Title of article
A COMPARISON OF PULLOUT STRENGTH OF PEDICULAR SCREWS BETWEEN DIFFERENT METHODS OF SCREW INSERTION IN POSTERIOR FIXATION OF THORACIC SPINE
Author/Authors
Habib-Allah -Zadeh, P. Department of Orthopedic - Sina Hospital - School of Medicine - Tehran University of Medical Sciences - Tehran, Iran , Mirzashahi, B Department of Orthopedic - Sina Hospital - School of Medicine - Tehran University of Medical Sciences - Tehran, Iran , Sadat, M. M. Department of Orthopedic - Sina Hospital - School of Medicine - Tehran University of Medical Sciences - Tehran, Iran , Siavashi, B Department of Orthopedic - Sina Hospital - School of Medicine - Tehran University of Medical Sciences - Tehran, Iran , Mohammad-Hosseini, S. Mechanic Engineering - Sharif Industrial University of Tehran, -Tehran, Iran , Ziaei-Moayyed, A.A Department of Material Engineering - Sharif Industrial University of Tehran - Tehran, Iran
Pages
4
From page
447
To page
450
Abstract
Pedicle screws provide rigid fixation for instabilities in the lumbar and lumbosacral spine.
Anatomical consideration and potential risk of neurologic complications are the reasons to hesitate
using pedicle screws in the thoracic spine. Twenty moulages similar to human vertebrae were
instrumented with Cotrel-Dubousset (CD) system pedicle screw by intratransverse process,
extrapedicular and intrapedicular methods and pullout strength was measured. There was statistically
significant difference between three techniques. By increasing the length of screw in any method,
pullout strength increased. Average pullout strength in extrapedicular technique was less than two other
techniques in dynamic state. The strongest technique for screw placement was intratransverse process
technique. It seems that intratransverse process technique is safe for posterior fixation of spine.
Keywords
pullout strength , intratransverse process , thoracic , screw spine , Pedicle
Journal title
Astroparticle Physics
Serial Year
2008
Record number
2446200
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