ONE OR TWO SCREWS IN THE FRACTURE OF THE ODONTOID PROCESS? EVALUATION USING COMPUTED TOMOGRAPHY

Objective:To evaluate the bone area of the odontoid process through computed tomography and its relation with the area of one and two screws in the male and female subjects.Methods:188 CT scans of adults were analyzed. The isthmus area was selected and the transverse diameter was measured at 1.2 mm from the base of odontoid.Results:After placement of a screw, the odontoid area remains with 82% of free bone for both men and women. With two screws, 45.6% of women, had a free bone area of the odontoid process between 50% and 75% and 54.4% were above 75%. 26.6% men had percentage from 50% to 75% of free bone area and 73.4% above 75% (p=0.07). After the placement of two screws, the bone area was, in average, 77.3% in men and 75.4% in women. Using the Student t-test, the differences between the average of percentage of free bone area in men and women are significantly lower in women (p=0.0012).Conclusion:The pre-operative planning through CT can help to choose the number of screws in the odontoid process. The choice should be particularly careful when using two screws in women.

Bibliographic Details

Main Authors:	Amaral,Carlos Alexandre Botelho do, Nakagawa,Edgar Taira, Ferreira,Leonardo Ternis, Franco,José Sergio, Pires,Robinson Esteves Santos, Cavallari,Flávio, Labronici,Pedro José
Format:	Digital revista
Language:	English
Published:	Sociedade Brasileira de Coluna 2015
Online Access:	http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1808-18512015000300210
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