Semester of Graduation

Spring 2022


Master of Science (MS)


School of Veterinary Medicine

Document Type




The objective of this study was to improve the accuracy of drilling during the repair of sacroiliac luxation with a 3D-printed patient-specific drill guide (3D-GDT) compared to free-hand drilling technique (FHDT). A blinded, randomized, prospective study was performed including sixteen canine cadavers (20-25 kg) euthanized for reasons not related to the study. Dorsal, bilateral, sacroiliac luxations (SILs) were created experimentally. A pelvic CT was performed pre- and post-drilling. The FHDT was drilled followed by 3D-GDT for each sacrum. CT and 3D measurements of craniocaudal and dorsoventral angles were compared between FHDT and 3D-GDT, as well as deviations of entry and exit points relative to optimal trajectory.

Mean craniocaudal and dorsoventral angles for both CT and 3D measured 3D-GDT (CT 4.2o±3.9 and 3.9o±3.2, respectively; 3D 5.1o±5.1 and 2.8o±2.3 respectively p=0.0006) were lower compared to FHDT (CT 11.8o±4.0, p o ±6.1, p=0.01; 3D 12.4o±5.9, p=0.0006 and 5.3o±5.24, p=0.05) respectively. Entry dorsoventral and end craniocaudal, dorsoventral and 3D linear deviations were reduced with the 3D-GDT. Sacral corridor disruption was present more in FHDT (20%, 3/15) than 3D-GDT (0%). CT and 3D analyses were in strong agreement (r=0.77).

Deviations of drill trajectories were minimized relative to optimal trajectories with the 3D-GDT compared to the FHDT in the dorsoventral and craniocaudal planes. The 3D-GDT improves accuracy of sacral drilling compared to FHDT in canine cadavers.



Committee Chair

Gines, J. Alberto