Evaluation of impingement behaviour in lumbar spinal disc arthroplasty.
Eur Spine J
; 24(9): 2033-46, 2015 Sep.
Article
em En
| MEDLINE
| ID: mdl-24903396
ABSTRACT
INTRODUCTION:
The objective of our in vitro study was to introduce a test method to evaluate impingement in lumbar spinal disc arthroplasty in terms of wear, contact pattern, metal ion concentration and particle release. MATERIAL ANDMETHOD:
Impingement wear simulation was performed on a 6-station spinal wear simulator (Endolab, Germany) on a lumbar spinal disc system (activ L Aesculap AG, Germany) using four different protocols specific to impingement in flexion, in extension, in lateral bending and in combined flexion bending. Impingement contact stress is intentionally created by applying an angular displacement of +2° in addition to the intended range of motion in the impingement direction, whereas a bending moment of 8 Nm remains constant during the impingement phase (plateau).RESULTS:
An average volumetric wear rate of 0.67 mm(3)/million cycles was measured by impingement under flexion, of 0.21 mm(3)/million cycles under extension, of 0.06 mm(3)/million cycles under lateral bending and of 1.44 mm(3)/million cycles under combined flexion bending. The particle size distribution of the cobalt-chromium wear particles released by impingement in flexion (anterior), extension (posterior), lateral bending (lateral) and combined flexion bending (antero-lateral) revealed that most of the detected cobalt-chromium particles were in a size range between 0.2 and 2 µm.CONCLUSION:
The impingement wear simulation introduced here proved to be suitable to predict in vivo impingement behaviour in regard to contact pattern seen on retrieved devices of the activ L lumbar disc arthroplasty design in a pre-clinical test.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Substituição Total de Disco
/
Disco Intervertebral
/
Prótese Articular
/
Vértebras Lombares
Tipo de estudo:
Guideline
/
Prognostic_studies
Limite:
Humans
País/Região como assunto:
Europa
Idioma:
En
Ano de publicação:
2015
Tipo de documento:
Article