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Equine

Splint Bone Injuries in the Horse

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By Dr. Garret Metcalf, DVM

Splint bone issue in horses is a common problem in various ages and disciplines. These injuries can be caused by excessive work in young horses to traumatic injuries. The splint bones do play an important role in the stability of the joints that they help make up at knee or hock level. These various types of injuries will be discussed in this article as well as treatments.

The splint bones are small bones that are intimately attached to inside and outside of the cannon bone. The splint bone is divided into sections to understand which section is injured. At the top you have the head of the splint, then a mid-body section and at the bottom the button of the splint. The head of the splint bones make up part of the carpus (knee) in the forelimb and in the hind limbs the hock. There is a fair amount of research that has demonstrated the role the splint bones play in the stability of these joints. A study conducted at Colorado State College of Veterinary Medicine noted that when larger portions of the splint bone were removed rotational stability was significantly impacted within the carpus including other directional forces affected.

Diagnosing splint bone injuries are rather straight forward with radiographs, but some cases ultrasound is also helpful. Some of the bone or callus formation that occurs around these splint bone injuries can compress on the suspensory ligament leading to chronic pain and lameness issues.

Popped Splints

Splints that are popped are referring to injuries that generally occur to the younger population of horses entering training and work. Younger horses generally develop these injuries on the inside forelimb splints and they can be rather painful leading to loss of training time. The popping of a splint is the tearing of a ligament that holds the splint bone to the cannon bone called the interosseous ligament. When the ligament is torn bleeding can occur and disruption of the periosteum of the bones causing a callus or firm boney lump. These splints are more prone to injury because the medial or inside splint on the forelimb bears direct load with the second carpal bone at the head of the splint bone. This puts direct force on the splint bone where other splint bones share the load of the adjacent carpal or hock bones with the cannon bone.

Popped splint bones are often rather painful, have notable swelling associated near the splint bone and will have heat present. When palpated or squeezed a moderate amount of pain will be elicited. 

Treatments of these popped splints are often rest, systemic anti-inflammatory drugs and local anti-inflammatory treatments. Acute inflammation from a splint injury can be soothed with ice or cold therapies and bandaging. Also alternative therapies such as cold laser therapy, MagnaWave or shockwave can be incorporated to the treatment plan. In some more extreme cases surgical removal of the bone callus is necessary to prevent the callus from compressing the suspensory ligament.

Splint Bone Fractures

Fractures of a splint bone can occur at any level or in any one of the splint bones but there are some that are more commonly fractured. The lowest or distal one-third of the splint bone is commonly broken in the forelimbs. These fractures can be occasionally to forelimb suspensory related issues. The suspensory is has a small ligament attachment to the button of the splint bone and whenever the lower limb is extended heavily this can put bending forces on the lower part of the splint bones leading to fractures. In the hind limb the outside or lateral splint bone is the most commonly fractured splint bone. This splint bone is often fractured from kicking injuries. Whenever two horses don’t get along back up to each other and fire some kicks, this splint is often the one that gets broken. These injuries are particularly more problematic because of the open wounds that are heavily contaminated with manure, hair and dirt, plus injuries to flexor tendons as well.

Fractured splints near the head of the splint are also very problematic injuries that can be career ending or life threatening at times for horses. These fractures can involve the joints of the carpus or hock leading to septic arthritis, severe lameness and possibly serious instability of the corresponding joint. The rule of thumb for equine veterinaries that are familiar with surgically removing damaged or fractured splint bone is the two-thirds one –third rule. The rule is the lower two-thirds can be safely removed and try to never remove the upper one-third if at all possible. Cases of complete splint bone removal can lead to chronic lameness or worse, catastrophic joint dislocation when the horse tries to get back up from anesthesia. Instead of removal of the fractured upper one-third of the splint, the fracture can in some cases be repaired with plates and screws to maintain a stable upper part of the splint bone.

Other smaller traumatic injuries that can occur to splint bones often come from interference injuries or the horses own feet hitting the inner splint bones when working. These injuries can be avoided rather easily with splint boots placed on the lower limbs whenever working. Some lower limb boots can provide some support to the fetlock and suspensory to avoid distal splint bone fractures but overall these are not going to be very protective.

Some splint bone injuries are rather simple and common problems that a lot of horse owners are familiar with addressing. When it comes to the more serious traumatic fractures and wounds related to splint injuries it is best to contact a veterinarian and get these examined.

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Equine

Vaccines: A Practical Part of Horse Health

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Vaccinations may not prevent every case of illness, but they remain one of the most effective tools horse owners have for reducing the risk of serious and sometimes fatal disease. The right vaccination program depends on the horse, where it lives, how often it travels and the animals it may encounter.

The American Association of Equine Practitioners divides vaccines into two categories: core and risk-based. Core vaccines are recommended for all horses because the diseases pose a significant health risk, may have public health implications or are spread by sources that owners cannot completely control. The core vaccines for horses are tetanus, Eastern and Western equine encephalomyelitis, West Nile virus and rabies.

Tetanus is caused by bacteria commonly found in soil and manure. The organism can enter through puncture wounds, cuts, surgical sites and other damaged tissue. Even a wound that appears minor can create an opportunity for infection. Previously vaccinated adult horses generally receive a tetanus booster annually. An additional booster may be recommended following a penetrating injury or before surgery if more than six months have passed since the horse’s last dose.

Eastern and Western equine encephalomyelitis and West Nile virus are spread primarily through mosquitoes. These diseases can affect the nervous system and may cause weakness, loss of coordination, behavioral changes, difficulty standing or death. Vaccination is generally scheduled before mosquito season begins. In regions with long mosquito seasons, a veterinarian may recommend boosters more frequently than once a year.

Rabies is uncommon in horses, but it is fatal and can be transmitted to people. Horses may be exposed through contact with infected wildlife, including bats, skunks, raccoons and foxes. Because horses frequently interact with owners, veterinarians, farriers and other handlers, annual rabies vaccination protects more than the individual animal.

Risk-based vaccines are recommended according to a horse’s individual circumstances. These may include vaccines for equine influenza, equine herpesvirus, strangles, leptospirosis, botulism and other diseases. A horse that remains on one farm with a closed herd may have different needs than a show horse that travels regularly, shares barns with unfamiliar horses and encounters animals from several states.

Influenza and equine herpesvirus vaccines are commonly considered for horses that travel or are frequently exposed to new horses. Equine influenza spreads quickly through respiratory droplets and contaminated equipment. Horses at increased risk may need boosters every six months, and some competitions or facilities require proof of recent vaccination.

Timing also matters. Vaccines do not provide immediate protection, and an unvaccinated horse may require an initial series of two or more doses. The AAEP recommends completing the primary series and needed boosters at least 14 days before likely exposure. Waiting until the day before a show or hauling trip does not give the immune system enough time to respond.

Mild soreness, swelling or a temporary fever can occur after vaccination. Serious reactions are rare, but owners should contact their veterinarian if a horse develops significant swelling, breathing difficulty, hives, weakness or other concerning signs.

There is no single vaccination schedule that fits every horse. Age, pregnancy, health, travel, local disease activity and previous vaccination history all affect the plan. A veterinarian can also make sure vaccines have been properly stored, administered and recorded.

Vaccination works best alongside good management. Clean equipment, limited contact with unfamiliar horses, isolation of new arrivals and prompt attention to illness remain important. Together, vaccination and basic biosecurity provide horses with a stronger line of defense against preventable disease.

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Equine

The Pull of the Barn

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When I was younger, I saw plenty of old Westerns. They were fun to watch, but one part always stressed me out. Inevitably, a cowboy would get shot or thrown from his horse, and while the cameras stayed on the fallen rider, I worried about the horse. Would it wander around lost on the prairie, never finding its way back? The truth is, most horses know exactly where home is. Turn one loose, and it will drift toward the barn. Ride one out, and the trip away from home feels steady, but the return picks up pace the moment the barn roof comes into sight. We even have a name for it: barn sour.

Horses are prey animals, and survival has always depended on familiar ground. For a domestic horse, the barn means food, water, and the company of the herd. Ethologists (scientists who study animal behavior) point out that horses are quick to learn patterns. When hay and grain appear in the same place every day, that spot becomes magnetic. Over time, repetition lays down mental trails as clearly as cattle wear down physical ones in a pasture. What appears to be stubbornness is actually instinct. The barn equals safety, and safety equals survival. Riders from cavalry days to modern ranches have written about horses quickening their pace on the way home. And though the land changes, that pull never does.

People are not so different. We all have barns in our lives — comfort zones we gravitate toward, routines that steady us. They serve a purpose. Like a horse standing at the gate, we lean on safe ground when life feels uncertain. But the pull can also hold us back. A horse that refuses to leave the yard never discovers what lies beyond the fence, and the same is true for us.

That balance shows up in history too. Old cattle trails once served their purpose, guiding herds north and helping to build economies. But when railroads and fences changed the landscape, those well-worn tracks became ruts. Progress required new paths. Our own habits work the same way. Some keep us grounded. Others only circle us back to where we started.

When I see my horses drifting toward the barn, I think less about impatience and more about instinct. They are drawn to the familiar, and so am I. The barn matters. It is the anchor point, the place of rest. But the pasture matters too, because growth is waiting outside the gate.

Those old Westerns had it right in at least one way. The cowboy’s horse was never going to wander off aimlessly. It would head back to camp, back to the barn. That simple truth still plays out in every pasture and arena today. Horses know where home is. The question is whether we will let the pull of our own barns keep us tied too tightly, or whether we will use them as a base to step farther into the wide-open ground ahead.

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Equine

Trailer Safety Checklist

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By Janis Blackwell

As the season arrives to gear up for participation in your equine event of choice, one thing remains a constant for all horse owners. That constant is our responsibility to insure the safety of our horses by being diligent to maintain the integrity of the trailers in which we haul them. There are a number of things that can be dangerous both inside and outside of your trailer. Whether you traveled all winter long or whether your trailer sat unused or was used very little through the cold weather months, at least once a year your trailer is due a thorough going over. So here we go with a checklist that will help you insure a happy and safe trip for you and your equine partner.

  1. A sound floor is absolutely imperative. Whether your floor is aluminum, steel or wood, it should be cleaned regularly after use to preserve it. Urine and manure will erode and weaken all types of floors. Even rubber mats will not prevent erosion of your floor. (Maintenance tip: remove mats and wash aluminum floors often to prevent erosion.)
  2. Especially check wooden floors for rotten boards. Immediately replace questionable flooring before hauling. (Maintenance tip: For wood, remove mats and wash out manure and debris. Coat wooden floor in a cheap motor oil. Allow to sit in hot summer weather until the oil soaks in. Be careful—floor will be slippery until oil cures into the wood. This treatment yearly will preserve a wooden floor for much longer than normal as it repels urine and protects the wood).
  1. Keep the interior and exterior washed to enable you to check for rusted out places, leaks, etc.
  2. Have a professional check your brakes at least once yearly to be sure they are operating properly.
  3. Be sure tires are inflated to the proper air pressure, and check the inside of each tire for hidden unusual wear that could cause a blowout. Replace worn tires before leaving home.
  4. Wheel bearings must be checked and packed at least once a year. This should be done even if the trailer has been rarely used since the last time the wheel bearings were packed. In fact, trailer maintenance professionals say that sitting stationary and unused is even worse for the bearings.  Improper care and maintenance of wheel bearings can cause a wheel to seize up and actually twist off while in use. Use a horse trailer professional for this maintenance task.
  5. Axles should be checked for bowing. A bent or bowed axle can cause excessive tire wear and damage wheel bearings.
  6. There should be no more than two inches in height difference from the front of the trailer to the back. More difference than that causes the bulk of weight of the trailer and its contents to ride mostly on the rear axle causing it to bow and wear on both tires and wheel bearings.
  7. Another critical part of the trailer to keep an eye on are the butt chain or bar and the back door. The butt chain or bar should be firmly attached to the wall and its keeper and should always be latched. The door should have a strong secure latch with a pin to insure it stays latched while in motion.
  8. Finally, but certainly not of least importance is a thorough check of the trailer hitch including ball and coupling. Keep the ball well greased. Periodically, check to see that the ball is still securely tightened and the latch on the coupling is working properly.

These few critical safety check points can save you money, stress and the wellbeing of your horse. Until next time, happy trails and safe traveling.

This article was originally published in the April 2016 issue of Oklahoma Farm & Ranch. 

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