Voluntary limb-load distribution in horses with acute and chronic laminitis.
Authors: Hood, Wagner, Taylor, Brumbaugh, Chaffin
Journal: American journal of veterinary research
Summary
# Editorial Summary: Voluntary Limb-Load Distribution in Acute and Chronic Laminitis Hood and colleagues examined how horses redistribute weight between their limbs when experiencing laminitis, using a custom force-measurement system to quantify both mean limb load and load distribution profile (a measure of how frequently horses shift weight) across 10 acutely laminitic, 20 chronically laminitic, and 20 control horses. Healthy horses bearing approximately 58% of body weight on their forelimbs displayed symmetrical left-right loading and greater weight-shifting activity in the forelimbs compared to hindlimbs, with head and neck movement influencing this pattern. Chronic laminitis produced distinctly abnormal loading: preferential loading of one forelimb, reduced total forelimb load, and markedly increased load redistribution that correlated with lameness severity; conversely, acutely laminitic horses showed no change in overall load distribution immediately after onset but displayed significantly *reduced* weight-shifting frequency. These findings suggest that load distribution profiling offers diagnostic potential—detecting acute laminitis through decreased weight-shifting behaviour, quantifying chronic lameness severity, and monitoring rehabilitation progress—though the distinction between acute and chronic presentations warrants careful clinical interpretation when using this approach for screening or assessment.
Read the full abstract on PubMed
Practical Takeaways
- •Load distribution profiling may offer an objective method to screen for and grade laminitis severity earlier than visual lameness assessment alone
- •Chronic laminitis develops compensatory loading patterns (preferential foreleg loading with reduced overall forelimb load) that correlate with worsening; monitoring this pattern helps track disease progression
- •Acute laminitis presents differently—paradoxically with reduced voluntary load shifting rather than altered weight percentages—so assessment must distinguish between acute and chronic presentations
Key Findings
- •Control horses distributed 58% of body weight to forelimbs and 42% to hind limbs with equal left-right distribution
- •Chronic laminitis horses showed increased preferential loading of one forelimb, decreased total forelimb load, and increased load distribution variability correlated with lameness severity
- •Acute laminitis horses showed no change in mean limb loads after lameness onset but significantly decreased load distribution profile (less frequent load shifting)
- •Load distribution profile appears more sensitive than mean load percentage for detecting acute laminitis and monitoring chronic laminitis severity