Bone Splints


Has your horse ever “popped a splint”? Bone splints can range from a cosmetic blemish to serious lameness that requires surgery to correct. The horse develops a painful bony swelling that arises from inflammation of one of the two small bones (splint bones) on either side of the cannon bone below the knee and hock.

Splints are common in young horses that are too active or over-lunged at an early age. The inflammation can be the result of blunt trauma from a kick or interference, and can also be caused by excessive strain from overwork or excessive activity, tight circles, or torque on the lower limb. Lots of excessive work on hard ground can cause a splint and it can be anything from a small lump growth to a fracture. Quite often vets describe a splint as a ‘shin splint humans get when running on tarmac’.

Mild splints involve damage to the ligament that holds the splint bone to the cannon bone. The result is mild or no lameness and a painful bony swelling. With more severe splints, especially when they arise from blunt trauma, the splint bone could be fractured, and lameness can range from mild to severe.

Splints can be prevented by using splint boots or polo wraps when working young horses, or for turnout if your horse is playful and active. It is also important to avoid overworking young horses (i.e., no riding until three years of age, and no high impact work until five years) and to limit tight circles and lunging.

To properly diagnose a splint, your veterinarian will lift up the horse’s lower leg and palpate the splint bones. If the bony swelling is associated with the splint bone, then a splint will be suspected. The veterinarian will check to see how much pain any pressure (palpation) on the swelling causes the horse, and if there is lameness present.

• If there is no pain on palpation and no lameness, then it is likely the splint has been there for some time and has already healed – it’s not an “active” splint. At this point, the splint is simply cosmetic and should not cause further problems. If you are certain the splint just came up and you think your horse is just being stoic about it, it doesn’t hurt to treat it like a mild splint. Otherwise, treatment is not indicated.

• Mild splints are commonly painful on palpation, but there will be no lameness. In this case, a basic treatment plan should be started and continued until there is no longer any pain on palpation.

• If there is lameness present, or the pain or swelling is more severe than your veterinarian usually sees with a mild splint, x-rays will be necessary to rule out a fractured splint bone. In most cases, splints are mild and x-rays are not necessary, but when in doubt, have the diagnostics done so you know what you’re dealing with and how to treat it.

The treatment of all active splints consists of cold therapy, wrapping, anti-inflammatories and rest. Cold therapy: Apply ice or cold hosing for at least 15 minutes twice a day.

1. Cold therapy can be applied for one hour three to four times a day or more, if needed in more severe cases. Continue treatment until there is no more inflammation. It is important to note, however, that it is unlikely the bony swelling will ever resolve completely. To tell if the inflammation has resolved, monitor the swelling for heat and pain. It should not be getting bigger, and may even shrink a bit.

2. Wrapping: The limb should initially be wrapped with a pressure wrap (during the first one to two weeks), then support wraps can be applied (12 hours on, 12 hours off) to help minimize complications of long term wrapping. In severe cases, constant wrapping may need to be continued long term, so be sure to consult your veterinarian for an individual time frame.

3. Anti-inflammatories: Most veterinarians will prescribe an NSAID such as Bute or Equioxx for bone splints. Depending on the severity, many cases respond well to herbal anti-inflammatories such as Equilite’s Ani-Motion, which contains devil’s claw, yucca, chamomile, white willow and rosehips, and NSAIDs can be avoided. In cases of moderate inflammation, the topical NSAID Surpass in addition to an oral herbal formula could help; there are fewer side effects with topical NSAIDs. When lameness is present or inflammation is severe, it is best to use oral NSAIDs (Bute, etc.), as the long term benefits to your horse outweigh the risks. Topical DMSO treatment can also be very helpful for anti-inflammatory treatment and seems to give the best cosmetic results by reducing the size of the bony swelling. Monitor for skin irritation, however, especially if the leg is wrapped, and discontinue use if irritation occurs. Otherwise, DMSO can be used for the first month – beyond that, it is unlikely to reduce the size of the bony swelling.

4. Rest: This is the most important part of splint treatment. Mild cases can take three to six weeks to heal, and more severe cases can take three to six months or longer. Basically, the horse should be rested until the splint has completely healed, then slowly returned to work once there is no lameness or pain on palpation of the splint. He should be hand walked during the rest period after the first two to four weeks. As with all injuries requiring rest, your horse’s emotional health must be taken into consideration. A horse that is stressed out, pacing and circling in the stall, and whinnying for his friends is not a horse on rest. In some cases, it is better for the horse to be turned out where he may trot once or twice across the pasture, but be generally calm and quiet, rather than have him separated from his buddies. Ideally, the horse would be stalled or in a small paddock with a buddy next door on the same schedule so that he remains calm and quiet.


• A new treatment that has proven highly effective in acute injuries such as splints is SCENAR therapy. SCENAR is similar to acupuncture with E-stim (which would also be helpful for treating a splint), but it works through the biofeedback system to treat the problem with an electrical impulse.

The SCENAR device uses skin electro-stimulation and the signal is very close to a natural nerve impulse enabling the body to recognise and respond to it.

• A number of natural topical creams/salves can also be highly effective such as Traumeel (a homeopathic cream with Arnica) for many acute injuries to help decrease bruising and inflammation. Topical SOD cream (free radical scavenger) can also help decrease pain and inflammation. Dynamite Wound Balm is another wonder salve that seems to help treat most wounds and injuries. Additional herbal treatments containing comfrey and calendula, or in case of fracture, a Chinese medicine herbal liniment such as Zheng Gu Shui (Setting Bone Liquid) can help accelerate healing.

• Local magnet treatment may also be useful after the acute inflammatory phase to help bring circulation to the area. Such as EQU Streamz.

There are many things you can do to treat splints, so in most cases, have no fear – there will not be any lasting lameness or problem other than a cosmetic blemish. Splints are quite common, and if they are mild and no lameness is present, they often go unnoticed until your horse’s annual health check. If you find your horse has a splint, be sure to consult with your veterinarian to have the injury properly diagnosed. A treatment plan can then be tailored to your horse, depending on the diagnosis.


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