Is there an association between clinical features, response to diagnostic analgesia and radiological findings in horses with a magnetic resonance imaging diagnosis of navicular disease or other injuries of the podotrochlear apparatus?

The study investigates the association between clinical features, response to diagnostic analgesia, and radiological findings in horses diagnosed with navicular disease or other podotrochlear apparatus injuries. The research found inconclusive evidence that certain clinical examinations can definitively differentiate these diseases, and that magnetic resonance imaging (MRI) remains key for accurate diagnosis.

Study Objective and Hypothesis

• The study aimed to analyze and compare the clinical features of horses diagnosed with different kinds of foot pain, focusing on lesions of the podotrochlear apparatus and other foot pain causes.
• The researchers hypothesized that primary navicular bone disease would exhibit more serious radiological results than other foot pain diagnoses.

Study Design and Methodology

• The research was retrospective, analyzing previous examinations of horses diagnosed with foot pain based on MRI or post-mortem analysis at a referral center.
• The study divided the horses into five diagnostic groups: primary navicular bone pathology (NB), lesions of the collateral sesamoidean ligament and/or distal sesamoidean impar ligament (CSL + DSIL), primary deep digital flexor tendon injury (DDFT), navicular bone pathology and other podotrochlear apparatus lesions ± DDFT (PTA), and Other.
• The comparison was made based on multiple factors: clinical examination findings, response to diagnostic analgesia, and radiological grading of the navicular bone.

Research Findings

• The group that had navicular bone pathology and other podotrochlear apparatus lesions was more likely to be unilaterally lame than other groups.
• Horses with a primary injury to the deep digital flexor tendon were more likely to show pain when turning than the rest of the groups.
• There was no observed significant connection between the response to diagnostic analgesia and the diagnostic group.
• Likewise, there was no significant connection between the radiological grade and the diagnostic group.
• From the clinical examinations, generally, diseases of the PTA could not be distinctly separated from other causes of foot pain.
• Overall radiological scores of the navicular bone were not successful in predicting precisely the pathology of the navicular bone.

Conclusion

• While initial examinations and radiological grading may provide some insight into foot pain causes, they are not definitively indicative of specific conditions, such as navicular bone disease or other podotrochlear apparatus injuries.
• The use of MRI continues to be a crucial tool for accurately diagnosing these conditions, supporting its continued use in equine medicine.