Joints,
Hocks, Stifle, sacroiliac, SI

Uses & side effects

Joints, Hocks, Stifle, sacroiliac, SI

Product-specific side effects await source review.

Drug interactions

Equine joint injections (intra-articular therapies) for high-load, high-motion, or deep axial joints like the hocks, stifles, and sacroiliac (SI) joints utilize specific combinations of anti-inflammatories, lubricants, or biologic agents. The choice of medication depends heavily on whether the goal is rapid inflammation reduction or long-term joint tissue regeneration.1. Traditional Medications (The Standard Cocktail)Veterinarians typically inject a combination of a potent anti-inflammatory corticosteroid and a joint lubricant directly into the joint capsule:Triamcinolone Acetonide (Kenalog®): A fast-acting, highly effective corticosteroid. It is the preferred choice for high-motion or large joint spaces (like the upper joints of the hocks or the stifle) because it reduces inflammation without damaging cartilage. It carries a strict USEF/FEI withdrawal window due to a historical, rare association with laminitis at high systemic doses.Methylprednisolone Acetate (Depo-Medrol®): A long-acting, dense corticosteroid. It is primarily reserved for low-motion, narrow joint spaces that are already undergoing arthritic fusion, such as the lower tarsal joints of the hocks. It provides long-lasting pain relief but can be cartilage-degenerative over chronic use, making it less ideal for high-motion joints.Betamethasone Acetate: A potent, clean corticosteroid that balances rapid onset with an extended therapeutic duration, frequently utilized as an alternative to triamcinolone.Hyaluronic Acid (HA): A synthetic version of the horse’s natural joint fluid. It is almost always mixed directly into the syringe with the chosen corticosteroid to instantly restore fluid lubrication, shock absorption, and viscosity within the joint.2. Biologics and Regenerative TherapiesFor horses with advanced arthritis, soft-tissue tearing within the joint (like stifle meniscal damage), or those competing under strict zero-tolerance drug testing rules, veterinarians use autologous therapies derived from the horse's own blood or bone marrow:IRAP (Interleukin-1 Receptor Antagonist Protein): The horse's blood is harvested and processed to amplify anti-inflammatory proteins. It is injected into the joint in a series of doses to block the specific destructive proteins responsible for arthritis, offering a drug-free therapeutic option.ProStride (Autologous Protein Solution / APS): A single-injection biologic processing system that concentrates both anti-inflammatory cytokines and anabolic growth factors. It functions like a combination of IRAP and PRP to provide rapid, long-term relief in a single veterinary visit.Polyacrylamide Hydrogels (Arthramid® Vet / Noltrex® Vet): A non-pharmaceutical, synthetic hydrogel injected into the joint. Instead of altering chemistry, it physically integrates into the synovial membrane to increase elasticity, reduce friction, and cushion the joint. It is highly favored for performance horses because it contains zero regulated drugs and has an incredibly long duration of efficacy.Platelet-Rich Plasma (PRP) & Stem Cells: Typically reserved for severe joint damage, structural defects, or adjacent ligamentous tearing (such as the deep sacroiliac ligaments surrounding the SI joint).3. Sacroiliac (SI) Joint SpecificsBecause the true SI joint rests deep beneath the horse's pelvis, it cannot be injected using standard surface landmarks. Veterinarians must use a long spinal needle guided via a rectal ultrasound or an ultrasound-guided top-down approach.Due to the massive, deep muscular area surrounding the SI joint, veterinarians frequently use a high-volume "SI block" consisting of corticosteroids (like dexamethasone or triamcinolone) mixed with a long-acting local anesthetic to soothe the adjacent sacroiliac ligaments and sciatic nerve pathways.

Contraindications