Journal article
Biomechanical studies of a dynamized anterior thoracolumbar implant
Spine (Philadelphia, Pa. 1976), Vol.25(3), pp.306-309
02/01/2000
DOI: 10.1097/00007632-200002010-00008
PMID: 10703101
Abstract
An in vitro investigation into the biomechanical properties of a dynamized anterolateral compression implant that allows controlled subsidence.
To determine the extent to which both modes of the anterolateral compression implant (controlled collapsing and rigid) are able to reestablish the stability of the lumbar spine after L4 corpectomy.
Over time, anterior and posterior spinal implants have been associated with progressive angulation, and occasionally implant failure and breakage. To circumvent this occurrence and provide better graft loading, dynamized or collapsing devices for clinical use have been developed.
Eight fresh calf spines (L1-L6) were placed in a biomechanical testing frame. Pure moments of 6 Nm were loaded onto the intact spine in six directions: flexion, extension, right and left lateral bending, and right and left axial rotation. A total L4 corpectomy then was performed, and the defect grafted with a wooden dowel. Loading was repeated after the specimens were stabilized using the two modes of the anterolateral compression implant in succession.
The results showed that both modes of the implant (the rigid mode in particular) restore the stiffness of the unstable spine to normal levels of flexion, extension, and right and left lateral bending, even to levels exceeding normal. These devices, however, fall short of achieving normal stability in right and left axial rotation.
In the cadaveric calf spine after L4 corpectomy, restoration of stability with a dynamized anterior spinal implant is possible in flexion, extension, and right and left lateral bending, but not in axial rotation.
Details
- Title: Subtitle
- Biomechanical studies of a dynamized anterior thoracolumbar implant
- Creators
- Patrick W Hitchon - Division of Neurosurgery, University of Iowa, Iowa City, USA. patrick-hitchon@uiowa.eduVijay K GoelThomas RoggeNicole M GroslandKoichi SairyoJames Torner
- Resource Type
- Journal article
- Publication Details
- Spine (Philadelphia, Pa. 1976), Vol.25(3), pp.306-309
- DOI
- 10.1097/00007632-200002010-00008
- PMID
- 10703101
- NLM abbreviation
- Spine (Phila Pa 1976)
- ISSN
- 0362-2436
- eISSN
- 1528-1159
- Publisher
- Lippincott Williams & Wilkins; United States
- Language
- English
- Date published
- 02/01/2000
- Academic Unit
- Roy J. Carver Department of Biomedical Engineering; Epidemiology; Orthopedics and Rehabilitation; Surgery; Injury Prevention Research Center; Neurosurgery
- Record Identifier
- 9983995132402771
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