Equine Laminitis Study Guide

Overview and Clinical Importance

Laminitis is an extremely painful, potentially life-threatening disease involving inflammation and structural failure of the laminae (lamellae), the interdigitating tissue structures that suspend the distal phalanx (coffin bone, P3) within the hoof capsule. It represents one of the most common causes of lameness-related euthanasia in horses and is consistently tested on the NAVLE. The disease affects horses, ponies, and donkeys of all breeds, with certain populations at significantly higher risk.

The term "founder" refers specifically to the chronic mechanical changes and displacement of P3 that occur as a consequence of laminar failure, not the acute inflammatory phase itself. Understanding this distinction is essential for exam success.

Anatomy of the Laminar Junction

The laminar junction is the critical interface that suspends P3 within the hoof capsule. Understanding this anatomy is fundamental to comprehending laminitis pathophysiology.