Evaluation of the appearance of osteochondrosis lesions by two radiographic examinations in sport horses aged from 12 to 36 months.
Authors: Van Cauter Raphaël, Serteyn Didier, Lejeune Jean-Philippe, Rousset Alycia, Caudron Isabelle
Journal: PloS one
Summary
# Editorial Summary Osteochondrosis represents a significant developmental concern in young sport horses, yet the natural history of lesion progression beyond 12 months remains poorly characterised. This retrospective radiographic study tracked 58 Walloon sport horses with serial standardised examinations at mean ages of 407 and 680 days, evaluating fetlocks, hocks and stifles for evidence of osteochondrosis (OC) and osteochondrosis dissecans (OCD) using independent assessment by three veterinarians. Of 20 horses presenting with lesions, a quarter (25%) demonstrated measurable change between examinations—including appearance, disappearance, or progression of individual lesions—indicating that radiographic findings are not static after the first year of life, despite substantial methodological limitations inherent to the retrospective design. These findings have important implications for clinical decision-making: initial diagnosis should not necessarily trigger permanent management restrictions, repeat imaging may be justified in selected cases before finalising long-term prognosis, and timing of radiographic screening protocols warrants reconsideration given the dynamic nature of these lesions during the critical 12–36 month growth window. Further prospective work with standardised imaging protocols and inter-examiner reliability testing is needed to establish robust guidelines for diagnosis and monitoring intervals in young sport horses.
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Practical Takeaways
- •Radiographic interpretation of young horses (12-36 months) requires awareness that OC/OCD lesions are dynamic; lesions may appear, disappear, or change, so timing and serial radiographs are important for accurate diagnosis and prognosis
- •A single radiographic examination may miss developing lesions or fail to detect lesions that have self-resolved, supporting the value of repeat imaging when clinical signs persist or for breeding/purchasing decisions
- •Management decisions in young sport horses should account for the possibility of lesion evolution; discuss with owners that some lesions may not be permanent and serial monitoring may be warranted before making irreversible decisions about training or career
Key Findings
- •25% of osteochondrosis lesions (9/36) demonstrated appearance, disappearance, or evolution between two radiographic examinations separated by approximately 273 days
- •6.9% of affected horses (4/20) presented osteochondrosis lesions during only one examination, indicating either new appearance or resolution
- •Osteochondrosis lesions continue to evolve after 12 months of age in young sport horses, contrary to previous assumptions of static lesions