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An internal fixator for posterior application to short segments of the thoracic, lumbar, or lumbosacral spine. Design and testing.
- Source :
-
Clinical orthopaedics and related research [Clin Orthop Relat Res] 1986 Feb (203), pp. 75-98. - Publication Year :
- 1986
-
Abstract
- A new spinal implant has been designed and biomechanical testing completed, intended for application to "short-segment" spinal defects such as disc degeneration, fracture, spondylolisthesis, or tumor. Major improvements over currently available devices include: only 2-3 vertebrae are spanned, not 5-7 as with Harrington rods; true three-dimensional fixation is achieved, preventing such problems as hook or rod dislocation; three-dimensional adjustment is easily accomplished, allowing fracture or spondylolisthesis reduction to be readily performed; attachment to vertebrae is by means of transpedicular screws eliminating deliberate encroachment into the spinal canal, such as Luque wires or Harrington hooks; no special alignment between screws is needed (such as with holes or slots in a plate), allowing screw placement to fully conform to anatomic structures; and laminectomy sites and lumbosacral junction are readily instrumented. Background investigations presented here for design of this device include: CT-defined pedicle morphometry showing that screws may be larger than those currently used; effect of pitch, minor diameter, and tooth profile on screw pull-out strength; mechanical testing of a compact, three-dimensionally adjustable, strong, nonloosening articulating clamp; and establishing of the relationship between depth of penetration and strength of fixation of transpeduncular screws.
Details
- Language :
- English
- ISSN :
- 0009-921X
- Issue :
- 203
- Database :
- MEDLINE
- Journal :
- Clinical orthopaedics and related research
- Publication Type :
- Academic Journal
- Accession number :
- 3956000