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Medial femoral condylar subchondral cysts in Chilean horses breed: prevalence and characteristics
Suazo, Macarena
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Introduction
Subchondral bone cysts (SBC) can originate from trauma or during development due to failure in endochondral ossification, potentially causing poor performance and lameness [1]. To the authors knowledge there are no prevalence studies in the Chilean horse breed. The aim of this study is to determine the prevalence of SBC on the medial femoral condyle (MFC-SBC) on Chilean horse breed.
Materials and Methods
Stifle radiographs (LM, CdCr and Cd60L-CrMO) were obtained from 200 Chilean horses, aged 2-12 years. SBCs were classified using the scale described by Santschi et. al. [1].
Results
This study found a prevalence of MFC-SBC of 22.5%. Within affected horses,19% were classified as grade 1, 0.5% as grade 2, 1% as grade 4, 2% as grade 6 and no affected horses were found with grade 3 and 5.
Discussion/Conclusion
The prevalence of MFC-SBC in this study was 22.5%, which was higher than the previous 3.8%, 2% and 5.6% reported in Thoroughbreds [2-3]. However, it is lower than the 41.4% reported in Quarter horses [4]. Comparison among the studies have to be done carefully due to the difference in classification criteria used in other studies.
In this study, within the prevalence of 22,4% of SCBC in Chilean horse breed, 19% were classified as MFC flattening. If we not consider MFC flattening in our study, we would have a total prevalence of 3.5%, and this result would be closer than previous reports in Thoroughbred [2,3]. However, if MFC flattening were not considered in the Quarter Horse study, they would have a prevalence of 19.8% [4], remaining above our results.
This study represents the first step toward describing the prevalence in SCBC in Chilean horse breed.
References
1. Santschi EM, Williams JM, Morgan JW, Johnson CR, Bertone AL, Juzwiak JS. Preliminary investigation of the treatment of equine medial femoral condylar subchondral cystic lesions with a transcondylar screw. Vet Surg. 2015;44(3):281-288. https://onlinelibrary.wiley.com/doi/full/10.1111/j.1532- 950X.2014.12199.x
2. Castle K. Investigating the Genetic and Genomic Basis of Osteochondrosis in Thoroughbred Horses from Australia and New Zealand [Tesis doctoral]. University of Sydney; 2012. https://ses.library. usyd.edu.au/bitstream/handle/2123/9369/2012_K_Castle_Thesis.pdf?sequence=1&isAllowed=y Russell J, Matika O, Russell T, Reardon RJM. Heritability and prevalence of selected osteochondrosis lesions in yearling Thoroughbred horses. Equine Vet J. 2017;49(3):282-287. https://www.ncbi. nlm.nih.gov/pmc/articles/PMC5412687/
3. Contino EK, Park RD, Mc Ilwraith CW. Prevalence of radiographic changes in yearling and 2yearold Quarter Horses intended for cutting. Equine Vet J. 2012;44(2):185-195. https://pubmed.ncbi.nlm.nih. gov/21815932/
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About
Affiliation of the authors at the time of publication
Hospital Clinico Veterinario Unidad Equino UN, Unidad Equinos, Santiago, Chile
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