CT-derived indices of canine osteosarcoma-affected antebrachial strength.
OBJECTIVE
To improve the prediction of fractures in dogs with bone tumors of the distal radius by identifying computed tomography (CT) indices that correlate with antebrachial bone strength and fracture location.


METHODS
Prospective experimental study.


METHODS
Dogs with antebrachial osteosarcoma (n = 10), and normal cadaver bones (n=9).


METHODS
Antebrachia were imaged with quantitative CT prior to biomechanical testing to failure. CT indices of structural properties were compared to yield force and maximum force using Pearson correlation tests.


RESULTS
Straight beam failure (Fs), axial rigidity, curved beam failure (Fc), and craniocaudal bending moment of inertia (MOICrCd) CT indices most highly correlated (0.77 > R > 0.57) with yield and maximum forces when iOSA-affected and control bones were included in the analysis. Considering only OSA-affected bones, Fs, Fc, and axial rigidity correlated highly (0.85 > R > 0.80) with maximum force. In affected bones, the location of minimum axial rigidity and maximum MOICrCd correlated highly (R > 0.85) with the actual fracture location.


CONCLUSIONS
CT-derived axial rigidity, Fs, and MOICrCd have strong linear relationships with yield and maximum force. These indices should be further evaluated prospectively in OSA-affected dogs that do, and do not, experience pathologic fracture.
Department of Anatomy, Physiology and Cell Biology Surgical, School of Veterinary Medicine, University of California-Davis, Davis, California.
Tanya C
TC
Garcia
Department of Radiological Sciences, School of Veterinary Medicine, University of California-Davis, Davis, California.
Michele A
http://orcid.org/0000-0003-0852-0644
MA
Steffey
Department of Radiological Sciences, School of Veterinary Medicine, University of California-Davis, Davis, California.
Allison L
http://orcid.org/0000-0002-8982-2558
AL
Zwingenberger
Department of Radiological Sciences, School of Veterinary Medicine, University of California-Davis, Davis, California.
Leticia
L
Daniel
Department of Anatomy, Physiology and Cell Biology Surgical, School of Veterinary Medicine, University of California-Davis, Davis, California.
Susan M
SM
Stover
D000818:Animals; D001696:Biomechanical Phenomena; D002102:Cadaver; D004283:Dog Diseases / Q000209:etiology* / Q000473:pathology; D004285:Dogs; D050723:Fractures, Bone / Q000473:pathology / Q000662:veterinary*; D005598:Fractures, Spontaneous / Q000662:veterinary*; D006801:Humans; D012516:Osteosarcoma / Q000150:complications / Q000473:pathology / Q000662:veterinary*; D011446:Prospective Studies; D014057:Tomography, X-Ray Computed / Q000379:methods / Q000662:veterinary*