Radiographic retrospective study of the caudal cervical articular process joints in the horse.
Authors: Down S S, Henson F M D
Journal: Equine veterinary journal
Summary
# Editorial Summary: Caudal Cervical Articular Process Joint Enlargement in Horses Degenerative changes at the caudal cervical articular process joints (APJs), particularly at C5-C6 and C6-C7, are recognised as a significant source of ataxia and paresis in horses due to spinal cord compression, yet little is known about the factors predisposing to their enlargement beyond age. Down and Henson's 2009 retrospective radiographic analysis examined whether breed, age, sex, and work history influenced the degree of APJ enlargement and whether this correlated with observed neurological deficits. The findings revealed important associations between certain variables and joint enlargement, though the relationship between radiographic changes and clinical presentation proved more nuanced than initially hypothesised. Understanding these associations helps practitioners identify at-risk populations and interpret imaging findings more accurately, whilst the lack of direct correlation between enlargement severity and neurological signs suggests that factors such as joint inflammation, individual variation in spinal canal diameter, and lesion location may be equally important in determining clinical outcome. These insights should inform both diagnostic interpretation and prognostic counselling when cervical APJ disease is identified on radiographs.
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Practical Takeaways
- •Caudal cervical articular process joint disease should be considered in the differential diagnosis for horses presenting with ataxia and paresis, particularly older animals
- •Radiographic evaluation of the C5-C6 and C6-C7 joints may help identify articular process enlargement that could explain neurological signs
- •Age-related changes in cervical articular process joints appear to be a normal finding; the clinical significance of enlargement relative to neurological signs requires further investigation
Key Findings
- •Arthropathy of caudal cervical articular process joints is documented as a cause of ataxia and paresis secondary to spinal cord compression in horses
- •Enlargement of caudal articular process joints increases with age
- •Study investigated associations between cervical APJ enlargement at C5-C6 and C6-C7 articulations and case subject details including breed, age, sex, and usage