Fran Jurga`s Hoofcare + Lameness: gait

Showing posts with label gait. Show all posts

Tuesday, January 28, 2014

Coolmore's Daddy Long Legs to Run Without Shoes in Dubai Stakes Race; Interference Given as Reason for Rule Exception

Halfway around the world, a South African racehorse trainer is taking a chance with a well-known stakes-winning Thoroughbred. And he had to get official clearance to do it.

Click this link to read the rest of this article

Thursday, May 23, 2013

Lameness Evaluation: American Sensor System Tests Successfully in British Research

Flexion testing, using the sensor-based system, at the University of Glasgow's School of Veterinary Medicine

For many years, opinions on the value of flexion tests in assessing equine lameness have been divided. Now, however, new research looks set to turn what has always been regarded as a subjective process into a wholly objective one.

A comprehensive study, published in a November 2012 supplement to the Equine Veterinary Journal (EVJ) in partnership with the American Association of Equine Practitioners, showed that a wireless, inertial sensor-based system can effectively measure the horse’s response to a flexion test.

Click this link to read the rest of this article

Sunday, August 19, 2012

Hoof Blog Fun: Animated Anatomy Models of the Imagination

It's Sunday, so let's have some Hoof Blog fun.

As you can imagine, the walls here at Hoofcare Publishing are plastered with new and old anatomy posters and gait diagrams.

This one needs a stud girth and over-reach boots.

One day I started wondering about the horses who model for anatomy diagrams. Were they chosen for their ideal conformation--or did they even exist at all? Are there such ideal horses out there?

I like to think that when I turn out the lights in the office at night, the fun begins. Books open and close on their own. Trophy hammers hit on trophy shoes (but never leave a mark). Rasps rise up and sing a duet.

But until I saw this video, I hadn't considered what might happen with the anatomy posters and the gait charts. Maybe they have fun too and those horses that stand still so perfectly all day on the wall suddenly rear up and take off.

Michael Mansfield, who animated the anatomy models in this video, obviously has a great sense of humor, as well as a lot of patience to have animated all these still images.

What's wrong with this picture?

Obvious too is that Mike Mansfield's anatomy model horses never attended a Hilary Clayton lecture on equine locomotion.

I like to think that when I turn out the lights tonight, all those perfect standing models will give the gallop a try.

Thanks to Mike Mansfield, for inspiring me to think that anatomy diagrams might have a secret life!

Let's just hope they gallop more like this horse, used in an equine locomotion research project at the Royal Veterinary College in England:

Hoof and lower limb anatomy like you've never seen--and you control it! Click to orde

© Fran Jurga and Hoofcare Publishing; Fran Jurga's Hoof Blog is a between-issues news service for subscribers to Hoofcare and Lameness Journal. Please, no use without permission. You only need to ask. This blog may be read online at the blog page, checked via RSS feed, or received via a digest-type email (requires signup in box at top right of blog page). To subscribe to Hoofcare and Lameness (the journal), please visit the main site, www.hoofcare.com, where many educational products and media related to equine lameness and hoof science can be found. Questions or problems with this blog? Send email to blog@hoofcare.com.

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Disclosure of Material Connection: I have not received any direct compensation for writing this post. I have no material connection to the brands, products, or services that I have mentioned, other than Hoofcare Publishing. I am disclosing this in accordance with the Federal Trade Commission’s 16 CFR, Part 255: Guides Concerning the Use of Endorsements and Testimonials in Advertising.

Saturday, July 28, 2012

Science of the Olympics: Sport Analysis Videos to Inspire Your Thoughts on Horses

Note: NBC Olympics videos have an annoying auto-play function so the videos have been moved off the blog. Please go to "Science of the Summer Olympics: Engineering In Sports", a 10-part video series produced in partnership with NBC Learn to view the videos described in this blog post.

Have you been staring at a television screen, immersed in the Olympics? Are you chewing your nails for the Swiss beach volleyball team or the Luxembourg table tennis team? Do you wonder if they ever really will get back to Greenwich Park and the equestrian events?

We get wrapped up in the competition of sports but the Olympics is a good time to remember that the same sport science that is used to advance horse sports and hoof science is also used on human athletes.

So whether you are Usain Bolt or Zenyatta, there's a professor at MIT who can dissect your stride. And the same terminology is used whether you're measuring the stride of a track star or a Thoroughbred.

How can we get BMW interested in horses? In order to maximize his performance in the decathalon, 2008 Olympic gold medalist Bryan Clay teamed up with engineers from BMW to improve measurement of the horizontal and vertical velocities of his long jumps.

Could the same long-jump technique be used to analyze how Kauto Star won the Cheltenham Gold Cup or how a rider like Meredith Michaels-Beerbaum's horse will clear the water jump at Greenwich Park this weekend?

While you're watching the Olympics, think about the fact that the emerging gait analysis and sport science we see used in horse sports is being applied to each and every one of those Olympic sports. In some aspects, horse sports have lead the way. In other aspects, horse sports have a lot of catching up to do.

So don't think for a minute that you're wasting time watching the Olympics. You're doing your homework, albeit on the subconscious level in many instances. Some creative thoughts about how horses move are sure to pop into your head a week or two from now, and you'll wonder where those thoughts originated.

Maybe you'll never see a horse on a balance beam, but when you think about the pressure to always improve the level of performance while not crossing the line to injury, you realize that all athletes have a lot in common, whether they're horse or human.

These two sample videos are part of "Science of the Summer Olympics: Engineering In Sports", a 10-part video series produced in partnership with NBC Learn. (You can watch them all online and if you're really interested or if you know a teacher who might be, there are lesson plans available to use these videos in the classroom. Just pretend the humans are horses.)

It's easy to order this colorful, award-winning image from Michigan State Equine Foot Lab

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Thursday, June 14, 2012

Tennessee Walking Horse Pastern Action Devices and Hoof Pads Ban Endorsed by AVMA, AAEP; Vets' Joint Memo States Devices Are Part of Soring Practices

Walking horse hoof packages include some or all of these components: (from ground up) 1. a shoe on the ground; 2. a stack of pads anchored by a double-nail pad system; 3. a hose clamp that secures the pad package around the hoof wall; 4. pastern action devices, usually chains or beads. The pastern and sole are the focus of soring methods to inflict pain so that the horse doesn't want to keep either front foot on the ground for long. The heavy pad-shoe combo exaggerates the flight of the foot through the air. In 1985, the USDA proposed to ban pads but the ban didn't last. (Hoofcare + Lameness file photo)

The following is a position statement received from the AVMA and AAEP today. Soring is prohibited under the Horse Protection Act, a federal law enforced by the US Department of Agriculture's Animal and Plant Health Inspection Service (USDA-APHIS)

June 14, 2012 - The American Veterinary Medical Association (AVMA) and the American Association of Equine Practitioners (AAEP) today called for a ban on the use of action devices and performance packages in the training and showing of Tennessee Walking Horses.

These devices and packages are implicated in the practice of soring, which is the abusive act of intentionally inflicting pain to accentuate a horse’s gait.

"Soring has been an illegal act for more than 40 years. Nevertheless, increasingly shrewd and more difficult to detect—yet equally painful—methods of soring continue to plague the Walking Horse Industry," said Dr. René A. Carlson, President of the AVMA.


Walking horse shows such as The Celebration in Shelbyville, Tennessee attract large, enthusiastic crowds. (Photo via Stephanie Graves.

"America's veterinarians are asking USDA-APHIS to prohibit the use of action devices and performance packages in the training and showing of Walking Horses, because they appear to be facilitating soring," Dr. Carlson added.

"The soring of Tennessee Walking Horses is an extremely abusive practice and it must end," said AAEP President Dr. John Mitchell. "We urge a modification to the Horse Protection Act so that all action devices and performance packages are banned."

Following is the veterinary groups' joint position statement:

The American Veterinary Medical Association and the American Association of Equine Practitioners support a ban on the use of action devices and performance packages in the training and showing of Tennessee Walking Horses.

A natural-type Walking horse without hoof buildup or
action devices. Image courtesy of eXtensionHorses
and Ashley Griffin, University of Kentucky

Action devices used in the training and showing of Tennessee Walking Horses include chains, ankle rings, collars, rollers, and bracelets of wood or aluminum beads. When used in conjunction with chemical irritants on the pastern of the horse’s foot, the motion of the action device creates a painful response, resulting in a more exaggerated gait.

Foreign substances are being detected on the pastern area during pre-show inspections at an alarmingly high rate, according to U.S. Department of Agriculture statistics. While there is little scientific evidence to indicate that the use of action devices below a certain weight are detrimental to the health and welfare of the horse, banning action devices from use in the training and showing of Tennessee Walking Horses reduces the motivation to apply a chemical irritant to the pastern.

The United States Equestrian Federation (USEF), the national governing body for equestrian sport in the United States, disallows action devices in the show ring for all recognized national breed affiliates. The AVMA and the AAEP commend the USEF for this rule and urge the USDA-APHIS to adopt similar restrictions for Tennessee Walking Horses.


The walking horse exaggerated walk has been popular for at least 50 years; this horse competed in the Walking Horse Celebration in the 1960s. Roy Rogers' famous horse Trigger was a Tennessee Walking Horse. (Hoofcare + Lameness archives)

Performance packages (also called stacks or pads), made of plastic, leather, wood, rubber and combinations of these materials, are attached below the sole of the horse’s natural hoof and have a metal band that runs around the hoof wall to maintain them in place.

Performance packages add weight to the horse’s foot, causing it to strike with more force and at an abnormal angle to the ground. They also facilitate the concealment of items that apply pressure to the sole of the horse’s hoof. Pressure from these hidden items produces pain in the hoof so that the horse lifts its feet faster and higher in an exaggerated gait.

Because the inhumane practice of soring Tennessee Walking Horses has continued 40 years after passage of the Horse Protection Act, and because the industry has been unable to make substantial progress in eliminating this abusive practice, the AVMA and the AAEP believe a ban on action devices and performance packages is necessary to protect the health and welfare of the horse.

--end of announcement

Hoof Blog note: It should be clarified that Walking horses are not governed by USEF rules. Other "action" breeds such as the American Saddlebred, Hackney, and National Show Horse are governed by USEF rules.

© Fran Jurga and Hoofcare Publishing; Fran Jurga's Hoof Blog is a between-issues news service for subscribers to Hoofcare and Lameness Journal. Please, no use without permission. You only need to ask. This blog may be read online at the blog page, checked via RSS feed, or received via a digest-type email (requires signup in box at top right of blog page). To subscribe to Hoofcare and Lameness (the journal), please visit the main site, www.hoofcare.com, where many educational products and media related to equine lameness and hoof science can be found. Questions or problems with this blog? Send email to blog@hoofcare.com.

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Sunday, February 12, 2012

Deformity in Motion: Neglected Hooves Respond in Ireland

Johnny and James are two otherwise anonymous donkeys in Ireland who have been lucky enough to be rescued and find some kind people at The Donkey Sanctuary there.

Horses and ponies and donkeys with overgrown hooves are not uncommon to find. We routinely see photos of them when they are rescued by agencies or brought to farriers and vets for care.

But Johnny and James are different because these are not still shots, these are videos. You can see not just how overgrown they are, but that these strong, adaptable donkeys can still get around. They've had to adapt their gait a bit, perhaps, but they're still on the move.

We are always taught that the hoof wall bears the horse's weight and that the weight is transferred down the bony column of the limb. But nature obviously has a plan B, so that the horse can transfer its weight to the heels.

Another thing we're taught is that the toe is the strongest part of the hoof and the heel is the weakest and most deformable. And yet in these donkeys and so many other neglected equines, the heels are standing up to the job. The foot doesn't collapse, the heels don't rupture.

The second video shows that Johnny began to recover once his feet were under him again. The sanctuary mentioned that the hooves were radiographed and that the trim would be fine-tuned over the weeks to come until his weightbearing and gait could be normalized.

The hoof has to be one of the most adaptive structures in nature, yet we always try to make it conform to our ideal--whatever that may be. Surely there is a sweet spot for every hoof, a place where that foot finds optimal function.

The trick is to find it, to find it before it is too late, and to keep the hoof shape and position under the limb within a range of that spot throughout the animal's life.

Visit The Donkey Sanctuary web site to learn more about the charity's work on behalf of donkeys in Ireland--and everywhere.

$176 + $11 P+H US only; ready to ship: Tel 978 281 3222, fax 978 283 8775, email: books@hoofcare.com

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Wednesday, August 10, 2011

Dogs in Motion: An X-Ray Video With a Cold Nose

Here's some eye candy for a summer's day: video x-rays of a dog...share this with your friends who love Dachshunds! Thanks to New Scientist for this video.

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Wednesday, January 26, 2011

Video: Equine Biomechanics Integrated with an Icelandic Horse's Disco-Rhythm Hoofbeats by Swiss Researchers

Are you awake now?

This video is your wake-up call. It's a fast-cut peek inside the high-tech equine performance testing laboratory at the University of Zurich in Switzerland, where kinematic- and kinetic-research are undergoing an exciting fusion under the direction of biomechanics research professor Michael Weishaupt PhD DMV. Where the disco beat came from is anyone's guess!

Are the researchers trying to turn this Icelandic into an Olympian or a racehorse? No, there are no Frankenhorses in biomechanics labs. "The application of knowledge pertaining to sports medicine does not aim to increase the speed of the horse or allow it to jump higher, but to keep the athlete sound, prepare it optimally for a specific event, and to recognize detrimental influences early in order to avoid an untimely end to an athletic career," wrote Dr Weishaupt along with Zurich's esteemed professor of equine surgery, Dr Jorg Auer, in an explanation of the research at Zurich.

To do that, Weishaupt and his colleagues are combining kinetic and kinematic research in the same evaluation system. Two formerly exclusive branches of biomechanics research are now under the hood of the same laboratory testing matrix.

Kinematics is nothing new to Hoofcare + Lameness readers. Kinematics is simply the study of motion. A student of dressage could be said to be an equine kinematics scholar, on some level. But in the world of clinical evaluation of horses, we have typically talked about kinematics as the two-dimensional recording of a horse's movement in order to gain insight into a horse's stride's length or velocity or frequency, or to determine lameness. It works very nicely to prove or enhance what we think we see with our naked eyes or what the rider thinks he or she feels from the saddle.

For the past five years or so, kinematics in the laboratory has been moving ahead. Three-dimensional gait analysis has been used in research to delve deeper into the horse's movement so that joints can be analyzed for the complex structures that many of them are. A hinge joint like the fetlock might be analyzed in two dimensions, but what about the hock or the spine? And what about the coffin joint, a complex structure with three types of motion patterns--flexion-extension, abduction-adduction and axial rotation?

And what if a specific location in the limb could be isolated, such as the distal end of the cannon bone, where so many racing injuries occur? If the forces there can be measured over different track surfaces, aren't we light years ahead in preventing breakdowns?

When studying the motion of the horse, it's not just about the legs. The neck and head and back are critical components so gait analysis has expanded to putting markers all over the horse. The angular motion patterns (flexion-extension, lateral bending and lateral excursion) of six vertebrae (T10, T13, T17, L1, L3 and L5) and the axial rotation of the pelvis are calculated by the software used in the research--in the case of our friends in Zurich, that would be the Qualisys system.

In this video, provided by Qualisys, researchers used a similar system at the University of Agricultural Science in Uppsala, Sweden; 12 cameras recorded the horse in three dimensions on a sensitized treadmill so that the movement of the head and neck could be studied with each footfall and with the movement of the rider. Notice that the horse's center of gravity is always clearly marked on the screen.

So now the leading research labs may use three or many more cameras and create almost realistic moving horses on computer screens. Wireless technology has also improved the operations in the equine research laboratory.

If kinematics is the study of motion, kinetics is its alter ego, the study of force. Kinematics might not care if you were a ballerina or a gorilla crossing a Broadway stage--you'd just be a pattern of dots for it to interpret. And kinetics wouldn't care how synchronous or straight your limbs worked as you crossed; kinetics would worry instead about what happened when your feet hit the stage. Did you slide? Did you hit with enough force to break through a board? How long did each foot stay on the floor?

Researchers explore kinetics with force plates and, more recently, the alternative of pressure-sensitive materials such as mats and walkways embedded with sensors. In Zurich's case, it is an instrumented (sensor-embedded) treadmill (photo, above), or "TiF": a "Treadmill-integrated Force" measuring system able to record the vertical ground reaction forces of all four limbs simultaneously and report it instantly.

The buzzwords of kinetics are ground reaction force and center of gravity. A foot in water finds little resistance, but a foot usually lands on somewhat solid ground, depending on the nature of the footing. If the surface was rigid and foot was a wine glass, it would shatter, but it's designed to deform and store energy when it meets the ground. How to measure what happens during that meeting is the goal of kinetic research.

So the scientists at the University of Zurich wanted to analyze how the Icelandic horse on the treadmill in the video is moving (kinematics) while intermittently impacting the ground (kinetics) with his hooves. One of the new advantages of hoof-related research is the integration of the kinetic and kinematic tools. As the video screen draws the dotted horse that the cameras see, the pressure sensors simultaneously are recording the data of the impact of each footfall. The integration of these systems is relatively recent.

But there is a third entity going on here. The addition of a saddle and rider will affect the kinematics of the horse and no doubt the kinetics as well. So the researchers are measuring the pressure and movement of the saddle. Last year the same lab studied dressage horses at the collected walk--a deceptively simple gait that is a challenge to many upper level horses--and measured how much and in what direction at what phase of the stride the saddle moved.

Believe it or not, little research on the walk had been done before, and in particular, no one had tested how the rider and saddle might affect the horse's score at the walk. Since racehorses tend to trot, pace or gallop for a living, you will find a deep history of studies on those gaits over the course of equine biomechanics history. Sport horse kinetics and kinematics is a far less investigated field of study.

In the Zurich tests, all the dressage horses' saddles moved in the same directions at the same phases of the strides, and the rider's movement was the same as well.

And what about the hooves? Labs like Zurich have conducted comparative studies of how a horse moves while unshod, shod normally, and shod with rolled toe or "four point" shoes to study the effects of shoeing changes on kinematics and kinetics--in particular, the timing of the phases of the stride. Does a particular shoe cause a horse to keep its foot on the ground longer than another, and might this be associated with an increased potential for injury?

So now the dressage horses have gone home and the Icelandic horses are being tested. A research project in progress is Kinetics, kinematics and energetics of the tölt: Effects of rider interaction and shoeing manipulations. The tölt is the amazing fast gait of the Icelandic horse; it is their signature show gait, and possibly unique to the breed. Will changing the shoes on an Icelandic horse change its ability to perform the tölt?

Since no one has studied an Icelandic horse with the resources that are available today, no one really knows.

But someone will. And, by extension, the world will know soon after that.

Thanks to BartMedia Designs for this video.

Here's a little video about using similar but more simplified equipment for testing humans. I hope this helps you understand biomechanics research a little better! The concepts mentioned in this blog post are vastly over-simplified but once you understand the basic concepts, it will all start to make sense.

To learn more: BYSTRÖM, A., RHODIN, M., Von PEINEN, K., WEISHAUPT, M. A. and ROEPSTORFF, L. (2010), Kinematics of saddle and rider in high-level dressage horses performing collected walk on a treadmill. Equine Veterinary Journal, 42: 340–345. doi: 10.1111/j.2042-3306.2010.00063.x

Anyone interested in learning more about equine biomechanics would be well-served by attending the Equinology biomechanics course with Dr. Hilary Clayton at the McPhail Equine Performance Center at Michigan State University's College of Veterinary Medicine in the fall of 2012. A combined course in biomechanics and lameness evaluation with Dr. Clayton will be offered in England in March 2011 at Writtle College.

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Thursday, June 17, 2010

Lameness Detection: Symmetrical Accelerometer Alignment Means Your Horse Is Sound

A sensor developed by scientists from the University of Copenhagen in Denmark may soon be able to help detect the earliest and most subtle signs of equine lameness; use of the device is hoped to enable veterinarians and trainers to intervene and remove a horse from training or competition before an injury can become worse, and to treat an injury while it is still in its early stages.

"An objective measure is needed because it's not always obvious visually, and even trained observers of horses can disagree when a horse is going lame," explains Maj Halling Thomsen of the Faculty of Life Sciences in Copenhagen, who has been involved with the research.

Thomsen and her colleagues use miniature accelerometers calculated in three dimensions. The accelerometers were originally developed for use in cellphones, where they are used to orient information displayed on the screen.

Thomsen's accelerometer devices are, according to New Scientist magazine, three piezoelectric cantilevers set at right angles to each other. Each one produces a voltage when it is compressed by forces due to acceleration or gravity, so the three together can detect forces in three dimensions.

"Just like humans, the gait of a horse changes when it starts to hurt. Unlike humans though, a horse's four legs make it hard to detect with the human eye. But when horses are about to go lame they start to move asymmetrically left-right as they trot. An accelerometer, mounted on the animal's back should be able to detect this," Maj Halling Thomsen explained in an article in the University Post.

She and her team have studied healthy horses, and now plan to conduct further tests on lame horses to see if deviations from the "symmetry indices" they have drawn up can help predict the onset of lameness. With the device attached to a surcingle on the horse's back, they will be expecting a change in vertical motion of the horse's body as it moves from left to right.

Sensoring technology is in demand from race and show jump trainers in Europe, with some studies for example trying to optimise the link between stride length and speed. In the United States, accelerometer-based gait technology has been centered at the University of Missouri College of Veterinary Medicine.

"But there where I see the most value for this sensor is as a support for practicing vets in diagnosing lameness," says Thomsen.

For more information, see "Symmetry indices based on accelerometric data in trotting horses" in
Journal of Biomechanics, by Maj Halling Thomsen, Anders Tolver Jensen, Helle Sørensen, Casper Lindegaard, and Pia Haubro Andersen

18 June 2010 | Fran Jurga's Hoof Blog at Hoofcare.com

Please, no use without permission. You only need to ask. Fran Jurga's Hoof Blog is a between-issues news service for subscribers to Hoofcare and Lameness Journal. This blog may be read online at the blog page, checked via RSS feed, or received via a digest-type email (requires signup in box at top right of blog page). To subscribe to Hoofcare and Lameness (the journal), please visit the main site, www.hoofcare.com, where many educational products and media related to equine lameness and hoof science can be found. Questions or problems with this blog? Send email to blog@hoofcare.com.

Saturday, April 03, 2010

Dr Hilary Clayton's 2010 Equinology Biomechanics and Gait Analysis Class: April 5 Deadline!

3 April 2010 | Fran Jurga's Hoof Blog at Hoofcare.com

The McPhail Center at Michigan State is one of the world's few research centers dedicated to researching the science of equine performance--from the ground up. Any number of research projects on aspects of equine movement, conformation or sport performance may be simultaneously underway under the direction of Dr. Hilary Clayton.

It's 30 days and counting until it is time to join us at Michigan State University for the special four-day course in equine biomechanics and lameness at Michigan State University’s College of Veterinary Medicine’s Mary Anne McPhail Equine Performance Center, presented by Dr. Hilary Clayton. The course is offered through the Equinology study program.

But the deadline to let Equinology know you want to attend is NOW.

“This is a rare opportunity to see the McPhail Center from the inside,” Dr. Clayton told me last week. “One of the things people might not expect is that we’ll be working on neck and back dissections, and looking at some pathologies.

For 3-D motion analysis, horses' joints must be palpated and markers applied to the centers of joint rotation. A marker out of place can ruin a lengthy evaluation session.

“For the most part," she continued, "the students will have the chance to perfect their palpation skills, and to learn how to place markers in the centers of joint rotation. Using our equipment, a student will be able to see the effects of placing the marker in the wrong place, versus the right place, and the effect it can have on evaluating a horse.”

In addition to covering biomechanics, conformation, and gait analysis in a classroom format, students will be privy to summaries of current research from around the world, as well as from the McPhail lab.

Built-in force plates in the McPhail Center's arena can be used to determine loading and landing patterns and the location of the center of pressure on horses standing in place (or piaffing in place) or worked on a circle.

Of special interest is the Center’s new coordinated system of six force plates. They are positioned for working horses within an arena, under the footing, in a circle or for standing the horse, so that one foot is on each force plate. “We use this system in research; a recent study tested posture and balance in foals,” Dr Clayton remarked.

Another research project in progress at the McPhail Center is evaluating the use of side reins on horses: how do they affect the horse’s center of mass, particularly in different sizes and types of horses?

Students will also learn about a special saddle developed and tested through the McPhail Center for use in therapeutic riding.

Many hoof blog readers will be interested in Dr Clayton’s research on what is called simply “barefoot trimming” at Michigan State. Dr. Clayton’s recent study tracked the changes in feet maintained using a simply set of parameters; her documentation found that as the heels were consistently lowered, they did migrate caudally and that the palmar (or plantar) angle of the coffin bone increased proportionately.

One of Equinology's superb "illustrated horses", courtesy of Debranne Pattillo

Dr. Clayton's research center equipment includes a motion analysis system, AMTI force plate, Noraxon EMG system, Pliance saddle pressure pad and other custom equipment for making measurements of horses and riders. This course will help sharpen your eye for irregularities, asymmetries and gait abnormalities through a variety of formats utilized in today’s industry. Your own visual appreciation of horse movement and your acumen for sensing abnormalities will be supported--and tested--by equipment used in the lab.

For more information on research projects at the McPhail Center, please click here.

Class Outline: Gait analysis and evaluation guideline, utilizing the data from the research equipment in the real world, conformation evaluation, locating palpation points for segment and angle measurements, analysis of conformation, anatomy and terminology, history of biomechanics, biomechanical techniques, equipometry discussion.

About Dr Clayton: Hilary Clayton BVMS, PhD, MRCVS has been the Mary Anne McPhail Dressage Chair in Equine Sports Medicine at Michigan State University's College of Veterinary Medicine since July, 1997. As a veterinarian and researcher, Dr. Clayton's studies on the biomechanics of equine gait have focused on sport horses, including dressage and jumping horses. Some recent work has included videographic studies of Olympic dressage and jumping events and kinematic and kinetic research with some of the world's top dressage riders and horses in the Netherlands. She is also the author of The Dynamic Horse and Conditioning Sport Horses and co-author of Activate Your Horse’s Core, Equine Locomotion and Clinical Anatomy of the Horse. Dr. Clayton needs no introduction when “biomechanics” is mentioned; she is one of the leading international specialists in the subject, particularly in the anatomy and function of the equine hoof and limb.

Fees: The cost of the course is $995 (about $250 per day) and that fee includes course handouts and supplies. A $200 deposit is required to enroll.

An additional weekend course in equine lameness with Dr Barb Crabbe is being offered for the days immediately preceding the four-day course.

For full course details, please visit the Equinology website and click onto EQ300 or cut and paste this address: http://www.equinology.com/info/course.asp?courseid=12 (Dr. Clayton) and the EQ600 details can be found at: http://www.equinology.com/info/course.asp?courseid=78 (Dr. Crabbe).

Join your Hoofcare & Lameness/Hoof Blog editor in this very special class. It could be the most important thing you do to jump-start your career in the direction of the future of equine lameness and hoof science. Get a head start: find out where this world of ours is going. See you there!

© Fran Jurga and Hoofcare Publishing. Please, no use without permission. You only need to ask.

Fran Jurga's Hoof Blog is a between-issues news service for subscribers to Hoofcare and Lameness Journal. This blog may be read online at the blog page, checked via RSS feed, or received via a digest-type email (requires signup in box at top right of blog page).

To subscribe to Hoofcare and Lameness (the journal), please visit the main site, www.hoofcare.com, where many educational products and media related to equine lameness and hoof science can be found.

Questions or problems with this blog? Send email to blog@hoofcare.com.

Monday, November 30, 2009

Equine Gait Analysis Has a Secondary Benefit: Upgrading Video Game Quality

by Fran Jurga | 30 November 2009 | Fran Jurga's Hoof Blog

Sometimes I see people shake their heads after a lecture on the wonders of video-based gait analysis of horses. They just don't get it. And admittedly, the lectures can be boring, although Mark Aikens certainly showed how interesting and practical it can be when he spoke at Cornell University's farrier conference two weeks ago. (More information is coming on that presentation!)

But did you know that roughly the same process used to identify gait abnormalities in a clinical setting is used to collect data points of horses for animation? Today's video takes you to a makeshift video studio on a riding arena in England, where a video crew is "filming" a white horse that will later star in a video game.

Here's a rough cut of what the animators were able to re-create from the data points. So the next time you waste an hour playing Oblivion, just ask yourself where that horse got his moves. His moves might just be data points, plucked out of a riding arena by a geeky animation crew that could moonlight at an equine hospital, if they were so inclined.

© Fran Jurga and Hoofcare Publishing. No use without permission. You only need to ask. Fran Jurga's Hoof Blog is a between-issues news service for subscribers to Hoofcare and Lameness Journal. This blog may be read online at the blog page, checked via RSS feed, or received via a digest-type email (requires signup in box at top right of blog page). To subscribe to Hoofcare and Lameness (the journal), please visit the main site, www.hoofcare.com, where many educational products and media related to equine lameness and hoof science can be found. Questions or problems with this blog? Send email to blog@hoofcare.com.

Wednesday, October 28, 2009

From Sim to Mo-Cap to Slo-Mo: Have Another Look at the Horse in Motion

by Fran Jurga | 28 October 2009 | Fran Jurga's Hoof Blog

Today I hurt my eye and it made the world a different place. Depth perception was different, some things don't quite line up, and this computer screen is a little blurry so this post will be a media-rich one. I'll let the videos tell the story.

And the story is exactly what I have been experiencing: how do we look at things? You read research reports and case studies and observations on this blog all the time, but they are from the viewpoints of different original sources. Here are some examples of the sources the Hoof Blog uses.

This is a computer-generated leg model from the University of California at Davis. The model lives in a perfect world. Someone designed a limb with arbitrary (or perhaps intentional) conformation and measured the resulting tendon, ligament and muscle forces if this ideal limb was moving over a perfectly smooth, non-deforming surface.

This is what we now call "traditional" two-dimensional video analysis, often used for before-and-after shoeing and trimming evaluation.

This very brief clip is 3-D analysis. You might want to use the play button to start and stop it and see more detail.

Finally, here's high-speed video, or what you might call high-quality slow motion. This polo pony is exhibiting the same stride characteristic as the computer model at the top but wow! he is influenced by the weight and lean of his rider and the variable deformability of the field as well as, no doubt, probably some conformational traits that offset his limb alignment. This is the real world.

There are plenty of other ways to capture horses and model their movement to study and analyze them; the idea here is that when you read an article, the authors may be extrapolating data from a computer model or from subjective observation with no data collection. You have to read the fine print and always take into consideration how a study was conducted and how many horses were in a study.

Does the moving horse interest you? Cornell University will host a veritable festival of motion capture, slo-mo and gait analysis at the 26th Farriers Conference November 14-15 in Ithaca, New York at the College of Veterinary Medicine. The early registration deadline is Friday so get organized and save $50 over the on-site fees.

Speakers at Cornell include farriers Scott Lampert of OnTrack Equine in Minnesota and Mark Aikens from Anglia Equine in England, both of whom are leaders in using videography in analyzing how shoeing and trimming effect horses' movement. Dr. Jeremy Rawlinson of Cornell will demonstrate the use of Cornell's force plate system and de-mystify the concept of ground reaction forces.

Hoofcare & Lameness is thrilled to be a part of this event. For a full schedule and list of speakers, and to register online, click here or go directly to http://www.vet.cornell.edu/education/conferences/farriers/

© Fran Jurga and Hoofcare Publishing. No use without permission. You only need to ask.

Fran Jurga's Hoof Blog is a between-issues news service for subscribers to Hoofcare and Lameness Journal. This blog may be read online at the blog page, checked via RSS feed, or received via a digest-type email (requires signup in box at top right of blog page).

To subscribe to Hoofcare and Lameness (the journal), please visit the main site, www.hoofcare.com, where many educational products and media related to equine lameness and hoof science can be found.

Questions or problems with this blog? Send email to blog@hoofcare.com.

Thursday, July 30, 2009

Applied Anatomy: The Painted Horses as Teachers

by Fran Jurga | 30 July 2009 | Fran Jurga's Hoof Blog

How did we teach (and learn) anatomy before we had super-markers to paint directly on horses' bodies? I believe that this clever technique was popularized by American clinician Susan Harris in the 1990s, or at least she was the first to make an educational project out of horse-painting.

We've seen an expansion lately, in the art of painting on horses. Dr. Gerd Heuschmann uses the horse as a canvas in his terrific video, If Horses Could Speak, and there's a beautiful new book on the Hoofcare & Lameness list (ordering info below) called How Your Horse Moves that documents painted horses going through gaits and stretches.

The problem, of course, is that you can only suggest the surface structures, and so much lies beneath. And should you choose the skeleton or the muscles?

Nicole Rossa solved that problem by painting the muscles on one side and the bones and joints on the other. Nicole is an equine therapist in England who has written some interesting papers, most notably one on asymmetry of the pelvis in racehorses and the effect on performance. Now she has teamed up with horse insurance company PetPlan and is consultant to the most ambitious web site project in the horse health world, Yourstables.co.uk.

On second thought, don't click on that link. Yourstables.com is a distraction demon. It's an absolute vortex where hours can pass while you wander around inspecting the minute textures of the stable mats and what it says on the plaques of the walls in the office. You'll emerge hours later, blinking.

Yourstables is a setup for teaching horsecare through consulting professionals, with the guidance of eventing legend Lucinda Green as an avatar. A 3-D horse barn (British style) is equipped with the newest and best of everything. You mouse over items and navigate through videos and printable articles explaining everything from grooming to diseases. It's quite good and Nicole Rossa is the consulting therapist. This list video is an out-take from a video made for the web site.

Back to the painted ponies: I just have one question. Why stop with horses? Do dog health educators paint anatomy markers on greyhounds? Who wants to volunteer their Jack Russell or maybe a Pug to be anatomically decorated? Nicole Rossa might find some work on humans when Halloween comes around.

Heads up: How Your Horse Moves by Gillian Higgins can be ordered now. Super reference on anatomy, gaits, biomechanics, jumping, tendon function, back function, etc. All full color photography; most of the horses are anatomically enhanced and very nicely photographed. The cover does not do this book justice. Hardcover, 153 pages, indexed, 350 color photos. Intro by Chris Bartle and Bettina Hoy. I expect I will be seeing a lot of the photos in this book in other people's PowerPoints soon! The good news: $30 per book plus $6 per book post in USA, $13 per book elsewhere. To order call 978 281 3222 or email books@hoofcare.com.

NOTE: Gillian Higgins will be on the program at a conference with Dr Hilary Clayton February 13-14, 2010 in Grantham in Great Britain.

© Fran Jurga and Hoofcare Publishing. No use without permission. You only need to ask.

Fran Jurga's Hoof Blog is a between-issues news service for subscribers to Hoofcare and Lameness Journal. This blog may be read online at the blog page, checked via RSS feed, or received via a digest-type email (requires signup in box at top right of blog page).

To subscribe to Hoofcare and Lameness (the journal), please visit the main site, www.hoofcare.com, where many educational products and media related to equine lameness and hoof science can be found.

Questions or problems with this blog? Send email to blog@hoofcare.com.

Sunday, July 12, 2009

Favorite Sunday Video: Elephant Gait Analysis

by Fran Jurga | 12 July 2009 | Fran Jurga's Hoof Blog

It has been reported here, and published in scientific journals, that elephants have limited gaits. Research tells us that they can't run, or even trot, and they can only accelerate their walk, according to research conducted at the Motion and Structure Laboratory at the Royal College of Veterinary Medicine in England.

"Poor elephants," I always thought. Stuck in a four-beat walk their entire lives.

But I think those researchers should take a look at this video. It never fails to make me smile...and to want to go for a swim.

Maybe elephants have some secrets that they keep to themselves. If this is a four-beat gait, it's done with such obvious enjoyment.

Question: when horses swim, do they move their limbs independently (four beats) or in diagonal or lateral pairs (like a trot or pace)? Just curious...

Elephant lovers: Click here for another favorite video, the elephant on a trampoline. Elephants have all the fun!

Monday, April 13, 2009

Mo-Cap Video Treat: Horse and Rider in Motion, Video-Captured and Computer-Recreated

by Fran Jurga | 13 April 2009 | Fran Jurga's Hoof Blog

This little clip is titled A Biomechanical Analysis of Relationship Between the Head and Neck Position, Vertebral Column and Limbs in the Horse at Walk and Trot and is from the Department of Veterinary Medicine and Animal Science, at the Swedish University of Agricultural Science in Uppsala, Sweden. Thanks to researcher Marie Rhodin for sharing this little snapshot of what goes on at Uppsala.

Dr. Rhodin writes: "Reflective markers were glued onto the skin above anatomical structures defined through palpation. A high speed 3D infrared camera system (ProReflex) was used to capture data. Twelve cameras were used and a treadmill instrumented with a force measuring system was used for simultaneous, synchronized force measurements. Qualisys software was used for the motion analysis."

Dr. Rhodin's name is one that is seen quite often lately on the rosters of world-class equine biomechanics research. She was involved with two presentations at last year's International Conference on Equine Locomotion (ICEL6) in France. Working with our friend at Uppsala, Dr. Christopher Johnston, and Lars Roepstorff and Anna Byström, and collaborating with researcher Dr. Michael Weishaupt at the University of Zurich and Dr. René van Weeren at the University of Utrecht in Holland, Dr. Rhodin's team collected data on the motion of horses when the rider is in the sitting vs rising (posting) trot, and also compared the motion of the horse on each lead.

What you are seeing in this little video clip is the new generation of motion capture gait analysis--the rider gets analyzed along with the horse! The clip begins with the "real" video of the markered horse and rider; you then see the dots that the infrared cameras would "see" and translate into data. The data is then crunched and re-configured into an accurate animation of the horse and rider in skeletal form so that the movement of the bones and joints can be analyzed. This is a huge advance, since the horse is an asymmetric form and needs to be seen from all angles to get a true picture of movement. (And this is a vast over-simplification of the process.)

Through this type of motion capture, researchers can compare the effects of different equipment (Uppsala recently studied the effect of weighted boots on the movement of the back), different riders, and (one day), different surfaces. Being able to accurately record both the rider and the horse are rocketing equestrian sport science ahead. These are exciting times.

Many thanks to Dr. Rhodin and her research team at Uppsala and beyond for making the video clip available to Hoof Blog readers.