Back to Search
Start Over
Shear stiffness in the lower cervical spine: Effect of sequential posterior element injury
- Source :
- Proceedings of the Institution of Mechanical Engineers. Part H, Journal of engineering in medicine. 234(2)
- Publication Year :
- 2019
-
Abstract
- The aim of this study was to determine the effect of the posterior ligaments and facet joints on the shear stiffness of lower cervical functional spinal units in anterior, posterior, and lateral shear. Five functional spinal units were loaded in anterior, posterior, and right lateral shear up to 100 N using a custom-designed apparatus in a materials testing machine. Specimens were tested in three conditions: intact, with the posterior ligaments severed, and with the facet joints removed. There was a significant decrease in anterior stiffness in the 20–100 N load range from 186 (range: 98–327) N/mm in the intact condition to 105 (range: 78–142) N/mm in the disc-only condition (p = 0.03). Posterior stiffness between these condition decreased significantly from 134 (range: 92–182) N/mm to 119 (range: 83–181) N/mm (p = 0.03). There was no significant effect of posterior ligament removal on shear stiffness. No significant differences were found in the lateral direction or in the 0–20 N range for any direction. Under a 100-N shear load, the facet joints played a significant role in the stiffness of the cervical spine in the anterior–posterior direction, but not in the lateral direction.
- Subjects :
- musculoskeletal diseases
Facet (geometry)
Materials science
Shear stiffness
0206 medical engineering
02 engineering and technology
Kinematics
Zygapophyseal Joint
Weight-Bearing
03 medical and health sciences
0302 clinical medicine
medicine
Humans
Range of Motion, Articular
Orthodontics
Mechanical Engineering
Biomechanics
Stiffness
General Medicine
Middle Aged
musculoskeletal system
020601 biomedical engineering
Cervical spine
Biomechanical Phenomena
Shear (geology)
Ligaments, Articular
Cervical Vertebrae
medicine.symptom
030217 neurology & neurosurgery
Subjects
Details
- ISSN :
- 20413033
- Volume :
- 234
- Issue :
- 2
- Database :
- OpenAIRE
- Journal :
- Proceedings of the Institution of Mechanical Engineers. Part H, Journal of engineering in medicine
- Accession number :
- edsair.doi.dedup.....1b114e965d8910f143954ca223d176e7