Yearling laryngeal function in Thoroughbreds that underwent a laryngoplasty differs from controls.
Authors: Hardwick Josephine L, Ahern Benjamin J, Crawford Kylie L, Allen Kate J, Franklin Samantha H
Journal: Equine veterinary journal
Summary
# Editorial Summary: Yearling Laryngeal Function and Prosthetic Laryngoplasty in Thoroughbreds Yearling laryngeal assessments at the point of sale carry substantial economic weight in the Thoroughbred industry, yet little has been known about the laryngeal status of horses that subsequently require prosthetic laryngoplasty (PL). Hardwick and colleagues conducted a case-control study comparing 150 Thoroughbreds that underwent PL between 2019 and 2021 with 600 matched controls, using the Havemeyer grading system to re-evaluate post-sale videoendoscopic recordings in blinded fashion. The findings revealed a sharp risk gradient: whilst yearling laryngeal function (YLF) grade II.1 showed no significantly elevated risk compared with grade I, horses graded II.2 or higher at yearling carried substantially higher odds of requiring PL, with odds ratios of 3.4 for grade II.2, 13.8 for grade III.1, and exponentially higher values for more severe grades. Notably, three-quarters of the PL group had demonstrated grade II.2 or better laryngeal function at yearling assessment, indicating that significant deterioration commonly occurs post-sale rather than being apparent at the sales examination. For practitioners involved in yearling assessment or subsequent clinical management, these data suggest that whilst mild abnormalities (grade II.1) may not warrant immediate concern, horses presenting with grade II.2 dysfunction warrant closer monitoring and should trigger more cautious purchase decisions, given their substantially elevated risk of requiring surgical intervention.
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Practical Takeaways
- •Yearling sale videoendoscopic assessments showing grade II.2 or worse laryngeal dysfunction are at significantly increased risk of requiring surgery later; this should inform purchasing decisions and expected outcomes
- •Many horses requiring prosthetic laryngoplasty had relatively mild yearling findings (≤grade II.2), suggesting laryngeal disease often deteriorates after sale—continued monitoring of horses with early-grade dysfunction is warranted
- •Laryngeal grading at yearling sales has meaningful predictive value for future surgery risk and should be considered alongside other pre-purchase evaluation findings
Key Findings
- •Yearling laryngeal function ≥grade II.2 had 4.61 times higher odds of requiring prosthetic laryngoplasty compared to <grade II.2
- •Yearling laryngeal function ≥grade III.1 had 10.7 times higher odds of requiring prosthetic laryngoplasty compared to <grade III.1
- •Three-quarters of the prosthetic laryngoplasty group had ≤grade II.2 yearling laryngeal function, indicating post-sale deterioration in laryngeal function was common
- •Risk of requiring prosthetic laryngoplasty increased progressively from grade II.2 onwards, with grades III.2 and above showing dramatically elevated odds ratios