In vitro mechanical testing of an alternate laryngoplasty system (ALPS) for horses.
Authors: Ahern Benjamin J, Boston Raymond C, Parente Eric J
Journal: Veterinary surgery : VS
Summary
# Editorial Summary: In vitro Mechanical Testing of an Alternate Laryngoplasty System (ALPS) for Horses Recurrent laryngeal neuropathy (RLN) remains a significant cause of exercise intolerance in horses, and laryngoplasty—surgical stabilisation of the arytenoid cartilage—is the standard management approach, though conventional suture techniques can deteriorate over time due to material fatigue and cartilage wear. Ahern and colleagues conducted mechanical testing on cadaveric equine larynges (n = 10) to evaluate a novel laryngoplasty system (ALPS) comprising a metallic anchor, two strands of #2 suture, and a metallic button against the traditional single-strand #5 Ethibond technique. The ALPS construct demonstrated superior performance in several critical areas: whilst arytenoid load-to-failure was comparable between systems (ALPS 220.6 N versus Ethibond 206.9 N), the ALPS was significantly stronger at the cricoid attachment point (236.0 N versus 161.5 N, P = 0.013), and notably reduced cumulative distraction under 3600 cycles of repetitive loading (3.43 mm versus 6.29 mm, P = 0.033). These findings suggest the ALPS construct offers improved biomechanical stability and reduced micromotion at the suture-cartilage interface, potentially translating to greater longevity and reduced recurrence rates in clinical practice; however, long-term in vivo validation is needed before drawing firm conclusions about its superiority in maintaining effective arytenoid abduction during the typical post-operative period.
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Practical Takeaways
- •The ALPS system may offer improved durability and reduced motion at the surgical site compared to traditional single-suture laryngoplasty, potentially reducing recurrence of clinical signs
- •Reduced distraction with ALPS could translate to better long-term arytenoid positioning and functional outcomes in RLN cases
- •In vitro findings are promising but clinical trials are needed to confirm whether improved mechanical properties translate to better surgical success rates in living horses
Key Findings
- •ALPS constructs showed significantly greater load-to-failure on cricoid cartilage (236.0 N) compared to traditional Ethibond laryngoplasty (161.5 N, P=0.013)
- •ALPS constructs demonstrated significantly reduced distraction (3.43 mm) versus Ethibond (6.29 mm) during cyclic loading (P=0.033)
- •No significant difference in arytenoid load-to-failure between ALPS (220.6 N) and Ethibond (206.9 N) constructs (P=0.486)
- •ALPS construct exhibited greater stiffness and biomechanical stability under cyclic testing compared to traditional laryngoplasty