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Pathology or Adaptation? Deciphering Advanced Imaging and Hoof Morphometrics in the Performance Horse

ByDr Olivia James Posted on

As a “Road Warrior” in equine practice, few things are as challenging as a high-level showjumper with a “grade 1” lameness and a set of radiographs that look… mostly normal.

With the increasing accessibility of standing MRI and CT, we are seeing more than ever before – but are we over-diagnosing?

Recent landmark studies from Nagy and Dyson (2024) and new research into hoof morphometrics are providing the baseline data we need to differentiate between the healthy athlete and the horse on the verge of a breakdown.

1. The Fetlock “Grey Area”: Adaptive vs. Pathological

A groundbreaking 2024 study by Nagy and Dyson examined 31 Warmblood showjumpers in full work and competing regularly – all of whom were clinically sound. The results from low-field MRI and CT were a revelation for clinical decision-making:

  • Densification is Normal: In 85.5% of limbs, imaging showed densification (sclerosis) in the sagittal ridge and metacarpal condyles.
  • The Insight: This densification likely reflects adaptive remodeling to exercise rather than active disease. However, when CT detects subchondral bone resorption alongside this densification, it may signal an early stage of disease that radiographs simply cannot catch.

2. Predicting Risk: The CBC and DHWA Formula

Can we predict lameness before it happens using a tape measure and a smartphone? 2024 research in Animals suggests we can. By analyzing 73 adult horses, researchers identified specific “high-risk” hoof conformations:

  • The Upright Foot: A small Coronet Band Circumference (CBC) paired with a large Dorsal Hoof Wall Angle (DHWA) (steep angle) significantly increases the probability of lameness due to higher concussive forces.
  • The Broken-Back Axis: Conversely, a large CBC with a small DHWA (low angle) indicates a broken-back hoof-pastern axis, placing excessive strain on the suspensory apparatus.
  • The Clinical Takeaway: Monitoring these measurements allows for “proactive podiatry,” adjusting trimming intervals before subclinical strain becomes a career-ending injury.

3. MRI vs. CT: Which Tool for Which Case?

2025 comparative studies emphasize that while MRI is superior for detecting bone marrow oedema-like signals and soft tissue injuries, CT offers unmatched precision for identifying subchondral bone plate lesions and fissures in the proximal phalanx.

For the ambulatory vet, knowing when to refer for which modality is the key to a fast, accurate diagnosis.

Bridge the Gap to Hands-On Mastery

Differentiating subtle imaging changes from true pathology is a skill honed through hundreds of cases. The Lameness Program provides the clinical mentorship to help you interpret these findings with confidence.

Practitioner’s Program Member Call to Action: Log in now to watch these diagnostic imaging modules if you are a member of the platform and dont have access to the Lameness Program:

  • Radiology of the Fetlock and Pastern: Mastering the standard views and identifying subtle “grey zone” changes.
  • How to Take Perfect Podiatry Radiographs: A step-by-step guide to the views that matter for the farrier.
  • Practical Approach: When to Refer for Advanced Imaging: Identifying which cases need MRI, CT, or Scintigraphy to move forward.
Access free CE learning designed for equine veterinarians

References:

  • Nagy A, Dyson S. (2024). MRI, CT and Radiographic Findings in the MCP Joints of 31 Non-Lame Showjumpers. Animals.
  • Mata F, et al. (2024). Investigating Associations between Horse Hoof Conformation and Presence of Lameness. Animals.
  • Vandersmissen M, et al. (2025). Comparison of cone beam CT and low-field MRI for diagnosing equine foot and pastern lesions. Equine Veterinary Education.
  • Practitioner’s Program 2026 Annual. The Equine Practice Company.

Dr. Olivia James is the founder and CEO of The Equine Practice Company, that specializes in delivering accessible, practical education for equine veterinarians worldwide.

With a career spanning from mixed practice in rural Australia to equine dentistry, Dr. James combines firsthand experience with a passion for advancing veterinary care. Inspired by a volunteer mission in Indonesia, she created a platform to meet the global need for real-world, on-demand learning.

Dedicated to empowering equine vets, Dr. James provides tools and knowledge to improve patient outcomes and support veterinarians, all driven by her enduring love for the horse and the profession.

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