Decision-tree analysis of clinical data to aid diagnostic reasoning for equine laminitis: a cross-sectional study.
Authors: Wylie C E, Shaw D J, Verheyen K L P, Newton J R
Journal: The Veterinary record
Summary
# Editorial Summary Wylie et al. (2016) conducted a cross-sectional analysis of clinical data from 588 laminitis cases and 201 lame controls to establish which physical signs most reliably distinguish laminitis from other causes of lameness in equine practice. Using logistic regression and decision-tree modelling, the researchers identified five clinical signs with substantially elevated prevalence in laminitis cases: reluctance to walk, short stilted gait, difficulty turning, weight-shifting behaviour, and increased digital pulse—all showing odds ratios between 4.4 and 17.7. Most strikingly, bilateral forelimb lameness emerged as the single strongest discriminator, present in 92% of laminitis cases (OR 40.5); when combined with an increased digital pulse, diagnostic certainty reached 99%, whilst a flattened or convex sole further improved discrimination accuracy (OR 15.5). This novel application of decision-tree analysis provides the first robust evidence base for differential diagnosis of laminitis in first-opinion practice, moving beyond anecdotal assessment toward systematic evaluation of clinical indicators. For farriers, physiotherapists and vets in the field, these findings underscore the diagnostic value of recognising bilateral forelimb involvement and digital pulse changes as sentinel signs, potentially enabling earlier intervention and improved welfare outcomes.
Read the full abstract on PubMed
Practical Takeaways
- •Use bilateral forelimb lameness combined with increased digital pulse as a highly reliable diagnostic indicator for laminitis in clinical practice
- •Assess for difficulty turning, weight-shifting behavior, and short stilted gait as key discriminatory signs to differentiate laminitis from other causes of lameness
- •Include sole conformation assessment as part of laminitis diagnosis; flat or convex soles significantly support laminitis diagnosis
Key Findings
- •Bilateral forelimb lameness was the strongest single discriminator for laminitis, with 92% of affected animals having laminitis (OR 40.5, P<0.001)
- •When bilateral forelimb lameness was combined with increased digital pulse, 99% of animals were identified as laminitic
- •Five clinical signs showed >50% prevalence difference between laminitis and control groups: reluctance to walk (OR 4.4), short stilted gait (OR 9.4), difficulty turning (OR 16.9), shifting weight (OR 17.7), and increased digital pulse (OR 13.2)
- •Flat/convex sole significantly enhanced diagnostic discrimination for laminitis (OR 15.5, P<0.001)