Equine Hernias Study Guide

Overview and Clinical Importance

Hernias represent a significant category of equine surgical conditions encountered in both foals and adult horses. A hernia is defined as the protrusion of an organ or tissue through an abnormal opening in the body wall. In equine practice, the three most clinically relevant types are umbilical hernias (congenital or acquired), post-operative celiotomy hernias (incisional hernias following abdominal surgery), and muscle hernias (traumatic abdominal wall defects). Understanding the pathophysiology, diagnosis, and treatment options for each type is essential for the NAVLE examination.

These conditions range from benign self-resolving defects to life-threatening emergencies requiring immediate surgical intervention. The ability to differentiate between reducible and incarcerated hernias, recognize strangulation, and understand breed predispositions is critical for clinical decision-making.

Key Definitions and Terminology

Section 1: Umbilical Hernia

Etiology and Pathophysiology

Umbilical hernias are the most common congenital defect in horses, occurring in approximately 0.5-2% of foals, with some studies reporting incidence as high as 4.8% in Thoroughbreds. They develop when the abdominal wall fails to close properly at the umbilical ring after birth.