Bilateral degenerative suspensory desmitis with acute rupture in a Standardbred colt
Authors: Miller K. D., Juzwiak J. S.
Journal: Equine Veterinary Education
Summary
# Editorial Summary A three-month-old Standardbred colt presented with acute bilateral hindlimb swelling and lameness, prompting investigation into a rare and clinically significant condition affecting the suspensory apparatus. Clinical examination revealed elevated muscle enzymes (AST, ALT, LDH and CK) alongside radiographic evidence of distally displaced proximal sesamoid bones and pastern joint subluxation in both hindlimbs, whilst ultrasonography demonstrated large, diffuse hypoechoic lesions throughout the bodies of both suspensory ligaments. Histopathological analysis confirmed bilateral degenerative suspensory desmitis with acute rupture—an exceptionally uncommon presentation in a young horse, particularly affecting both limbs concurrently. The case highlights the importance of recognising that degenerative ligamentous pathology can manifest dramatically in very young animals, potentially reflecting either congenital weakness, systemic metabolic factors, or undetected trauma, and demonstrates the diagnostic value of combining imaging modalities with histology when presentation is atypical. For practitioners managing young stock, this case serves as a reminder to investigate bilateral or acute-onset hindlimb lameness thoroughly, as early identification of suspensory ligament compromise may inform prognosis and management decisions during critical growth phases.
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Practical Takeaways
- •Bilateral acute suspensory rupture in a young foal is rare; when suspected, ultrasonography and radiography are essential diagnostic tools to confirm the diagnosis and assess joint involvement
- •Elevated serum muscle enzymes (AST, ALT, LDH, CK) may accompany acute suspensory injury and warrant investigation of the locomotor system
- •Early recognition of suspensory ligament rupture is critical as secondary complications including sesamoid bone displacement and pastern joint subluxation can develop acutely
Key Findings
- •3-month-old Standardbred colt presented with acute bilateral hindlimb swelling and lameness secondary to suspensory ligament rupture
- •Ultrasonography revealed large diffuse hypoechoic areas in both hind suspensory ligament bodies consistent with acute rupture
- •Radiographic findings included distal displacement of proximal sesamoid bones and pastern joint subluxation bilaterally
- •Histology confirmed degenerative suspensory desmitis with acute rupture as the underlying pathology