{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,1]],"date-time":"2026-06-01T16:54:41Z","timestamp":1780332881233,"version":"3.54.1"},"reference-count":34,"publisher":"MDPI AG","issue":"7","license":[{"start":{"date-parts":[[2025,7,19]],"date-time":"2025-07-19T00:00:00Z","timestamp":1752883200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Science and Technology program of the Sichuan Medical Products Administration","award":["2024010"],"award-info":[{"award-number":["2024010"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Veterinary Sciences"],"abstract":"<jats:p>Pedicle screw fixation is a critical technique for stabilizing lumbar fractures in canines, yet the biomechanical implications of insertion angles remain underexplored. This study aims to identify optimal screw trajectories by analyzing stress distribution and deformation patterns in beagle lumbar segments (L6-L7) using finite element analysis (FEA). A 3D finite element model was reconstructed from CT scans of a healthy beagle, incorporating cortical\/cancellous bone, intervertebral disks, and cartilage. Pedicle screws (2.4 mm diameter, 22 mm length) were virtually implanted at angles ranging from 45\u00b0 to 65\u00b0. A 10 N vertical load simulated standing conditions. Equivalent stress and total deformation were evaluated under static loading. The equivalent stress occurred at screw\u2013rod junctions, with maxima at 50\u00b0 (11.73 MPa) and minima at 58\u00b0 (3.25 MPa). Total deformation ranged from 0.0033 to 0.0064 mm, with the highest at 55\u00b0 and the lowest at 54\u00b0. The 58\u00b0 insertion angle demonstrated optimal biomechanical stability with minimal stress concentration, with 56\u201360\u00b0 as a biomechanically favorable range for pedicle screw fixation in canine lumbar fractures, balancing stress distribution and deformation control. Future studies should validate these findings in multi-level models and clinical settings.<\/jats:p>","DOI":"10.3390\/vetsci12070682","type":"journal-article","created":{"date-parts":[[2025,7,21]],"date-time":"2025-07-21T09:33:53Z","timestamp":1753090433000},"page":"682","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Finite Element Analysis of Stress Distribution in Canine Lumbar Fractures with Different Pedicle Screw Insertion Angles"],"prefix":"10.3390","volume":"12","author":[{"given":"Ziyao","family":"Zhou","sequence":"first","affiliation":[{"name":"Teaching Veterinary Hospital, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu 611130, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiaogang","family":"Shi","sequence":"additional","affiliation":[{"name":"Sichuan Wolong National Natural Reserve Administration Bureau, Wenchuan 623006, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jiahui","family":"Peng","sequence":"additional","affiliation":[{"name":"Teaching Veterinary Hospital, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu 611130, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiaoxiao","family":"Zhou","sequence":"additional","affiliation":[{"name":"Chengdu Center for Animal Disease Prevention and Control, Chengdu 610041, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Liuqing","family":"Yang","sequence":"additional","affiliation":[{"name":"Sichuan Institute of Musk Deer Breeding, Sichuan Institute for Drug Control, Chengdu 611130, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhijun","family":"Zhong","sequence":"additional","affiliation":[{"name":"Teaching Veterinary Hospital, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu 611130, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Haifeng","family":"Liu","sequence":"additional","affiliation":[{"name":"Teaching Veterinary Hospital, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu 611130, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9898-5754","authenticated-orcid":false,"given":"Guangneng","family":"Peng","sequence":"additional","affiliation":[{"name":"Teaching Veterinary Hospital, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu 611130, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2933-3645","authenticated-orcid":false,"given":"Chengli","family":"Zheng","sequence":"additional","affiliation":[{"name":"Sichuan Institute of Musk Deer Breeding, Sichuan Institute for Drug Control, Chengdu 611130, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ming","family":"Zhang","sequence":"additional","affiliation":[{"name":"College of Animal Science, Sichuan Agricultural University, Chengdu 611130, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2025,7,19]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"97","DOI":"10.29261\/pakvetj\/2021.002","article-title":"Traumatic lumbosacral joint dislocation in 3 dogs: Clinical presentation, diagnosis, treatment and short-term follow-up","volume":"41","author":"Mennonna","year":"2021","journal-title":"Pak. 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