Nomenclature, classification, and documentation of catastrophic fractures and associated preexisting injuries in racehorses.
Abstract: Racehorses are susceptible to bone fractures when damage from repetitive, high-magnitude loads incurred during training and racing exceed concurrent damage removal and replacement, resulting in transient periods of focal osteoporosis and bone weakening. Clinically, these events correspond to cortical stress fractures and subchondral bone stress remodeling. Evidence of these preexisting lesions include periosteal callus, endosteal callus, and intracortical focal hyperemia for cortical stress fractures; and subchondral focal hyperemia located superficial to sclerotic compacted trabecular bone tissue for subchondral stress remodeling. These findings must be in direct physical association with an acute fracture to infer that the abnormalities precipitated complete bone fracture. Recognition of preexisting lesions must be conveyed in the autopsy report to the racehorse industry audience because this is the mechanism for education of racehorse trainers, veterinarians, and owners. Standardized anatomic nomenclature, fracture classification, and documentation of gross autopsy findings specific to catastrophic bone fractures in racehorses provides information to empower changes in management of racehorses for the detection and management of mild injuries and prevention of catastrophic fractures.
Publication Date: 2017-02-16 PubMed ID: 28205458DOI: 10.1177/1040638717692846Google Scholar: Lookup
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- Journal Article
Summary
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The research paper investigates the causes and prevention of catastrophic fractures in racehorses, focusing especially on the relationship between pre-existing stress injuries and fracture occurrence, and emphasizes the importance of improved trainer and owner understanding through detailed autopsy reports using standardized terminology.
Background
- Due to their intense physical activity, racehorses are prone to bone fractures, particularly when their bones are weakened by periods of repetitive high-magnitude stress that exceeds the recovery abilities of their bodies.
- This lingering damage is linked to two clinical phenomena: cortical stress fractures (in the outer bone) and subchondral bone stress remodeling (the process where bone tissue beneath cartilage undergoes changes).
Identifying Pre-existing Conditions
- The research details the evidence for these pre-existing conditions – periosteal callus and endosteal callus for cortical stress fractures, and subchondral focal hyperemia for subchondral stress remodeling.
- The authors express the critical need to recognize such anomalies in their connection to subsequent acute fractures: these observable changes must physically coincide with an area of fracturing to be considered as contributing factors.
Importance of Autopsy Reports
- These findings, the authors argue, must be explicitly reported in autopsy results provided to members of the racehorse industry, including trainers, veterinarians, and owners.
- Such transparency in fatality reports is instrumental in promoting understanding about how these injuries occur and can be prevented.
Standardization of Nomenclature and Classification
- The study emphasizes the need for a standardized anatomical nomenclature (consistent naming of anatomical structures) and fracture classification in autopsy reports of catastrophic fractures in racehorses.
- This standardization would provide comprehensive, more easily understandable information that could lead to improvements in racehorse management.
- Such widespread enhanced understanding could potentially inform strategies to identify, manage, and prevent minor injuries, hopefully reducing the incidence of devastating fractures.
Cite This Article
APA
Stover SM.
(2017).
Nomenclature, classification, and documentation of catastrophic fractures and associated preexisting injuries in racehorses.
J Vet Diagn Invest, 29(4), 396-404.
https://doi.org/10.1177/1040638717692846 Publication
Researcher Affiliations
- University of California-Davis, Davis, CA.
MeSH Terms
- Animals
- Biomechanical Phenomena
- Bone Remodeling
- Fractures, Bone / classification
- Fractures, Bone / pathology
- Fractures, Bone / veterinary
- Horse Diseases / mortality
- Horse Diseases / pathology
- Horses
Citations
This article has been cited 3 times.- Stover S, Uzal FA. Autopsies are required for all racehorses at most U.S. racetracks. J Vet Diagn Invest 2022 Nov;34(6):925-926.
- Pan M, Malekipour F, Pivonka P, Morrice-West AV, Flegg JA, Whitton RC, Hitchens PL. A mathematical model of metacarpal subchondral bone adaptation, microdamage and repair in racehorses. J R Soc Interface 2025 Oct;22(231):20250297.
- Schild CO, Nyaoke A, Asin J, Henderson EE, Blea JA, Stover SM, Uzal FA. A retrospective study of radial fractures in racehorses in California, 2006-2022. J Vet Diagn Invest 2025 Jul 23;:10406387251336267.
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