Abstract
The devices used for isthmic repair in spondylolisthesis must have adequate mechanical features in order to provide immediate stability in the lytic area.A biomechanical study was performed using frozen preserved human vertebrae in which the lytic defect was reproduced. Three diferent techniques (translaminar screw, cable with compression and pediculo laminar screw-hook) were assayed. All specimens were tested in a universal traction- compression machine obtainig strength-deformation curves that were used to obtain stifness values for the tested vertebrae.
The pediculo laminar screw-hook technique provided the stiffest repair achieving 60% of the stifness provided by a human intact vertebra, while the translaminar screw provided 37%. The strength- deformation values obtained by the cable with compression repair technique were not comparable to those obtained by the two other techniques.
| Date of Award | 4 Jul 2002 |
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| Original language | Spanish |
| Supervisor | Antoni Navarro Quilis (Director) & Jaime Roca Burniol (Director) |