کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
3062725 1187497 2007 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effects of angle and laminectomy on triangulated pedicle screws
موضوعات مرتبط
علوم زیستی و بیوفناوری علم عصب شناسی عصب شناسی
پیش نمایش صفحه اول مقاله
Effects of angle and laminectomy on triangulated pedicle screws
چکیده انگلیسی

We aimed to demonstrate the effect of angle and laminectomy on paired pedicle screws to determine whether a 90° 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° screw angle; Group II: 90° angle; Group III: 60° 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° triangulation was not associated with a superior pullout performance versus conventional 60° 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.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Clinical Neuroscience - Volume 14, Issue 12, December 2007, Pages 1186–1191
نویسندگان
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