Abstract：
:The definition of spinal instability is still controversial. For this reason, it is essential to better understand the difference in biomechanical behaviour between healthy and degenerated human spinal segments in vivo. A novel computer-assisted instrument was developed with the objective to characterize the biomechanical parameters of the spinal segment. Investigation of the viscoelastic properties as well as the dynamic spinal stiffness was performed during a minimally invasive procedure (microdiscectomy) on five patients. Measurements were performed intraoperatively and the protocol consisted of a dynamic part, where spinal stiffness was computed, and a static part, where force relaxation of the segment under constant elongation was studied. The repeatability of the measurement procedure was demonstrated with five replicated tests. The spinal segment tissues were found to have viscoelastic properties. Preliminary tests confirmed a decrease in stiffness after decompression surgery. Patients with non-relaxed muscles showed higher stiffness and relaxation rate compared to patients with relaxed muscles, which can be explained by the contraction and relaxation reflex of muscles under fast and then static elongation. The results show the usefulness of the biomechanical characterization of the human lumbar spinal segment to improve the understanding of the contribution of individual anatomical structures to spinal stability.
journal_name
Med Eng Physjournal_title
Medical engineering & physicsauthors
Ambrosetti-Giudici S,Pfenniger A,Krenn MH,Piotrowski WP,Ferguson SJ,Burger Jdoi
10.1016/j.medengphy.2009.07.002subject
Has Abstractpub_date
2009-11-01 00:00:00pages
1063-8issue
9eissn
1350-4533issn
1873-4030pii
S1350-4533(09)00146-5journal_volume
31pub_type
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