Accuracy and Safety of Image-Guided Freehand Pin Placement in Canine Cadaveric Vertebrae.

Samer, Eva S.; Forterre, Franck; Rathmann, Justus M. K.; Stein, Veronika M.; Precht, Christina M.; Guevar, Julien (2021). Accuracy and Safety of Image-Guided Freehand Pin Placement in Canine Cadaveric Vertebrae. Veterinary and comparative orthopaedics and traumatology : VCOT, 34(05), pp. 338-345. Thieme 10.1055/s-0041-1731808

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Objective: The aim of this study was to validate an imaging technique for evaluation of spinal surgery accuracy and to establish accuracy and safety of freehand technique in the thoracolumbar spine of large breed dogs.

Study design: After thoracolumbar spine computed tomography (CT), 26 drilling corridors were planned then drilled to receive 3.2 mm positive profile pins using a freehand technique. After pin removal, CT was repeated. All entry points, exit points and angles of the preoperative planned trajectories were compared with postoperative ones using an image registration and fusion technique by three observers. Corridor coordinates for entry and exit points were evaluated in three dimensions and angles were measured in one plane. Intraclass correlation coefficient (ICC) was used to establish the imaging technique reliability and descriptive statistics were used to report on the freehand technique accuracy. Safety was evaluated using a vertebral cortical breach grading scheme.

Results: Intraclass correlation coefficient for the entry points, exit points and angle were 0.79, 0.96 and 0.92 respectively. Mean deviations for the entry points, exit points and angle were 3.1 mm, 6.3 mm and 7.6 degrees respectively. Maximum deviations were 6.3 mm, 11.0 mm and 16.4 degrees. Most deviations were lateral and caudal. All corridors were judged as safe.

Conclusion: The imaging technique reliability was good to excellent to study spinal surgery accuracy. Implant deviations should be anticipated when planning stabilization surgery in large breed dogs using the freehand-guided technique.

Item Type:

Journal Article (Original Article)

Division/Institute:

05 Veterinary Medicine > Department of Clinical Veterinary Medicine (DKV) > DKV - Clinical Neurology
05 Veterinary Medicine > Department of Clinical Veterinary Medicine (DKV) > Small Animal Clinic > Small Animal Clinic, Surgery
05 Veterinary Medicine > Department of Clinical Veterinary Medicine (DKV) > DKV - Clinical Radiology
05 Veterinary Medicine > Department of Clinical Veterinary Medicine (DKV) > Small Animal Clinic

UniBE Contributor:

Samer, Eva Salomé; Forterre, Franck; Stein, Veronika Maria; Precht, Maria Christina and Guevar, Julien Jean

Subjects:

600 Technology > 630 Agriculture
500 Science > 570 Life sciences; biology
500 Science > 590 Animals (Zoology)
600 Technology > 610 Medicine & health

ISSN:

0932-0814

Publisher:

Thieme

Language:

English

Submitter:

Manuel Roland Schmidli

Date Deposited:

11 Feb 2022 15:23

Last Modified:

11 Feb 2022 15:23

Publisher DOI:

10.1055/s-0041-1731808

PubMed ID:

34298579

BORIS DOI:

10.48350/164759

URI:

https://boris.unibe.ch/id/eprint/164759

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