Clinical, radiological and ultrasonographic features, treatment and outcome in 22 horses with caudal distal radial osteochondromata.

This study focuses on osteochondromata in the caudal distal radius of horses, specifically thoroughbreds, and how it affects their deep digital flexor tendon. The researchers reviewed recorded cases, observed the effect of treatment methods, and found that removing the osteochondroma and debridement of the tendon led to positive outcomes.

Research Purpose and Overview

• The main goal of this research was to study osteochondromata, bone growths, that occur in the caudal distal radius (the lower part of the large foreleg bone) in horses, particularly in young thoroughbreds. There has been scarce information regarding similar studies in literature, especially about the associated damage to the deep digital flexor tendon caused by such growths.

Methods Employed

• The research team carried out a retrospective review of case records and diagnostic images of horses diagnosed with osteochondromata in the caudal distal radius.
• The information obtained was used to study the frequency of occurrence, the size and location of the growths, and the associated damage to the adjacent deep digital flexor tendon, a vital muscle component in a horse’s leg.

Findings and Interpretations

• The researchers identified osteochondromata in 22 horses, of which 19 were Thoroughbreds. In total, 25 osteochondromata were found across these 22 horses.
• All osteochondromata were metaphyseal, meaning they were located in the part of the bone where growth occurs. Additionally, 22 out of the 25 identified growths were in the middle one-third of the radius. This is significant as it is in this location that they are likely to cause damage to the deep digital flexor tendon.
• Treatment in all cases involved the removal of the osteochondroma and cleaning up (debridement) of the deep digital flexor tendon when affected. After the treatment, all horses returned to work and none showed any evidence of recurrence, indicating favourable treatment outcomes.

Conclusions and Prognosis

• The research concluded that osteochondromata of the caudal distal radius are of significant concern in young racing Thoroughbreds as they are a leading cause of inflammation of the carpal sheath of the digital flexor tendons (tenosynovitis).
• The study establishes the need for attention to these growths, particularly when they are in the middle third of the bone, as they can cause significant impingement damage to the deep digital flexor tendon.
• The findings also suggest that treatment involving the removal of the osteochondroma and debridement of the tendon gives horses a good prognosis, making it a recommended method of management for these cases.