Effects of angle and laminectomy on triangulated pedicle screws
Küçük Resim Yok
Tarih
2007
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Churchill Livingstone
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
We aimed to demonstrate the effect of angle and laminectomy on paired pedicle screws to determine whether a 90 degrees screw angle is optimal as has been previously suggested. According to the angle between right and left screws, 28 calf vertebrae were divided into three groups and instrumented as follows: Group I: 60 degrees screw angle; Group II: 90 degrees angle; Group III: 60 degrees angle with laminectomy. The screws were connected using rods and cross-fixators and tested to peak pullout force. Triangulated pedicle screws provided 76.5% more pullout strength than single screws. Most of the specimens failed through loss of convergence angle (toggling of screws on the rods) and subsequent uni- or bilateral screw pullout. Mean +/- SD peak loads were: Group I: 2071 +/- 622 N; Group II: 1753 +/- 497 N; Group III: 2186 +/- 587 N. The differences were not significant (p > 0.05). 90 degrees triangulation was not associated with a superior pullout performance versus conventional 60 degrees triangulation, suggesting that achieving additional triangulation angle is not necessary to obtain increased pullout strength. Laminectomy did not alter the effect of triangulation on fixation strength. (c) 2006 Elsevier Ltd. All rights reserved.
Açıklama
Anahtar Kelimeler
Animal Models, Biomechanics, Bone Screw, Internal Fracture Fixation, Testing, Triangulation, Pullout Strength, Biomechanical Analysis, Lumbar Spine, Fixation, Fusion
Kaynak
Journal Of Clinical Neuroscience
WoS Q Değeri
Q4
Scopus Q Değeri
Q2
Cilt
14
Sayı
12
