Description and Complications of a New Modified Semi-Closed Castration Technique in Horses.

Overview

• This study presents a new modified semi-closed castration technique for horses and other equids that reduces common postoperative complications and enhances recovery.
• The method allows direct inspection during surgery while minimizing risks, resulting in low complication rates and quicker return to normal activity.

Background

• Castration is a frequently performed surgical procedure in equids (horses, ponies, donkeys).
• Common postoperative complications include hemorrhage (bleeding), infection, scrotal swelling, and eventration (protrusion of abdominal contents), which negatively affect recovery and surgical success.
• Existing castration techniques are generally classified based on how the vaginal tunic (a membrane surrounding the testes) is handled: fully open, semi-closed, or closed methods.
• There has been inconsistency in defining these classifications, particularly concerning the state of the vaginal tunic after surgery.

Purpose of the Study

• To introduce and describe a novel modified semi-closed castration technique targeting improvement in safety and reduction of complications.
• To evaluate the complication rates and postoperative recovery outcomes of this technique in a large sample of equids.
• To propose refined definitions for castration technique classifications focusing on the vaginal tunic status post-procedure for improved clarity.

Methodology

• Retrospective study involving 85 sexually intact mature male equids, including horses, ponies, and donkeys.
• All patients underwent the new semi-closed inguinal castration procedure under general anesthesia.
• The technique involved:
  • Carefully managing the opening of the parietal vaginal tunic to allow direct visualization and inspection of its contents (testes, spermatic cord structures).
  • Subsequent secure closure of the vaginal tunic to combine the inspection benefits of open methods with the protective advantages of closed methods.
• Surgical duration was monitored, and intraoperative and postoperative complications were recorded.
• Follow-up was conducted using owner interviews at least three months post-surgery to assess healing, recovery time, and return to normal activity.

Findings and Results

• The median surgery duration was 60 minutes, with a range from 45 to 95 minutes.
• No intraoperative complications (such as excessive bleeding or surgical errors) were observed.
• Postoperative complications were minimal:
  • Only 2 out of 85 equids (2.35%) experienced scrotal swelling, which resolved quickly with non-steroidal anti-inflammatory drugs (NSAIDs).
  • No cases of postoperative hemorrhage, fever (pyrexia), or infection were reported.
• All equids healed primarily by intention (clean wound closure without secondary healing) with complete and satisfactory recovery.
• Patients returned to normal activity within two days after surgery, demonstrating rapid recovery.
• When compared to previously published complication rates ranging from 2% to 48%, this new technique showed superior outcomes.

Significance and Contributions

• The study provides a detailed description of a novel semi-closed castration approach that:
  • Marries the advantage of direct visualization of anatomical structures (usually afforded by open methods) with the increased safety of closed techniques.
  • Minimizes common risks such as hemorrhage and infection.
  • Ensures a faster return to normal activity, enhancing animal welfare.
• Proposes a refinement to traditional classification systems for castration methods:
  • Suggests greater emphasis on the status of the vaginal tunic post-surgery—open, semi-closed, or closed—as this influences both technique and outcomes.
  • This may improve consistency of terminology and facilitate clearer communication among veterinary surgeons.
• The technique may become a preferred method for equine castrations in clinical practice due to its efficiency and improved safety profile.

Overall Conclusion

• The new modified semi-closed inguinal castration technique in equids offers an effective balance between inspection capability and safety.
• It significantly reduces postoperative complications like swelling, hemorrhage, and infection compared to traditional methods.
• The procedure is associated with rapid healing and early resumption of normal activity.
• This approach, combined with clearer classification based on vaginal tunic management, can improve surgical standards and postoperative outcomes in equine castration.