A Case Series of Five Horses with Superficial Digital Flexor Tendon Lesions in the Carpal Canal.

The research article delves into the study of superficial digital flexor tendon (SDFT) lesions within the carpal canal in five horses aged between 11-28 years old. Each horse exhibited a severe limp in one front leg, which became worse when the proximal limb was flexed, with mild swelling in the palmar carpal region.

Clinical Presentation

In the article, the experiential notable behaviors observed in the affected horses include:

• Acute, unilateral forelimb lameness
• Exacerbation of lameness post proximal limb flexion
• Mild swelling of the palmar carpal region in the majority of cases

Diagnostic Measures

The diagnoses of the lesions were achieved using a range of techniques:

• The use of anesthesia on the ulnar nerve helped cease the lameness
• Ultrasound evaluation revealed an enlarged cross-sectional area of the superficial digital flexor tendon. Compared to the healthy limb, the affected tendon’s enlarged area was apparent
• Ultrasound images also revealed a loss of tendon fiber structure, which was most noticeable on longitudinal scans

Treatment and Outcome

The results of the treatments varied amongst the horses:

• Three out of the five horses regained their previous level of performance post-treatment
• Two horses had to be euthanized due to the severity of their condition
• Findings suggested that a “back at the knee carpal” region conformation was linked to a worse prognosis in these cases
• A post-mortem analysis on one of the horses found an intratendinous fibroma within the tendon

Hence, the research emphasizes the importance of early diagnosis and treatment to potentially save the horse and improve its quality of life. Further, it also indicates a need for more extensive research in preventing and effectively treating this condition due to the severity of its progression and potential fatality.