Prevalence of various radiographic manifestations of osteochondrosis and their correlations between and within joints in Dutch warmblood horses.
Authors: Van Grevenhof E M, Ducro B J, Van Weeren P R, Van Tartwijk J M F M, Van den Belt A J, Bijma P
Journal: Equine veterinary journal
Summary
# Osteochondrosis in Dutch Warmbloods: Prevalence and Joint Correlations Osteochondrosis represents the most significant developmental orthopaedic disorder affecting performance horses, yet the prevalence of its various radiographic manifestations and their inter-relationships remain poorly understood—critical gaps that undermine the validity of genetic selection programmes. Van Grevenhof and colleagues radiographed 811 yearlings from 32 representative stallions, scoring the femoropatellar, tarsocrural, and metacarpophalangeal/metatarsophalangeal joints for osteochondrotic lesions across a detailed grading scale. Whilst individual joints showed reasonable normality rates (60.7% in femoropatellar joints, 68.6% in tarsocrural, 64.6% in metacarpophalangeal/metatarsophalangeal), the prevalence increased substantially when all three joint regions were evaluated together, with only 30.5% of yearlings showing completely normal contours across all sites. Critically, the researchers demonstrated that flattened bone contours and osteochondral fragments behave as statistically distinct lesion types with markedly different correlations between joints, whilst left and right limb counterparts show strong symmetry. For practitioners involved in selection and breeding decisions, these findings underscore the necessity of detailed radiographic scoring protocols and suggest that future genetic work must treat lesion morphology separately rather than as a single trait, ultimately enabling more sophisticated and effective breeding strategies to reduce osteochondrosis incidence.
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Practical Takeaways
- •When radiographically screening yearlings for OC, expect that 7 in 10 will have some lesion detected across all three major joints; use this for realistic client counselling on prevalence
- •Sedation improves lesion detection in the femoropatellar joint specifically, so standardize screening protocols accordingly
- •Flattened bone contours and fragments should be evaluated as separate entities rather than as a single disorder, as they have different heritability patterns and may respond differently to management decisions
Key Findings
- •Only 30.5% of yearlings showed normal radiographic findings across all three joint groups (femoropatellar, tarsocrural, and metacarpophalangeal/metatarsophalangeal), indicating high prevalence of OC manifestations
- •Femoropatellar joint showed the highest lesion prevalence at 39.3% (60.7% normal), with improved detection after sedation
- •High correlation between right and left joints suggests OC manifestations are bilaterally consistent, but flattened bone contours and fragments showed weak correlation indicating they represent different pathological processes
- •Detailed radiographic scoring scales are necessary to accurately characterize OC prevalence and distinguish between different manifestation types for genetic studies