EQUINE | International News
EQUINE | International News
3
The mechanism responsible for the effect of surfaces on musculoskeletal disease is well established . The skeleton of the horse adapts to the dynamic loading of the bone . To minimize excess structure and to provide sufficient bone in highly loaded regions , bone is absorbed and deposited . The remodeling process produces a skeleton that is adapted to the training of the horse . Building the optimal skeleton requires that the horse performs the specified task during training . The type of loading during training should match the expected loading during competition . However , the maximum performance may not be desirable during training ; for example , the training distance may be shorter or the jumps lower . The overall loading directions should match that expected in competition and depends not only on activity but also on the manner in which the surface supports the horizontal and vertical loading by the horse .
Both the load rate and the magnitude of loading is critical to bone remodeling and the risk of fracture . Surfaces must also provide appropriate footing during all phases of the gait . Consider the initial loading on the leading foreleg of a horse at a gallop to illustrate the demands . During the initial impact of the hoof the loads are low , but the impact of the hoof on the surface occurs at a high speed . The loading , or firmness of the surface , primarily affects the peripheral bones in the leg . The smaller bones that have adapted to maximize the efficiency of the horse are quite susceptible to damage . During the secondary loading , the dynamic weight of the horse is transferred to the leg and long bones of the horse are then loaded . The cushioning of the surface reduces the rate of loading of the bones and the risk to the more proximal bones of the leg . While more research is needed , it is likely that both the training and competition surface should have optimal cushioning and firmness to ensure proper development of the skeleton while reducing the risk of injury . In addition to these two factors , cushioning and firmness , three additional characteristics have been developed to characterize the surface response for equestrian competitions , namely responsiveness , grip , and uniformity .
To minimize risk during competition and to support required bone development in training , further research is needed to better understand the effects of surfaces on performance and injuries of the athletic horse . In the interim , the current state of knowledge has been reviewed in white papers for racing and equestrian sports . Improved processes for the testing and approval of surfaces such as those under development by the International Federation for Equestrian Sports ( FEI ) show great promise for implementing current knowledge in a way that best protects both horse and rider . Improvements in surfaces along with many other industry efforts have led to some of the recent reductions in catastrophic injuries in race horses , a critical effort for the protection of the racing industry as well as all equestrian sports .
CONTACT : Michael “ Mick ” Peterson , PhD mick . peterson @ uky . edu ( 207 ) 409-6872 University of Kentucky Lexington , KY
NATIONAL Diagnostic Approach to Equine Neurological Diseases
any diseases can affect the central nervous
Msystem of horses but four of the most common disorders are cervical vertebral stenotic myelopathy ( CSM ), equine protozoal myeloencephalitis ( EPM ), equine degenerative myeloencephalopathy ( EDM ), and equine herpesvirus 1 myeloencephalopathy ( EHM ).
Regardless of the cause , diagnostic evaluation begins with a neurological examination , which provides anatomic localization of the problem within the central nervous system . Then the diagnostic investigation continues with more focused testing .
If CSM is strongly suspected , radiographs of the neck should be taken . Narrowing of the cervical vertebral canal in combination with malformation of the cervical vertebrae results in compression of the spinal cord in CSM patients . Standing lateral radiographs of the cervical vertebrae often reveal bony malformations and probable narrowing of the vertebral canal . Myelography is an important antemortem diagnostic tool and is essential prior
32 • Equine Health Update •