Necrosis of the collateral cartilage of the distal phalanx in horses: 16 cases (1970-1985).
Authors: Honnas, Ragle, Meagher
Journal: Journal of the American Veterinary Medical Association
Summary
# Editorial Summary: Collateral Cartilage Necrosis in Horses Necrosis of the collateral cartilage of the distal phalanx typically develops following puncture or laceration wounds to the heel bulb region, manifesting as persistent drainage proximal to the coronary band and lameness that can persist for months if left untreated. This retrospective review of 16 cases (predominantly affecting the lateral cartilages of the front feet) compared surgical management via curettage or resection against conservative treatment, with 15 horses followed for 2 to 72 months post-discharge. Two-thirds of horses achieved soundness and returned to their previous level of work; however, prognosis was significantly influenced by treatment timing—those presenting within one month of injury onset had substantially better outcomes than those with longer drainage duration, and one horse developed septic arthritis of the distal interphalangeal joint, requiring euthanasia. Surgically managed cases (9 of 13 sound at follow-up) performed marginally better than conservatively treated cases (1 of 3 sound), suggesting early intervention with cartilage removal offers superior functional recovery. For practitioners, this underscores the importance of prompt recognition and aggressive treatment of puncture wounds to the plantar/palmar heel region; delayed intervention significantly compromises long-term soundness, even with eventual surgical management.
Read the full abstract on PubMed
Practical Takeaways
- •Early intervention within 1 month of drainage onset significantly improves prognosis; delayed treatment substantially reduces chance of return to soundness
- •Surgical management (curettage or resection) yields better outcomes than conservative treatment for collateral cartilage necrosis
- •Drain wounds over the collateral cartilages of the distal phalanx should be treated urgently to prevent progression to septic arthritis and permanent lameness
Key Findings
- •66% of 15 horses with follow-up were sound and able to perform at previous level (2-72 months post-discharge)
- •Horses with drainage lasting less than 1 month prior to treatment had better prognosis for soundness than those with drainage ≥1 month
- •9 of 13 surgically managed horses (69%) were sound at follow-up compared to 1 of 3 conservatively managed horses (33%)
- •Right front lateral cartilage was most frequently affected (n=5), followed by right rear lateral (n=4) and left front lateral (n=4)