Horse Periostitis and Splint Welfare Management

Splint formation from periostitis of the cannon and splint bones causes acute lameness that typically resolves with appropriate management, but requires patient welfare support during the active phase.

Key Facts

Splints are bony growths caused by periosteal inflammation at the interosseous ligament between the cannon and splint bones
Young horses in early training are most commonly affected due to the stress of work on immature bone
The acute phase involves significant lameness, heat, and swelling over the affected area
Rest from work during the active phase allows the periostitis to resolve and the bony growth to stabilize
Most horses return to full work after splint formation is complete and lameness resolves
Splints located under the suspensory ligament or affecting the knee joint carry worse prognosis

Welfare Considerations

Active splint formation causes genuine pain from periosteal inflammation — the periosteum (bone covering) is densely innervated and inflammation here causes significant, constant discomfort. A horse with active splint may show marked lameness that horses in the acute phase often mask partially through stoic behavior but reveal on nerve block or through subtle alterations in posture. Rest from work during the active phase is both welfare-positive and prognostically beneficial — horses who continue in work during active splint formation experience prolonged pain and may develop larger, more problematic growths.

What You Can Do

Seek veterinary evaluation for any young horse showing forelimb lameness with localized heat or swelling over the lower leg
Rest the horse from all ridden or driven work during the active inflammatory phase — this is non-negotiable for both welfare and prognosis
Apply cold therapy (cold hosing or ice packs) to the affected area twice daily during the acute phase
Administer prescribed NSAIDs throughout the active phase to manage pain and reduce inflammation
Return to work very gradually after lameness resolves — confirm soundness at each level before progression
Monitor for any recurrence of heat, swelling, or lameness when returning to work and report promptly