Biomechanical testing of a PEEK-based dynamic instrumentation device in a lumbar spine model.
Clin Biomech (Bristol, Avon)
; 44: 67-74, 2017 May.
Article
en En
| MEDLINE
| ID: mdl-28342975
ABSTRACT
BACKGROUND:
The purpose of this study was to investigate the range-of-motion after posterior polyetheretherketone-based rod stabilisation combined with a dynamic silicone hinge in order to compare it with titanium rigid stabilisation.METHODS:
Five human cadaveric lumbar spines with four vertebra each (L2 to L5) were tested in a temperature adjustable spine-testing set-up in four trials (1) native measurement; (2) kinematics after rigid monosegmental titanium rod instrumentation with anterior intervertebral bracing of the segment L4/5; (3) kinematics after hybrid posterior polyetheretherketone rod instrumentation combined with a silicone hinge within the adjacent level (L3/4) and (4) kinematics after additional decompression with laminectomy of L4 and bilateral resection of the inferior articular processes (L3). During all steps, the specimens were loaded quasi-statically with 1°/s with pure moment up to 7.5Nm in flexion/extension, lateral bending and axial rotation.FINDINGS:
In comparison to the native cadaveric spine, both the titanium device and polyetheretherketone-based device reduce the range-of-motion within the level L4/5 significantly (flexion/extension reduction of 77%, p<0.001; lateral bending reduction of 62%, p<0.001; axial rotation reduction of 71%, p<0.001). There was a clear stabilisation effect after hybrid-instrumentation within the level L3/4, especially in flexion/extension (64%, p<0.001) and lateral bending (62%, p<0.001) but without any effect on the axial rotation. Any temperature dependency has not been observed.INTERPRETATION:
Surprisingly, the hybrid device compensates for laminectomy L4 and destabilising procedure within the level L3/4 in comparison to other implants. Further studies must be performed to show its effectiveness regarding the adjacent segment instability.Palabras clave
Texto completo:
1
Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Dispositivos de Fijación Ortopédica
/
Polietilenglicoles
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Fusión Vertebral
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Estenosis Espinal
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Titanio
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Rango del Movimiento Articular
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Cetonas
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Vértebras Lumbares
Tipo de estudio:
Prognostic_studies
Límite:
Aged
/
Aged80
/
Female
/
Humans
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Male
/
Middle aged
Idioma:
En
Revista:
Clin Biomech (Bristol, Avon)
Asunto de la revista:
ENGENHARIA BIOMEDICA
/
FISIOLOGIA
Año:
2017
Tipo del documento:
Article