An ex vivo biomechanical comparison of two suture materials and two pattern combinations for equine superficial digital flexor tendon tenorrhaphy.
Authors: Giacchi Andrea, McMaster Mattie A
Journal: Veterinary surgery : VS
Summary
# Editorial Summary: Suture Materials and Patterns for Equine SDFT Repair Superficial digital flexor tendon (SDFT) injuries remain a significant challenge in equine practice, with healing quality fundamentally dependent on suture technique and material choice during primary repair. Giacchi and McMaster conducted an ex vivo biomechanical analysis comparing two established repair patterns—the three-loop pulley (3LP) and Bunnell technique (BT)—combined with two different suture materials: polydioxanone (PDS) and polyester tape, using cadaverous equine SDFTs to assess tensile strength, stiffness, and failure modes under controlled conditions. The Bunnell technique with polyester tape demonstrated superior biomechanical performance compared with PDS alone, whilst the 3LP pattern with PDS proved less effective, suggesting that material choice significantly influences repair integrity independent of pattern geometry. These findings have direct clinical implications for surgical planning: practitioners selecting repair techniques should prioritise polyester tape augmentation where feasible, as improved initial tensile strength may reduce re-rupture risk during the critical early remodelling phase and potentially improve long-term functional outcomes in returning horses to work.
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Practical Takeaways
- •Consider three-loop pulley or Bunnell with polyester tape reinforcement when performing equine SDFT tenorrhaphy, as these combinations provide superior strength during early healing when re-injury risk is highest
- •Polyester tape augmentation is a practical method to improve repair strength without switching to more complex repair patterns
- •Suture material choice matters—ensure your selected technique and material combination has been biomechanically validated for the repair location and expected loading
Key Findings
- •Three-loop pulley (3LP) pattern with PDS suture demonstrated superior biomechanical strength compared to Bunnell technique (BT) with PDS
- •Polyester tape (PT) reinforcement of Bunnell technique improved load-to-failure characteristics compared to PDS alone
- •Bunnell technique with polyester tape showed comparable biomechanical performance to three-loop pulley with PDS
- •Suture material and repair pattern both significantly influence tenorrhaphy strength in equine SDFT repairs