A Three-Dimensional Motion Model of Loads on the Lumbar Spine: II. Model Validation

1991 ◽  
Vol 33 (2) ◽  
pp. 139-149 ◽  
Author(s):  
William S. Marras ◽  
Carolyn M. Sommerich
Keyword(s):  
Lumbar Spine ◽  
Model Validation ◽  
Three Dimensional ◽  
Motion Model

scholarly journals Three-dimensional distribution of CT attenuation in the lumbar spine pedicle wall

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Tomoyo Y. Irie ◽  
Tohru Irie ◽  
Alejandro A. Espinoza Orías ◽  
Kazuyuki Segami ◽  
Norimasa Iwasaki ◽  
...  
Keyword(s):  
Lumbar Spine ◽  
Age Groups ◽  
Three Dimensional ◽  
Hounsfield Unit ◽  
Lateral Wall ◽  
Ct Attenuation ◽  
Dimensional Distribution ◽  
The Mean ◽  
Pedicle Wall

AbstractThis study investigated in vivo the three-dimensional distribution of CT attenuation in the lumbar spine pedicle wall measured in Hounsfield Unit (HU). Seventy-five volunteers underwent clinical lumbar spine CT scans. Data was analyzed with custom-written software to determine the regional variation in pedicle wall attenuation values. A cylindrical coordinate system oriented along the pedicle’s long axis was used to calculate the pedicular wall attenuation distribution three-dimensionally and the highest attenuation value was identified. The pedicular cross-section was divided into four quadrants: lateral, medial, cranial, and caudal. The mean HU value for each quadrant was calculated for all lumbar spine levels (L1–5). The pedicle wall attenuation was analyzed by gender, age, spinal levels and anatomical quadrant. The mean HU values of the pedicle wall at L1 and L5 were significantly lower than the values between L2–4 in both genders and in both age groups. Furthermore, the medial quadrant showed higher HU values than the lateral quadrant at all levels and the caudal quadrant showed higher HU values at L1–3 and lower HU values at L4–5 than the cranial quadrant. These findings may explain why there is a higher incidence of pedicle screw breach in the pedicle lateral wall.

Two and three dimensional analyses in the flexurally loaded cadaveric lumbar spine

1993 ◽  
Vol 26 (3) ◽  
pp. 349
Author(s):  
K. Droese ◽  
J.F. Cusick ◽  
N. Yoganandan ◽  
F. Pintar
Keyword(s):  
Lumbar Spine ◽  
Three Dimensional

Reliability of Three-dimensional Fluoroscopy For Detecting Pedicle Screw Violations in the Thoracic and Lumbar Spine

Neurosurgery ◽  
2004 ◽  
Vol 54 (5) ◽  
pp. 1138-1143 ◽  
Author(s):  
Michael Y. Wang ◽  
K. Anthony Kim ◽  
Charles Y. Liu ◽  
Paul Kim ◽  
Michael L.J. Apuzzo
Keyword(s):  
Lumbar Spine ◽  
Pedicle Screw ◽  
Three Dimensional ◽  
Thoracic And Lumbar Spine

Statistical shape modeling characterizes three-dimensional shape and alignment variability in the lumbar spine

2018 ◽  
Vol 69 ◽  
pp. 146-155 ◽  
Author(s):  
Justin F.M. Hollenbeck ◽  
Christopher M. Cain ◽  
Jill A. Fattor ◽  
Paul J. Rullkoetter ◽  
Peter J. Laz
Keyword(s):  
Lumbar Spine ◽  
Three Dimensional ◽  
Shape Modeling ◽  
Statistical Shape ◽  
Dimensional Shape ◽  
Statistical Shape Modeling ◽  
Three Dimensional Shape

A Biomechanical Model of Lumbar Spine

2000 ◽  
Author(s):  
Subramanya Uppala ◽  
Robert X. Gao ◽  
Scott Cowan ◽  
K. Francis Lee
Keyword(s):  
Finite Element ◽  
Lumbar Spine ◽  
Experimental Studies ◽  
Three Dimensional ◽  
Biomechanical Model ◽  
Element Model ◽  
Fe Model ◽  
Flexion Extension ◽  
Cortical Shell ◽  
Three Dimensional Finite Element

Abstract The strength and stability of the lumbar spine are determined not only by the bone and muscles, but also by the visco-elastic structures and the interplay between the different components of the spine, such as ligaments, capsules, annulus fibrosis, and articular cartilage. In this paper we present a non-linear three-dimensional Finite Element model of the lumbar spine. Specifically, a three-dimensional FE model of the L4-5 one-motion segment/2 vertebrae was developed. The cortical shell and the cancellous bone of the vertebral body were modeled as 3D isoparametric eight-nodal elements. Finite element models of spinal injuries with fixation devices are also developed. The deformations across the different sections of the spine are observed under the application of axial compression, flexion/extension, and lateral bending. The developed FE models provided input to both the fixture design and experimental studies.

Sign in / Sign up

Export Citation Format

Share Document