Friday, November 7, 2014

Horse, Heal Thyself | 11/7/2014

Regenerative Therapies

By Pam Gleason, Photography By Gary Knoll

All horses have one thing in common: They are susceptible to injury. Horses that are athletes are at an even greater risk. Not only do they get cuts, bruises and hoof troubles, they can also be prone to a whole litany of sports injuries, from strained tendons and ligaments to sprained joints and broken bones. Keeping horses sound is a main goal of most training programs. Restoring them to soundness after an injury has traditionally been a long, and sometimes frustrating endeavor.
Dr. Jamie Carter with an IRAP kit. Blood is collected in a
syringe that has a small collection of glass beads in it. The
beads encourage the production of enzymes and anti-
inflammatory chemicals when the blood is incubated. Then
the red and white blood cells are spun off in a centrifuge,
and the serum that is left becomes a personalized anti-
inflammatory join injection.

The likelihood of a hurt horse returning to work depends on what structures he has damaged and how badly. Another factor is how the horse handles his recovery. By their nature, horses with orthopedic injuries are not good patients. You can’t tell them to stay off their feet. If they were very fit at the time of their injury, they are likely to become restless and possibly self destructive when they are suddenly confined to a stall.

To complicate matters, athletic injuries in horses often do not heal very well. The most common injuries are to tendons and ligaments, and these body parts are notoriously slow to mend. They also tend to heal with scar tissue that is both less flexible and weaker than undamaged tissue. Because of this, horses with serious tendon and ligament injuries have traditionally not been able to return to their previous level of competition.

Over the centuries, there have been many ways that horse owners and their veterinarians have tried to encourage tendons and ligaments to heal successfully. Early on, veterinarians recognized that neither tendons (which attach bones to muscles) nor ligaments (which attach bones to bones) have very much blood flow, which is one reason why they heal so slowly. Early methods of increasing blood flow included putting blistering agents on the skin, or even pin firing the damaged tissue, which involved sticking it with a burning probe. These “counter-irritation” methods may have done some good, and they are occasionally still used, although they are decidedly old school. How old? Counter-irritation was once commonly used on people, too, and has its origin in the ancient medical theory that says that sickness and injury is the result of an imbalance in the body’s four “humors” (blood, black bile, yellow bile and phlegm.) Blistering and its cousins, bloodletting and induced vomiting, were supposed to help bring the humors back into balance.

Today, there are more modern ways to promote healing based on recent advances in science. The so-called "regenerative therapies" use small amounts of the horse’s own blood, fat and bone marrow to create custom-made, personalized medicines that can be injected into damaged tendons, ligaments and joints. These relatively new treatments provide the horse with concentrated amounts of his body’s own healing and anti-inflammatory chemicals delivered directly to the site of the injury. With their aid, along with a prescribed regimen of rest and progressive exercise, horses with injuries that once would have been career-ending have been able to return to the racetrack, the competition arena and the trail, with tendons and ligaments that truly are as good as new.

These therapies may sound out of the reach of the average horse owner, but they are not. Veterinary clinics here in Aiken use them on a regular basis. If your veterinarian does not have the technology inhouse, he or she can work with one of the larger clinics, or even with a company such as Comprehensive Blood Management that specializes in providing custom blood products to veterinary and human clinics. There are several different types of regenerative medicine that are available now, and veterinarians who use them say they have greatly improved the prognosis of horses with serious injuries.

Stem Cell Therapy

Stem cells are immature cells that have the ability to turn into any kind of cell in the body. True stem cells are found only in embryos and in navel cord blood, and they are not currently being used in any commercially available veterinary treatments. The type of stem cells used in veterinary medicine are called mesenchymal stem cells. These cells have the ability to become connective tissue (bones, ligaments, tendons and so on.) They can be isolated from the bone marrow and fat of adult horses. Stem cell therapy requires the veterinarian to harvest a small amount of bone marrow or fat from the injured horse. He then sends that tissue to a specialized laboratory for processing and culturing to increase the concentration of stem cells. The concentrated product is then shipped back to the veterinarian who injects it into the injured structure right at the site of the injury.

This injection doesn’t necessarily make a tendon or ligament heal faster, instead, it is said to help it to heal with healthy tissue instead of scar tissue. Exactly how it works is still being studied, but it is likely that the positive effects come from a combination of the stem cells turning into healthy tissue, along with natural growth factors, anti-inflammatory factors and other chemical signals that recruit cells to come to the site of the injury. The idea is that the injection, made from the horse’s own body, super-charges the horse’s ability to heal himself.

Stem cell therapy takes several weeks, since the raw material needs to be shipped to the lab and cultured for several weeks and then shipped back. It is also expensive, costing somewhere in the $2,500-$3,000 range.

Bone Marrow Aspirate

Before concentrated stem cells became available, veterinarians tried to improve healing through injections of raw bone marrow. Bone marrow can be drawn from the horse’s sternum, at the area of his girth, with a long needle. It can then be immediately injected into a damaged tendon. This technique came into use in the mid-90s and it is said to be helpful for horses with both chronic and acute tendon and ligament injuries.

The original theory behind bone marrow aspirate is that it works by delivering stem cells to the injury. More recent research has shown that the concentration of stem cells in the bone marrow is relatively low, and that any positive effects of this treatment may come from various growth factors and other chemicals present in marrow. The procedure is quick and relatively inexpensive, with a price of less than $400, making it the least expensive of all the biological therapies.

PRP

PRP, which stands for platelet rich plasma, is the latest entry into the equine regenerative therapy market. PRP has a history that goes back to the 1970s, but it didn't come into common use until the 1990s when the machines needed to make it became more convenient and affordable. It was most commonly used by dental surgeons who wanted a way to help their patients heal, and was first used on human tendons in 2006. It entered popular consciousness in 2009 after Hines Ward, the Pittsburgh Steelers' wide receiver, used it on a sprained knee before his team went on to win the Superbowl. Other athletes who have been known to use PRP include Tiger Woods, Rafael Nadal and Kobe Bryant.

Platelets are cells that circulate in the blood and bind together when they find an injury. They also contain at least nine different types of growth factor that are assumed to help speed healing. In the veterinary clinic, PRP is made by drawing a large syringe full of the horse's blood and putting it into a centrifuge that separates the platelets and the plasma from the red blood cells. Then the plasma is put through another machine that concentrates the platelets. PRP may also include some factors from white blood cells, such as Interleukin 8, a signaling protein that stimulates the creation of blood vessels and recruits other types of cells that combat infection and heal wounds. PRP can be made in a matter of 15 minutes or so, and then injected directly into the site of the injury. In horses, it is mostly used in tendons and ligaments, but it can also be used on other types of injuries, such as lacerations.

Although practitioners say it may not be entirely as effective as stem cell therapy, PRP has many advantages. First, it can be created and injected right away: you do not have to wait for it to be cultured and shipped to and from a distant laboratory. Second, it is significantly less expensive, costing an average of $800 to $900.

IRAP

Dr. Tom Stinner demonstrates the Magellan PRP
machine at South Equine Service.
IRAP stands for interleukin-1 receptor antagonist protein. Like PRP, it is made from the horse’s own blood and can be processed right in the veterinary clinic. For IRAP, the veterinarian draws a large syringe full of blood from the jugular vein. The blood is incubated in a special syringe that contains a collection of small glass beads. The beads encourage the white blood cells to secrete various enzymes and therapeutic proteins. Then the blood is put into a centrifuge and the red blood cells are spun off, leaving behind a protein rich serum. This serum is split into six to eight 3 mL doses to make up a course of treatment. One dose can be used right away, while the rest are frozen until they are needed.

IRAP is generally used for damaged joints rather than for tendons and ligaments. It has potent anti-inflammatory properties, and is used for horses with arthritis, for horses that have recently undergone joint surgery, and for horses that have traumatic damage to their joints. IRAP injection can take the place of an injection of corticosteroids or hyaluronic acid. Its main advantage is that, where corticosteroids tend to have side effects, IRAP does not. Veterinarians also say that IRAP tends to last longer than traditional joint injections. A course of IRAP therapy is usually three injections given a week to 10 days apart. Extra serum can be saved for later injections: it is supposed to be used within a year. The cost to make the course of injections is in the neighborhood of $1,000 to $1,200.


Right for Your Horse?

"We do these therapies almost every day," says Dr. Jamie Carter of Southern Equine Service on Banks Mill Road. "The treatment we use most is IRAP."

"It isn’t just a high end treatment any more," adds Dr. Tom Stinner, who also practices at Southern Equine Service. "Part of it is that people are more educated about it and ask for it; part of it is that it isn't as expensive as it used to be. We also recommend it. Any horse that does enough that it might injure a tendon is a potential candidate."

Dr. Carter agrees. "I've done hunt horses, even trail horses. I've done it for people who love their horse, and he might have strained something or torn something, and they'll do it because they know it is right for him."

The clinic at Southern Equine Service is technologically up to date and has a room with machines for making PRP and IRAP injections. IRAP is so popular that there is even an entire freezer dedicated to storing injections for clients’ horses, about 100 at this writing. Dr. Carter says that in addition to IRAP for joints, he is also a proponent of bone marrow aspirate for tendons and ligaments, and has been using it since at least 1999. Dr. Stinner says that stem cell therapy has gotten less popular recently, mostly because PRP is so much more convenient and effective.

"A few years ago stem cells were supposed to be 'the thing,'" he says. "And they have been very helpful. But now, as far as the end result of having a sound horse that can return to his former level of activity, there isn’t that big of a gap separating stem cells from some of the other therapies."

Dr. Eric Johnson, who practices at Performance Equine Vets on route 78 is also a proponent of regenerative therapies.

"These are therapies designed to produce the best possible results when faced with fairly traumatic, sometimes career ending injuries," he says. "If we want to give a horse the best possible shot, we employ them."

He stresses however, that none of these therapies is magic. The horse still needs to be treated like an injured horse. It still needs stall rest followed by a progressive and controlled exercise program.

"How well it turns out depends on a case by case basis. A fair amount of having a good result is patient compliance. If everything is done as recommended by the veterinarian, we're pretty confident of a good result. We don't usually stop with just PRP or whatever we have used. We usually follow that up with shockwave therapy and a very restrictive exercise regime. If all of these procedures are followed, we get very, very good results in terms of animals returning to performance and their tendons healing well."

Drs. Carter and Stinner agree, saying that any biological treatment is just a part of a comprehensive rehabilitation program that might include traditional supportive therapy (wrapping, poulticing) as well as newer treatments such as shockwave therapy. Controlled, progressive exercise is also crucial to help the recovering structure heal correctly. Although the veterinarians say that there are some types of injuries that are unlikely to be cured by the regenerative therapies available today, these therapies seem to be helpful for many different conditions.

"Condition for condition, you have a better shot with these things than without them," says Dr. Stinner. "You may have no shot without them."

Dr. Carter adds that, with regenerative therapies, as with any other new technology, there is a tendency to think that the new treatment might be a panacea. It is important to remember that a new technology or a new machine is only as good as the person using it, and none of these technologies can take the place of good vet work.

"The number one thing I always tell everyone is that when you go to use any new therapies, be sure you are treating what is causing the lameness," says Dr. Carter. "The lameness needs to be localized, and you have to have a clear idea of what you are doing. It all boils back down to good veterinary medicine: palpating, blocking, x-raying, ultra sounding. Blocking is extremely important so that you are sure you are treating the right thing."

New Treatments, New Hopes

Although you could not yet say that regenerative therapies have provided the ultimate solution for orthopedic injuries in horses, they have at least brought their treatment into the 21st century. Research is still being done on other uses for IRAP, PRP and similar therapies, and there is still work to be done on making the treatments more effective. Although most practitioners probably recognize their potential, everyone doesn’t agree on how useful they are, and some studies have failed to show that they are particularly more effective than supportive therapy and controlled exercise alone. Elite human athletes use PRP and IRAP and swear by it, but it remains a controversial treatment in the U.S., and does not yet have solid backing in the scientific community, either for people or for horses.

In the future, biological treatments will probably be fine-tuned and adjusted. There will also probably be new treatments developed as researchers search for cures for major conditions such as arthritis and spinal cord injury. Advances in veterinary treatments tend to follow advances in human medicine, and even, sometimes, to precede them, simply because it can take so long to get something novel approved for human use.



"There are a lot of great new things coming, I'm sure," says Dr. Carter. Dr. Stinner agrees. "We are probably only scratching the surface."

This article is copyrighted and first appeared in The Aiken Horse. It is reprinted here by permission.

Friday, October 31, 2014

All Eyes on Normandy | 10/31/2014

Getting Ready for the World Equestrian Games

By Pam Gleason

The Alltech World Equestrian Games are coming to Normandy, France on August 23. The "WEG" are the world championships for the eight equestrian disciplines that are governed by the Federation Equestre Internationale (FEI). They have been held every four years since 1990, alternating with the equestrian sports at the Summer Olympic Games every two years. Like the Olympics, the WEG travel to different locations around the world: this is the first time they will be held in France. The last games were in 2010, when they were at the Kentucky Horse Park in Lexington. The next games, in 2018, will be back on this side of the Atlantic at the Olympic Equestrian Park in Bromont, Quebec, a venue that was built for the 1976 Montreal Olympics.

This year's WEG will run for two weeks, from August 23 until September 7. Championships will be decided in these disciplines: showjumping, dressage, eventing, combined driving (four-in-hand only), endurance, reining, vaulting and para-dressage. In addition, there will be two demonstration sports. One is a polo match, the other a horse-ball tournament.

The majority of the competitions will take place in the city of Caen, the region’s capital, where there are four competition sites: D’Ornano Stadium (opening and closing ceremonies, jumping, dressage and the stadium phase of eventing); Prairie racecourse (combined driving), the Exhibition Center (reining) and the Zenith indoor arena (vaulting.) The dressage and cross country phases of eventing will play out at Le Haras National du Pins, an equestrian and breeding center built under Louis XIV in the 17th century. Le Haras du Pins is about an hour’s drive from Caen’s city center, and is famous for (among other things) being the birthplace of the Percheron breed. It has a new cross-country course designed for the games by Pierre Michelet, who will also create the course for the 2016 Olympic Games in Rio de Janeiro.

The endurance competition will be run in the countryside to the west of Caen, with a loop along the beach on the Bay of Mont Saint Michel. Mont St. Michel, a spectacular island fortress and monastery, will be visible in the background.

The exhibition polo match is scheduled for September 6 in Deauville, which is one of France’s top polo destinations. Deauville is on the Normandy coast, about 60 kilometers east of Caen. The 18-goal polo match will pit a French team against a mixed team of one player from Europe, one from North America, one from South America and one from Australia/New Zealand. The actual teams have not yet been announced, although presumably the rosters will be drawn from players already in Europe for the season. This is the first time that polo has been included as an official exhibition at the World Equestrian Games, and some polo enthusiasts hope that its acceptance might lead to its becoming an official WEG competition in the future. Polo was once, after all, integral to the equestrian events at the Olympics. Its last Olympic appearance was in Berlin in 1936, where an Argentine team defeated a British one by the devastating score of 11-0 in the finals.

The horse-ball tournament takes place from August 27-31 at the equestrian center of Saint-Lo, about a 45-minute drive from Caen. Horse-ball is a highly popular sport in France. Derived from the Argentine game pato, it came to the country in the 1930s and was standardized in the 1970s. Variously compared to rugby, basketball and even quiddich (the imaginary flying game from the Harry Potter book series), horse-ball calls for two mounted teams of four players each. The teams attempt to score goals by throwing a ball equipped with leather handles through a vertical net. Like polocrosse (another polo cousin) it emphasizes teamwork and prohibits ball-hogging. You must pass the ball three times to three different teammates before scoring a goal, and you are not allowed to carry the ball for more than 10 seconds.

There are actually two horse-ball tournaments, one for women and one for mixed teams. Four nations are sending teams (France, Spain, Belgium and Italy) and the matches will be held in the evenings from 6 to 10 p.m. Organizers are promising a good show, including a pregame exhibition on Shetland ponies and professional cheerleaders. France, which is essentially undefeated in international competition, is favored to win. Horse-ball has not yet caught on outside of Europe, and is almost unheard-of in the States, although there have been occasional demonstrations at equestrian trade shows.

As for the official events, the WEG promises fierce competition. According to the Alltech WEG website, 74 nations have been nominated to compete, which represents an increase of about 25% over 2010, as well as an all-time high. Twelve countries will be making their WEG debut, including the U.S. Virgin Islands, Hong Kong, Romania, Thailand, Peru and Kazakhstan. Nine countries, including the U.S., expect to compete in all eight disciplines.

How will the U.S. teams fare? A lot is riding on that question, especially in the Olympic disciplines (showjumping, dressage and eventing) where the country has had some disappointing results in recent major world competitions. At the 2012 Olympics, for instance, U.S. riders were unable to take home a single medal, either in team or in individual competition, their worst performance in over half a century. At the 2010 WEG, held on their own home turf in Kentucky, American eventers and showjumpers also came up empty, leaving Steffan Peters on Ravel, who won the individual bronze in dressage, the lone medalist in the Olympic sports. Americans did better in other arenas, winning the gold in team vaulting, as well as in team reining, along with the gold and silver in individual reining.

This year, Americans are once again favored to dominate reining, which is, after all, a quintessentially American horse sport. Other disciplines are less certain. The U.S. dressage team hopes to finish at least fourth, which will ensure that the team will be qualified for the 2016 Olympics in Rio. A team medal, bronze or even a brighter, is not out of the question: Robert Dover, who took over as chef d’equipe of the dressage team after the London Olympics is said to be optimistic. The best hope for an individual dressage medal is generally acknowledged to be Steffan Peters and Legolas, the two time National Grand Prix Champions. The pair have been earning top placings and high scores in Europe. Other team members (especially Lisa Wilcox on Denzello) have also stepped up this summer and may be ready to shine. The U.S. does not have a terrific history in dressage: a third place team finish has often been regarded as “winning” since some of the European nations (Germany, The Netherlands) have been seen as unbeatable. But national dominance can change. After all, Great Britain won the team gold and the individual gold and bronze at the 2012 Olympics. Those three medals were the first Olympic dressage medals ever for the country, which is now seen as a favorite.

In showjumping, the American team shows signs of regaining the world-class form that propelled it to the gold medal at the Beijing Olympics in 2008. In early August, for instance, Beezie Madden, riding Abigail Wexner’s Cortes C, became the first woman ever to win the Longines King George V Gold Cup at CSIO5* Hickstead, England. U.S. teams also won the Furusiyya FEI Nations Cup both at Hickstead and at Gijon (Spain.) Hopes are certainly high, although there are no guarantees that the rails will stay up when the competition begins.

Hopes are also high for the Land Rover U.S. Eventing squad, which has some extremely impressive members, including Buck Davidson, who is currently ranked third worldwide by the FEI. Aiken will be represented in Normandy by three members of the squad. These are Phillip Dutton on Trading Aces (owned by the Trading Aces Syndicate LLC), Boyd Martin on Shamwari 4 (owned by the Shamwari Syndicate LLC) and Kim Severson on her own horse, Fernhill Fearless. All three of these riders make Aiken their winter training base, and are frequent participants in the area’s many events and horse trials from January through March. Phillip and Boyd are also listed as alternates on Mighty Nice and Trading Aces, respectively. Jan Byyny, another rider who trains in Aiken, was named as an alternate on her family’s Inmidair, but she recently withdrew him after he sustained a minor injury.

The Alltech World Equestrian Games website says that over 80,000 tickets are still available for many sessions. Ticket prices are more reasonable than they were in Kentucky in 2010: for instance, tickets to watch the dressage start at 12 Euros (about $16), while showjumping tickets start at 30 Euros ($40) and you can watch reining for 20 Euros (about $26.) In Kentucky, the least expensive tickets were $25 and went up to $45 for some other, lower profile events such as vaulting. Tickets to reining started at $90, and most of the showjumping and dressage sessions were $100 or more. Organizers in France say they have sold over 300,000 tickets to the 2014 games so far and are expecting over half a million spectators.

Spectators and competitors alike are looking forward to the WEG experience, which will include a trade fair, equestrian demonstrations and shows. There will be exceptional food and drink (think oysters and Champagne), spectacular scenery and historic architecture. (For instance, you can tour the Chateau de Caen, built in 1060 by William the Conqueror.) All of this is in addition to what will be one of the largest gatherings of equestrian competitors in history. 

Can't make it to France? You can still watch the action if you have a computer and a good Internet connection. FEI TV (www.feitv.org) will be offering live streaming on their website, and you can find highlights on the FEI TV YouTube channel. You can also download the Alltech WEG app on your iPhone or Android device (available August 10) for schedules, live scores, results, news photos and videos. You might not be there, but you can be virtually there. Let the games begin.

This article is copyrighted and first appeared in The Aiken Horse. It is reprinted here by permission.