Effect of lordosis angle change after lumbar/lumbosacral fusion on sacrum angular displacement: a finite element study.
Eur Spine J
; 23(11): 2369-74, 2014 Nov.
Article
em En
| MEDLINE
| ID: mdl-25231905
ABSTRACT
PURPOSE:
To assess and characterize the sacrum angular displacements in response to lumbar lordosis after lumbar/lumbosacral fusion.METHODS:
A finite element model of the lower lumbar spine-pelvis was established and used to simulate the posterior fusion at L3-L5 and L4-S1. The lordosis angle in the fusion segments was set to five different conditions with respect to the intact model 10° less than intact, 5° less than intact, same as intact, 5° more than intact, and 10° more than intact. Variations of the sacrum angular displacements with lordosis changes were analyzed under loading setting of axial compression, flexion, extension, lateral bending, and axial rotation.RESULTS:
Compared with the intact lordosis, both increased and decreased lumbar lordosis angles caused the sacrum angular displacements to be increased. The lordosis angle increased by 10° induced the most substantial increase in sacrum angular displacements. In addition, the sacrum angular displacements of the L4-S1 fusion model at different lordosis angles were higher than those of the L3-L5 fusion model.CONCLUSION:
The sacrum angular displacements occur as a result of the fusion surgery (L4-S1) and the changes in lumbar lordosis.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Sacro
/
Fusão Vertebral
/
Lordose
/
Vértebras Lombares
Tipo de estudo:
Diagnostic_studies
Limite:
Adult
/
Humans
/
Male
Idioma:
En
Revista:
Eur Spine J
Assunto da revista:
ORTOPEDIA
Ano de publicação:
2014
Tipo de documento:
Article