Ex vivo comparison of the giant and transfixing knot in equine open and closed castration.

This study investigates the effectiveness of using different knot techniques on a horse’s testicles during castration. It found that the hole left by the giant and transfixing knots is similar in size, but the giant knot requires less suture material.

Research Objective

• The purpose of this study was to compare the modified giant and transfixing knots and the emasculator in open and closed equine castration techniques.

Methods

• 144 testicles were split into two groups: those used for open castration and those for closed castration.
• The groups were further divided to compare multiple techniques: an emasculator only, an emasculator plus a giant knot, and an emasculator plus a transfixing knot.
• The open castration group also analyzed the effects of the giant knot and transfixing knot by themselves.
• The researchers measured the length of suture material needed for each knot and the leaking pressure of the testicular artery using dye injection. For the closed castration group, they evaluated the strength of the parietal tunic with a tensiometer.

Key Findings

• The study found that open castration resulted in higher leaking pressure than closed castration. However, there wasn’t a significant difference between subgroups.
• Minimum leaking pressure for the emasculator plus transfixing knot and emasculator-only subgroups was near standard physiological arterial pressures.
• The giant knot used less suture material than the transfixing knot.
• The tensile strength of the tunic was greater when ligatures were used.

Conclusions

• The giant and transfixing knot techniques have comparable haemostatic capability and parietal tunic tensile strength, but the giant knot uses less suture material.
• In open castration, using just the emasculator could provide suitable haemostasis.
• For closed castration, using the giant knot with the emasculator increased the bursting pressure, potentially reducing the likelihood of haemorrhage.
• Applying a ligature ring in closed castration could reduce the risk of evisceration.