Flexibility and fatigue evaluation of oblique as compared with anterior lumbar interbody cages with integrated endplate fixation
| Autor: | William J. Camisa, Glenn R. Buttermann, Andrew L. Freeman, James R. Malcolm |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Adult
Male medicine.medical_treatment Lumbar vertebrae 03 medical and health sciences 0302 clinical medicine Lumbar Cadaver Bone plate medicine Humans Range of Motion Articular Pliability Fatigue Aged Fixation (histology) 030222 orthopedics Lumbar Vertebrae business.industry Lumbosacral Region General Medicine Anatomy Middle Aged Biomechanical Phenomena Spinal Fusion medicine.anatomical_structure Spinal fusion Female Range of motion business Cage Bone Plates 030217 neurology & neurosurgery |
| Zdroj: | Journal of Neurosurgery: Spine. 24:54-59 |
| ISSN: | 1547-5654 |
| DOI: | 10.3171/2015.4.spine14948 |
| Popis: | OBJECT This study was undertaken to quantify the in vitro range of motion (ROM) of oblique as compared with anterior lumbar interbody devices, pullout resistance, and subsidence in fatigue. METHODS Anterior and oblique cages with integrated plate fixation (IPF) were tested using lumbar motion segments. Flexibility tests were conducted on the intact segments, cage, cage + IPF, and cage + IPF + pedicle screws (6 anterior, 7 oblique). Pullout tests were then performed on the cage + IPF. Fatigue testing was conducted on the cage + IPF specimens for 30,000 cycles. RESULTS No ROM differences were observed in any test group between anterior and oblique cage constructs. The greatest reduction in ROM was with supplemental pedicle screw fixation. Peak pullout forces were 637 ± 192 N and 651 ± 127 N for the anterior and oblique implants, respectively. The median cage subsidence was 0.8 mm and 1.4 mm for the anterior and oblique cages, respectively. CONCLUSIONS Anterior and oblique cages similarly reduced ROM in flexibility testing, and the integrated fixation prevented device displacement. Subsidence was minimal during fatigue testing, most of which occurred in the first 2500 cycles. |
| Databáze: | OpenAIRE |
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