A biomechanical study of standard posterior pelvic ring fixation versus a posterior pedicle screw construct.
Injury
; 46(8): 1491-6, 2015 Aug.
Article
em En
| MEDLINE
| ID: mdl-25986670
ABSTRACT
OBJECTIVES:
The purpose of this study was to biomechanically test a percutaneous pedicle screw construct for posterior pelvic stabilisation and compare it to standard fixation modalities.METHODS:
Utilizing a sacral fracture and sacroiliac (SI) joint disruption model, we tested 4 constructs in single-leg stance an S1 sacroiliac screw, S1 and S2 screws, the pedicle screw construct, and the pedicle screw construct+S1 screw. We recorded displacement at the pubic symphysis and SI joint using high-speed video. Axial stiffness was also calculated. Values were compared using a 2-way ANOVA with Bonferroni adjustment (p<0.05).RESULTS:
In the sacral fracture model, the stiffness was greatest for the pedicle screw+S1 construct (p<0.001). There was no significant difference between the pedicle screw construct and S1 sacroiliac screw (p=1). For the SI joint model, the S1+S2 SI screws had the largest overall load and stiffness (p<0.001). The S1 screw was significantly stronger than pedicle screw construct (p=0.001).CONCLUSIONS:
The pedicle screw construct biomechanically compares to currently accepted methods of fixation for sacral fractures when the fracture is uncompressible. It should not be used for SI joint disruptions as one SI or an S1+S2 are significantly stiffer and cheaper.Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Articulação Sacroilíaca
/
Fraturas Ósseas
/
Fixação Interna de Fraturas
/
Instabilidade Articular
Tipo de estudo:
Evaluation_studies
Limite:
Humans
Idioma:
En
Revista:
Injury
Ano de publicação:
2015
Tipo de documento:
Article
País de afiliação:
Estados Unidos