Chronic progressive pododermatitis in the horse.

This research article describes a group of Standardbred trotters with chronic hoof deterioration characterized by horn breakdown, detailing the underlying tissue changes, treatment approach, and recovery timeline.

Nature of the Hoof Defect

• The paper outlines sixteen cases where the primary problem was decomposition of the hoof horn, a degenerative process affecting structural integrity.
• The disease typically begins on the weight-bearing surface of the hoof and progressively extends to underrun the sole and hoof wall, compromising stability and function.

Histopathological Findings

• Tissue analysis revealed several characteristic changes:
  • Marked swelling and vacuolation of the stratum corneum cells.
  • Increased cell proliferation in the stratum germinativum, suggesting an attempt at repair.
  • Monocytic infiltration in the corium, indicating chronic inflammation.

Treatment Approach

• Management involved complete removal of the underrun horn to fully expose the affected tissue and allow healthy growth to resume.
• In more severe cases, horses received a course of penicillin, reflecting concern for secondary bacterial involvement.
• The duration of treatment varied depending on lesion severity, with advanced cases requiring extensive care.

Prognosis and Recovery

• Despite the chronic nature of the condition, the overall prognosis was favorable.
• Even in advanced cases, full recovery was achievable, though some horses required up to one year before they were able to return to racing.