NAVLE Musculoskeletal

Equine Laminitis Study Guide

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...

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.

High-YieldLaminitis is the second biggest killer of domestic horses. Over 90% of laminitis cases are now attributed to endocrinopathic causes (EMS, PPID), making metabolic evaluation essential in any laminitis case.
Type Etiology/Examples Pathophysiology
Endocrinopathic (greater than 90%) Equine Metabolic Syndrome (EMS) Pituitary Pars Intermedia Dysfunction (PPID/Cushing's) Pasture-associated (spring grass) Corticosteroid administration Hyperinsulinemia causes epidermal cell proliferation, secondary lamellae lengthening, and basement membrane disruption
Sepsis/SIRS-Related Grain overload Retained placenta/metritis Enterocolitis, pleuropneumonia Black walnut shavings exposure Circulating inflammatory mediators cause leukocyte activation, endothelial damage, MMP activation, and basement membrane degradation
Support Limb (Contralateral) Severe unilateral lameness Fracture of contralateral limb Septic arthritis Excessive continuous weight-bearing causes ischemia from inadequate cyclic loading/unloading and decreased laminar perfusion
Mechanical/Traumatic Road founder (hard surfaces) Long toes/poor hoof balance Excessive concussion Direct physical damage to laminae from excessive mechanical stress

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.

You've been studying hard

Create a free account to keep reading

Free accounts get 5 articles/day + daily practice question

Join 14,000+ vet students already studying with NavleExam.

No credit card needed — free account takes 30 seconds.

Create Free Account — Keep Reading Already have an account? Log in
or skip signup — just get daily questions

No spam. One question per day. Unsubscribe anytime.

NAVLE Exam Prep Platform

Everything you need to pass the NAVLE

10,000+ Practice Questions
Exam-style with full explanations
Past Exam Papers
Real previous exam questions
Flashcard Mode
Species & topic quick review
High-Yield Study Guides
What's actually on the exam
Start Free Trial → See Plans & Pricing No credit card required to start