The feasibility of vibration as a tool to assess spinal integrity

Kawchuk, Gregory N.; Decker, Colleen; Dolan, Ryan; Fernando, Nalin; Carey, Jason P.

doi:10.1016/j.jbiomech.2008.04.023

Cited by 12 publications

(12 citation statements)

References 21 publications

(22 reference statements)

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“…Applied forces of this magnitude, combined with the need to apply these forces in multiple locations if regional mapping is desired, may cause viscoelastic responses and subsequent observer-effects. In comparison, the forces and total testing times associated with the SIMO technique described here appear to have little viscoelastic impact; FRF data are highly reproducible even in the presence of vibration that could be imagined as exacerbating (Kawchuk et al, 2008).…”

Section: Article In Pressmentioning

confidence: 77%

Structural health monitoring to detect the presence, location and magnitude of structural damage in cadaveric porcine spines

Kawchuk¹,

Decker²,

Dolan³

et al. 2009

Journal of Biomechanics

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Section: Article In Pressmentioning

confidence: 77%

Structural health monitoring to detect the presence, location and magnitude of structural damage in cadaveric porcine spines

Kawchuk¹,

Decker²,

Dolan³

et al. 2009

Journal of Biomechanics

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“…Previously, modal parameters succesfully revealed artificially induced structural alterations in human, goat and pig spinal segments (Kasra et al, 1992;Kawchuk et al, 2008Kawchuk et al, , 2009Van Engelen et al, 2011). However, the question remained whether modal parameters can also be obtained succesfully in human spines with mechanical changes due to physiological processes.…”

Section: Discussionmentioning

confidence: 99%

“…Vibration testing has also been used to study structural disruption of the spine. Kasra et al (1992) found that removal of posterior elements slightly decreased the eigenfrequency, although not significantly, and Kawchuk et al (2008) found significant changes in the FRF data before and after successive disc transection and mounting of spinal instrumentation. Van Engelen et al (2011) showed that the eigenfrequencies of goat spinal motion segments for flexion-extension, lateroflexion and axial rotation can be determined by modal testing, and that it is possible to relate specific structural alterations (annulus puncture) to specific changes of the modal parameters (lower eigenfrequency for axial rotation).…”

Section: Introductionmentioning

confidence: 98%

Validation of vibration testing for the assessment of the mechanical properties of human lumbar motion segments

Engelen

Ellenbroek

Royen

et al. 2012

Journal of Biomechanics

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Experimental modal analysis is a non-destructive measurement technique, which applies low forces and small deformations to assess the integrity of a structure. It is therefore a promising method to study the mechanical properties of the spine in vivo. Previously, modal parameters successfully revealed artificially induced spinal injuries. The question remains however, whether experimental modal analysis can be applied successfully in human spinal segments with mechanical changes due to physiological processes. Since quasi-static mechanical testing is considered the "gold standard" for assessing intervertebral stiffness, the purpose of our study was to examine if the mechanical properties derived from vibration testing and quasi-static testing correlate. Six cadaver human spines (L1-L5) were loaded quasi-statically in bending and torsion, while an optical system measured the angular rotations of the individual motion segments. Subsequently, the polysegmental spines were divided into L2-L3 and L4-L5 segments and a shaker was used to vibrate the upper vertebra, while its response was obtained from accelerometers in anteroposterior and mediolateral directions. From the resulting frequency response function the eigenfrequencies (ratio between stiffness and mass) and vibration modes (pattern of motion) were determined. The vibration results showed clear eigenfrequencies for flexion-extension (mean 121.83Hz, SD 40.05Hz), lateroflexion (mean 132.17, SD 34.80Hz) and axial rotation (mean 236.17Hz, SD 81.45Hz). Furthermore, the correlation between static and dynamic tests was significant (r=0.73, p=0.01). In conclusion, the findings from this study show that experimental modal analysis is a valid method to assess the mechanical properties of human lumbar motion segments.

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“…Kawchuk et al . used a structural vibration test to assess the structural integrity of cadaveric porcine spines. In their equipment, an electromechanical shaker produced some short‐duration vibrations (frequency range up to 2000 Hz) and the response signals were acquired from five tri‐axial accelerometers fixed to the spinous processes.…”

Section: Introductionmentioning

confidence: 99%