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33rd Annual Scientific Meeting proceedings


Stream:   |   Session: Orthopaedic Short Communications
Date/Time: 05-07-2024 (17:15 - 17:30)   |   Location: Auditorium 2
Accuracy of a novel 3D surgical navigation system developed for an equine cone beam CT equipment: Internal fixation with lag screws in distal limb bones
Rossi E1, Denisova E2, Bocchi L2, Santos I3, Rosa TR3, Lamas LP*3
1EidoLab, Imaginalis, Florence, Italy, 2EidoLab, Dept. Information Engineering, University of Florence, Florence, Italy, 3CIISA, Faculty of Veterinary Medicine, ULisboa, Lisbon, Portugal.

Objectives:

In this study, an optical surgical navigation system, coupled with computed tomography, was tested during lag screw fixation surgery on equine limbs.

Methods:

Three equine cadaver limbs, were used. Screw placements were defined in cases where high accuracy placement is mandatory: Third phalanx, navicular bone, proximal first phalanx and third tarsal bone for a total of nine procedures where 4.5mm cortical screws were placed in lag fashion, mimicking a clinical fracture repair. Real-time CT guidance was employed during screw insertion simulation. Surgery time was documented from the start to the completion of the surgical procedure. Following screw insertion, a CT scan was performed to assess the accuracy of screw placement when compared to an ideal pre-placement, defined in the virtual 3D model.

Results:

Angular and translation deviations in placement were measured for the procedure. Angular deviations ranged from 1.24° to 6.64° while translation deviations from 1.34mm to 8.68mm for the screw head position and from 1.47mm to 11.05mm to the target point. Average surgery time (not including CT scan time and preoperative planning phase), was 7 minutes and 34 seconds.

Conclusions:

The experimental results show that the proposed navigation system can be used in lag screw fixation surgery, assisting the surgeon in obtaining accurate screw placement and to reduce surgery time as well. Further tests should be completed to permit this tool to become a fully functional aid.

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