Use of computed tomography to define a sacral safe corridor for placement of 2.7 mm cortical screws in feline sacroiliac luxation

Philp, H., Durand, A. and De Vicente, F. (2018) Use of computed tomography to define a sacral safe corridor for placement of 2.7 mm cortical screws in feline sacroiliac luxation. Journal of Feline Medicine and Surgery, 20(6), pp. 487-493. (doi: 10.1177/1098612X17716847) (PMID:28639458)

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Abstract

Objectives: This study aimed to define a safe corridor for 2.7 mm cortical sacroiliac screw insertion in the dorsal plane (craniocaudal direction) using radiography and CT, and in the transverse plane (dorsoventral direction) using CT in feline cadavers. A further aim was to compare the values obtained by CT with those previously reported by radiography in the transverse plane. Methods: Thirteen pelvises were retrieved from feline cadavers and dissected to expose one of the articular surfaces of the sacrum. A 2.7 mm screw was placed in the sacrum to a depth of approximately 1 cm in each exposed articular surface. Dorsoventral radiography and CT scanning of each specimen were performed. Multiplanar reconstructions were performed to allow CT evaluation in both the dorsal and transverse planes. Calculations were made to find the maximum, minimum and optimum angles for screw placement in craniocaudal (radiography and CT) and dorsoventral (CT) directions when using a 2.7 mm cortical screw. Results: Radiographic measurement showed a mean optimum craniocaudal angle of 106° (range 97–112°). The mean minimum angle was 95° (range 87–107°), whereas the mean maximum angle was 117° (108–124°). Measurement of the dorsal CT scan images showed a mean optimum craniocaudal angle of 101° (range 94–110°). The mean minimum angle was 90° (range 83–99°), whereas the mean maximum angle was 113° (104–125°). The transverse CT scan images showed a mean dorsoventral minimum angle of 103° (range 95–113°), mean maximum angle of 115° (104–125°) and mean optimum dorsoventral angle of 111° (102–119°). Conclusions and relevance: An optimum craniocaudal angle of 101° is recommended for 2.7 mm cortical screw placement in the feline sacral body, with a safety margin between 99° and 104°. No single angle can be recommended in the dorsoventral direction and therefore preoperative measuring on individual cats using CT images is recommended to establish the ideal individual angle in the transverse plane.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Philp, Ms Helen and De Vicente Collado, Dr Felipe
Authors: Philp, H., Durand, A., and De Vicente, F.
College/School:College of Medical Veterinary and Life Sciences > School of Veterinary Medicine
Journal Name:Journal of Feline Medicine and Surgery
Publisher:SAGE
ISSN:1098-612X
ISSN (Online):1532-2750
Published Online:22 June 2017
Copyright Holders:Copyright © 2017 The Authors
First Published:First published in Journal of Feline Medicine and Surgery 20(6):487-493
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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