modeled with a combination of the previously reported hyperelastic and damage model. The model predicted a nonlinear response and damage region. The model fittings are in agreement with the experimental data and the quality of agreement is represented with the values of the coefficient of determination close to 1.

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Fig. 1

(a) PLL column, and (b) bone-ligament-bone units

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Fig. 2

Potted bone-ligament-bone units

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Fig. 3

Better fixture of the PLL

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Fig. 4

(a) Test rig, and (b) fixed sample in chamber of the test rig

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Fig. 5

Scheme of ligament length definition

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Fig. 6

Ligament load-displacement curves

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Fig. 7

Age related changes of (a) ultimate load, (b) ultimate displacement, (c) stiffness, (d) ultimate stress, (e) ultimate strain, and (f) modulus for ALL, PLL, and LF

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Fig. 8

Fitted experimental data for several samples




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