Treatment of a comminuted frontal-plane fracture of the distal phalanx in a horse.
Authors: Anderson, Turner, Kobluk
Journal: Journal of the American Veterinary Medical Association
Summary
# Editorial Summary A case study from 1997 describes successful management of a comminuted distal phalanx fracture running through the solar canal near the deep digital flexor tendon insertion—a notoriously challenging injury type due to the competing biomechanical demands on this region. Anderson and colleagues treated the fracture using a hoof cast to minimise bending and tensile stresses across the solar surface during weightbearing, combined with 3-degree wedge pads to elevate the heel and reduce distraction forces from the deep digital flexor tendon pull; two casts were applied over a 4-month healing period. Radiographic union was complete at 4 months, though clinical lameness persisted at that stage; however, the horse achieved functional soundness by 7 months post-injury and remained clinically normal with no detectable lameness at 12-month follow-up. For practitioners managing distal phalanx fractures, this case highlights the value of biomechanical modification through hoof casting and heel elevation in addressing the specific anatomy and mechanical forces at play, whilst underscoring that radiographic healing does not always correlate with immediate functional recovery. The extended recovery timeline and delayed resolution of lameness suggest patience with conservative management and ongoing load modification may be warranted even when fracture consolidation appears complete.
Read the full abstract on PubMed
Practical Takeaways
- •Hoof casting combined with heel wedging is effective for managing distal phalanx fractures by controlling hoof expansion and reducing tendon-mediated distraction forces
- •Elevation of the heel (3 degrees) specifically addresses deep digital flexor tendon pull, a critical mechanical factor in distal phalanx fracture healing
- •Expect 4-month radiographic healing with functional soundness by 7 months using this protocol—plan extended convalescence and serial cast changes accordingly
Key Findings
- •Comminuted distal phalanx fracture healed completely within 4 months using hoof cast immobilization and heel elevation
- •3-degree wedge pads reduced distraction stress from deep digital flexor tendon pull at fracture site
- •Horse achieved clinical soundness by 7 months post-injury with normal foot examination at 12 months