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Vet Comp Orthop Traumatol 2022; 35(02): 119-127
DOI: 10.1055/s-0041-1736648
Clinical Communication

Computed Tomographic Evaluation of the Accuracy of Minimally Invasive Sacroiliac Screw Fixation in Cats

Daniel J. Wills 
1   Faculty of Science, Sydney School of Veterinary Science, University of Sydney, Sydney, Australia
,
Jack Neville-Towle
1   Faculty of Science, Sydney School of Veterinary Science, University of Sydney, Sydney, Australia
,
Juan Podadera
1   Faculty of Science, Sydney School of Veterinary Science, University of Sydney, Sydney, Australia
,
Kenneth A. Johnson 
1   Faculty of Science, Sydney School of Veterinary Science, University of Sydney, Sydney, Australia
› Author Affiliations
Funding The funding was provided for acquisition of the CT images from the Sydney School of Veterinary Science clinical residency research allowance.
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Abstract

Objectives The aim of this study was to report the use of computed tomography (CT) for postoperative evaluation of the accuracy of sacroiliac reduction and minimally invasive screw fixation in a series of five cats.

Methods Medical records between January 2016 and March 2017 of cats presenting to the author's institution were reviewed. Included were cats that had undergone minimally invasive sacroiliac screw fixation with a complete medical record and pre- and postoperative radiographs. Screw size was obtained from the medical records. CT images were acquired prospectively and evaluated to assess joint reduction, relative screw size and screw positioning.

Results Six sacroiliac luxations and 6 screws were available. Fixation was achieved with either a 2.4 (n = 1) or 2.7 mm (n = 5), 316L stainless steel, cortical bone screw. Mean screw size as a proportion of sacral diameter was 47.7%. Sacroiliac reduction >90% in the craniocaudal plane and sacral screw purchase >60% of the sacral width were achieved in 3/5 cases. Mean dorsoventral screw angulation was 1.6 degrees (range: −9.7 to 11.7 degrees) and craniocaudal angulation was −4.5 degrees (range: −16.6 to 6.6 degrees). Complications included screw loosening in the one case of bilateral repair and penetration of the neural canal in one case which was not detected with postoperative radiographic evaluation.

Clinical Significance CT evaluation provides a useful method for the assessment of sacroiliac reduction and the accuracy of screw placement.

Keywords

sacroiliac luxation - computed tomography - cats - minimally invasive approach - screw fixation

Authors' Contributions

D.J.W. and K.A.J. contributed to the conception of study, study design, acquisition of data, data analysis and interpretation, drafting or revising of manuscript, approval of submitted manuscript, and are publicly accountable for relevant content. J.N.-T. contributed to the acquisition of data, data analysis and interpretation and drafting or revising of manuscript while J.P. was involved in acquisition of data and data analysis and interpretation.


Note

A portion of this study was presented at the 47th Annual Conference of the Veterinary Orthopedic Society, Feb 1-8, 2020, Sun Valley, Idaho, United States.


Supplementary Material



Publication History

Received: 02 January 2021

Accepted: 21 September 2021

Article published online:
30 November 2021

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