Ringbone, Splints and Windgalls for Vet Rehab Therapists

Ringbone, splints and windgalls are everyday findings in equine rehab practice. Some are benign adaptations; others signal underlying joint or soft-tissue pathology that drives pain and poor performance. This guide distils what they are, how they present, what to watch for, and how to support management and rehab alongside the attending veterinarian and farrier.

 

Equine Ringbone (High and Low)

Ringbone is osteoarthritis affecting either the proximal interphalangeal (PIP/pastern) joint as high ringbone, or the distal interphalangeal (DIP/coffin) joint as low ringbone. Osteophytes may be periarticular (outside joint margins) or articular (within joint margins), with variable impact on comfort and function.

 

High Ringbone (PIP OA)

Joint mechanics: The PIP is a low-motion joint (approximately 8–12° flexion-extension); stabilized by medial & lateral collateral ligaments, dorsal and palmar or plantar structures and the joint capsule.

Presentation: Horses may present with a gradual onset, insidious lameness that shows a shortened cranial stride, a reluctance to extend, potential toe first landing pattern, and an altered limb flight pattern such as dishing. A characteristic firm bony thickening around the pastern joint can be palpated. Bony changes can occur on the dorsal, medial or lateral surfaces of the joint, or circumferentially.

Differentials: PIP collateral desmitis, subchondral bone injury, distal suspensory branch strain, long pastern fractures, hoof imbalance pain.

Diagnostics (vet-led): Intra-articular PIP peri-neural blocks to localize; radiographs for osteophytes, joint space change, or subchondral sclerosis; ultrasound for collateral ligaments; CT if needed.

 

Management

• Veterinary/medical: NSAIDs and intra-articular interventions may be indicated.
• Farriery: Balance foot; aim for earlier breakover without over-shortening toe; maintain heel support; avoid excessive wedge use unless directed.
• Rehab & load: Modalities to address OA related pain are appropriate together with progressive loading exercise and postural corrective work.
• Surfaces: Consistent firm surfaces are ideal; avoid both deep and hard surfaces.
• Surgery: PIP arthrodesis is an option when refractory pain is present; prognosis can be good for return to low or moderate impact work when fused.
• Return-to-work markers: Heel-first landing restored, stable lameness score at trot, minimal post-work effusion/heat, tolerance of small circles and gentle lateral work.

Owner message: Many horses are rideable with thoughtful shoeing and measured work; keep footing consistent and training incremental.

 

Low Ringbone (DIP OA)

Joint mechanics: The DIP or coffin joint is a low-motion joint (approximately 5–8° flexion-extension) allowing slight mediolateral movement that allows navigation of uneven terrain. The joint is stabilized by DIP collateral ligaments, collateral sesamoidean (navicular) ligaments, and the joint capsule.

Common comorbidities: Low ringbone can co-exist with navicular apparatus disease, DIP collateral desmitis, and DDFT lesions within the hoof capsule.

Presentation: Horses may present with a bilateral low grade, chronic forelimb lameness, a shortened stride, toe first landing pattern, and a worsening of the lameness on a circle, as well as worsening on hard, soft or uneven terrain. Low ringbone may be palpable on the cranial aspect above the coronary band in severe cases as firm bony thickening, but not in all cases.

Differentials: Primary hoof capsule pain (heels), navicular bone pathology, DDFT tears, collateral ligament desmitis, sole bruising.

Diagnostics (vet-led): Distal limb, peri-neural & intra-articular anesthesia; radiographs; ultrasound of DIP collaterals; MRI or CT when soft-tissue or navicular involvement is suspected.

 

Management

• Veterinary/medical: NSAIDs and intra-articular interventions may be indicated; address concurrent navicular or soft-tissue lesions.
• Farriery (critical): Restore mediolateral balance; facilitate early breakover; support the heels; avoid long toes and underrun heels. Corrective Farriery is a critical component of management.
• Rehab & load: Modalities to address OA related pain are appropriate together with progressive loading exercise and postural corrective work.
• Surfaces: Consistent firm surfaces are ideal; avoid both deep and hard surfaces.
• Surgery: DIP arthrodesis may improve comfort in severe cases; return-to-sport prognosis is generally poor.
• Return-to-work markers: Consistent heel-first landing, reduced post-work soreness, tolerance of shallow circles and transitional work without setback.

Owner message: The trim or shoeing cycle and surface choices matter as much as the exercise plan; small changes add up.

 

 

Equine Splints (Interosseous Desmitis/Periostitis of MC/MT2 or 4)

Definition: A bony enlargement along the splint bones (MC/MT2 or 4) secondary to interosseous ligament strain between the splint and the cannon (MC/MT3) or direct trauma; may include splint bone fractures.

Who gets them: Common in young horses entering work or stepping up load; conformational faults and hoof imbalance increase focal stress and can predispose to splint formation.

Presentation:

• Active phase: Palpable pain and heat over the splint, with variable lameness in the affected limb; splint hardens over weeks as exostosis forms.
• Inactive phase: Usually a non-painful bony “blemish” that rarely affects gait. Size may remodel but splints are typically considered permanent.

Differentials: Splint bone fracture, suspensory origin pain (especially with proximal exostoses), cortical stress reaction of MC3 (shin soreness).

Diagnostics (vet-led): Radiographs to check for fracture and exostosis; ultrasound for interosseous ligament and suspensory origin; scintigraphy if needed. Fractures may require stabilization or distal splint bone removal.

 

Management

• Acute (2–6 wks): Relative rest, load reduction, cryotherapy 24–72 h, NSAIDs as indicated; compression support if tolerated; gradual re-load guided by pain.
• Rehab & load: Address any training errors that may have caused an increased load, focus on progressive loading to encourage bone remodelling, evaluate and address postural or conformational challenges.
• Farriery: Correct balance to reduce focal strain; review mediolateral balance.
• If performance drops: Consider proximal exostosis impinging the suspensory origin, which requires veterinary imaging and a targeted plan.
• Prognosis: Excellent once inactive; performance is usually unaffected unless a fracture or impingement is present.

Owner message: Most splints settle with smart load management; don’t rush the rest phase.

 

Equine Windgalls

Definition: Soft, fluctuant swellings around the fetlock region from excess synovial fluid. Two patterns may coexist.

1. Articular windgalls: distension of the metacarpophalangeal or  metatarsophalangeal joint capsule (back and sides of fetlock).
2. Tendinous windgalls: distension of the digital flexor tendon sheath (around DDFT/SDFT).

Clinical notes: Often bilateral and symmetrical in hard-working or upright-limbed horses and can be a benign adaptation. Asymmetry, heat, pain, or lameness suggests active pathology (synovitis, OA, cartilage injury, or tendon sheath pathology) and warrants further investigation.

Diagnostics (vet-led): Clinical exam; ultrasound to assess tendon sheath, manica, and annular ligament; joint blocks to localize; radiographs to screen fetlock OA; MRI if suspected soft-tissue lesions persist.

 

Management

• If asymptomatic: Monitor size vs workload; optimize trim or shoeing;  evaluate and adjust working surfaces; post-work cold hosing or compression may help appearance.
• If painful, hot, asymmetrical or lame: Treat the underlying cause (synovitis, OA, SDFT/DDFT lesions). Medical options per vet; rehab focuses on progressive load tolerance and soft-tissue conditioning without provoking effusion.

Owner message: Puffy does not always mean painful; changes in symmetry, heat, or lameness are the cues to act.

 

Conclusion

For ringbone, splints, and windgalls, the throughline is the same: optimize hoof balance, respect conformation, and dose workload appropriately. Assess the whole horse – hoof mechanics, limb alignment, posture, and movement patterns – while factoring in surfaces and shoeing. Improving movement quality redistributes load away from overstressed structures, helping to mitigate signs and slow progression when paired with coordinated vet–farrier–therapist management.