Idiopathic Scoliosis Analysis by Finite Element Model of Spine : Effect of Posterior Constraint by Spinal Ligaments

2001 ◽  
Vol 2001.13 (0) ◽  
pp. 120-121
Author(s):  
Masahiro TODOH ◽  
Masao TANAKA ◽  
Sohei EBARA
Keyword(s):  
Finite Element ◽  
Idiopathic Scoliosis ◽  
Finite Element Model ◽  
Element Model ◽  
Spinal Ligaments

Quantifying Motion Across a Solid Lumbar Interbody Fusion Using a Finite Element Model

2003 ◽  
Author(s):  
Ashutosh D. Khandha ◽  
Sasidhar S. Vadapalli ◽  
Scott A. Holekamp ◽  
Vijay K. Goel ◽  
Christopher M. Bono ◽  
...  
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Element Model ◽  
Scientific Methods ◽  
Flexion Extension ◽  
Residual Motion ◽  
Cortical Shell ◽  
Solid Fusion ◽  
Spinal Ligaments ◽  
Lumbar Spinal

Clinical assessment of pseudarthrosis or solid fusion is based on the residual motion across the “fused” segment (Kowalski et al, 2001). Dynamic flexion/extension (F/E) radiographs are commonly used to determine residual motion. Despite widespread use, it is unclear what the appropriate “cut-off” criteria to declare a fusion solid should be, with recommendations ranging from 0 to 5°. These values have not been derived by scientific methods. The present study was initiated to predict the angular sagittal motion across simulated lumbar interbody fusions (IF) using a Finite Element Model (FEM) of the ligamentous lumbar spinal segment. Anterior and posterior lumbar interbody fusions were simulated at the L3–L4 level as per the clinical procedure. Varying degrees of fusion were taken into account and the fusion mass was the simulated as a cancellous core with a cortical shell. The results indicated that 0.5° to 5.14° of angular motion can occur depending on fusion location and degree of completeness. While continuous bone might be noted at surgical exploration, this amount of motion may enable persistent loading of remaining structures, such as the annulus or spinal ligaments. In our view, this may prompt a redefinition of clinically “solid fusion”.

scholarly journals Evaluation of a Patient-Specific Finite-Element Model to Simulate Conservative Treatment in Adolescent Idiopathic Scoliosis

2015 ◽  
Vol 3 (1) ◽  
pp. 4-11 ◽  
Author(s):  
Claudio Vergari ◽  
Gwenael Ribes ◽  
Benjamin Aubert ◽  
Clayton Adam ◽  
Lotfi Miladi ◽  
...  
Keyword(s):  
Finite Element ◽  
Adolescent Idiopathic Scoliosis ◽  
Conservative Treatment ◽  
Idiopathic Scoliosis ◽  
Finite Element Model ◽  
Element Model ◽  
Patient Specific

A Finite Element Model for the Design of Local Skin Flaps

1986 ◽  
Vol 19 (4) ◽  
pp. 807-824
Author(s):  
Wayne F. Larrabee ◽  
J.A. Galt
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Element Model ◽  
Skin Flaps ◽  
Local Skin
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