Migration characteristics and primary stability of vertebral body replacement systems in combination with dorso lumbar spondylodeses

Journal
Der Orthopäde  
Volume
31
Issue
5
Start Page
514
End Page
521
Citation
Der Orthopäde 31 (5): 514-521 (2002)
Publisher DOI
10.1007/s00132-001-0294-5
Scopus ID
2-s2.0-0036933982
Publisher
Springer
In order to allow speedy mobilization after vertebral body replacement, high primary stability as well as prevention of implant dislocation are required. It is unclear whether differences between common vertebral body replacement systems exist and whether spreadable implants improve primary stability. Migration characteristics of 3 different vertebral body replacement systems were determined using human lumbar spine specimens. Primary stability was assessed by loading specimens successively in 5 conditions: native, after dorsal spondylodesis, after laminectomy and after vertebral body replacement. Migration was shown to depend on cage design and spike shape. Dorsal spondylodesis in combination with vertebral body replacement reduced flexion/extension movement effectively independent of cage design. Stabilization potential in lateral bending was limited. None of the cages limited movement under torsional loading effectively. The possibility to spread the cage had a positive effect on stabilization.
Subjects
Laminectomy
Migration
Primary stability
Vertebral body replacement
DDC Class
610: Medicine, Health