Biomechanical testing of three constructs for prosthetic laryngoplasty in horses demonstrates advantages of differing metallic implants in the arytenoid cartilage.
Authors: Ysebaert Machiel P, Johnson James, Marie Ulrika, Campos Arian, Verchrerin Anouk, Ducharme Norm G, Rossignol Fabrice, Luedke Lauren K
Journal: Veterinary surgery : VS
Summary
# Editorial Summary: Prosthetic Laryngoplasty Constructs in Horses Recurrent laryngeal neuropathy remains a significant performance-limiting condition in horses, and the biomechanical durability of surgical repair constructs directly influences clinical outcomes. Researchers compared three laryngoplasty approaches—a novel tie-bolt metallic implant (TB), a suture anchor system (SA), and conventional suture-only repair—using cadaveric equine larynges subjected to progressive mechanical testing including cyclic loading (3000 cycles at 5–50 N) and ultimate failure analysis. The suture anchor construct required the least force to achieve adequate arytenoid abduction (8.31 N versus 11.48 N for tie-bolt and 11.86 N for controls), suggesting lower physiological loading demands during laryngeal function; however, the tie-bolt construct demonstrated substantially greater stiffness (31.05 versus 18.53 N/mm for anchors), resistance to elongation (2.62 versus 3.87 mm over cyclic loading), and ultimate load tolerance (367 versus 197 N), before failing at the arytenoid cartilage itself rather than through suture cut-through or implant pullout. For clinical practice, these findings suggest that whilst suture anchors may reduce immediate mechanical stress on the laryngeal framework during normal movement, tie-bolt implants offer superior durability and may better withstand the repetitive cyclic forces experienced during athletic performance, potentially extending construct longevity and reducing revision surgery rates in high-demand horses.
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Practical Takeaways
- •Suture anchor implants may be advantageous if minimizing initial abduction force is clinically desirable, though long-term stability data is needed
- •Tie-bolt implants offer superior mechanical durability and resistance to cyclic loading degradation, potentially providing longer-lasting surgical outcomes
- •Choice between implant types should consider both surgical ease (suture anchor advantage) and long-term mechanical stability (tie-bolt advantage) based on individual case requirements
Key Findings
- •Suture anchor constructs required significantly less force to achieve 88% arytenoid abduction (8.31 N) compared to tie-bolt (11.48 N) and suture-alone controls (11.86 N)
- •Tie-bolt implants demonstrated superior stiffness (31.05 N/mm) compared to controls (23.48 N/mm) and suture anchors (18.53 N/mm), with less elongation under cyclic loading
- •Tie-bolt constructs failed at substantially higher ultimate loads (367.25 N) than suture anchors (196.55 N) and controls (238.14 N), suggesting improved long-term durability
- •Failure modes differed by construct type: suture cut-through (control), implant pullout (suture anchor), and arytenoid fracture (tie-bolt)