Cervical articular process joint osteochondrosis in Warmblood foals.
Authors: Bergmann Wilhelmina, de Mik-van Mourik Marjolijn, Veraa Stefanie, van den Broek Jan, Wijnberg Inge D, Back Willem, Gröne Andrea
Journal: Equine veterinary journal
Summary
# Cervical Articular Process Joint Osteochondrosis in Warmblood Foals Osteochondrosis of the articular process joints (APJ) represents a significant developmental concern in Warmblood foals, yet its relationship to cervical vertebral malformation (CVM)—a condition already associated with poor prognosis—remains poorly understood. Researchers examined 700 APJ facets from C2 to T2 vertebrae in 29 foals (median age 7 days; range 365 days) to determine whether osteochondrotic lesions showed predilection sites that might correlate with known CVM locations. Approximately one-fifth of facets demonstrated osteochondrosis, with prevalence declining significantly by 12 months of age (OR 0.997) even as lesion severity paradoxically increased across all age groups, particularly within the first month (OR 1.114). Highest prevalence occurred in cranial facets of cervical and cervicothoracic joints and caudal facets of thoracic joints, distributions that did not overlap with established CVM predilection sites—a crucial finding suggesting that enchondral ossification abnormalities are unlikely to be primary drivers of CVM development. For equine practitioners, this work implies that APJ osteochondrosis in young foals may represent a self-limiting developmental process distinct from the structural malformations defining CVM, potentially reducing concern about early articular process involvement as an indicator of progressive cervical disease.
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Practical Takeaways
- •APJ osteochondrosis is common in young Warmblood foals but does not correlate with CVM predilection sites, suggesting different pathogenic mechanisms
- •Severity of lesions increases with age while prevalence decreases, indicating some spontaneous resolution or remodeling occurs during the first year of life
- •Breeders should recognize that APJ osteochondrosis in foals may not be a direct precursor to clinically significant cervical problems, warranting further investigation of CVM etiology
Key Findings
- •20.6% of cervical and cranial thoracic articular process joint facets showed osteochondrosis in Warmblood foals
- •Osteochondrosis prevalence decreased with age up to 1 year (OR 0.997) but severity increased across all age ranges
- •No predilection site for osteochondrosis was found, contrasting with known CVM predilection sites
- •Findings suggest enchondral ossification abnormalities may not be major contributors to cervical vertebral malformation in Warmblood horses