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However, affected limbs may show lameness or joint swelling, resulting in limps of varying degree to the animal. [ 6 ] Radiographs can be used to assess the location of the deviation, the degree of deviation from normal, the condition of the bones within the affected joint, the appearance of the growth plates, and response to treatment over time.
A varus deformity is an excessive inward angulation (medial angulation, that is, towards the body's midline) of the distal segment of a bone or joint. The opposite of varus is called valgus . The terms varus and valgus always refer to the direction that the distal segment of the joint points.
On projectional radiography, the degree of varus or valgus deformity can be quantified by the hip-knee-ankle angle, [7] which is an angle between the femoral mechanical axis and the center of the ankle joint. [8] It is normally between 1.0° and 1.5° of varus in adults. [9] Normal ranges are different in children. [10]
Additionally, horses with a hind limb lameness will tend to reduce the degree of leg use. To do so, some horses will reduce the contraction time of the gluteals on the side of the lame leg, leading to a "hip roll" or "hip dip" and appearance that the hip drops a greater degree on the side of the lame leg.
The degree of these effects in horses after intramuscular injection has relatively little support in the current literature. [35] However, there is much anecdotal evidence of their benefits for synovitis and osteoarthritis, and PSGAGs are very commonly used by veterinarians in the United States involved in racehorse and show horse practice. [ 36 ]
But it is desirable for a horse to have a square to slightly pear shaped rump. A horse can have a relatively flat croup and a well-angled hip. Racehorses do well with hip angles of 20–30 degrees, trotting horses with 35 degrees. Once a horse is developed, the croup should be approximately the same height as the withers.
Equine polysaccharide storage myopathy (EPSM, PSSM, EPSSM) is a hereditary glycogen storage disease of horses that causes exertional rhabdomyolysis.It is currently known to affect the following breeds American Quarter Horses, American Paint Horses, Warmbloods, Cobs, Dales Ponies, Thoroughbreds, Arabians, New Forest ponies, and a large number of Heavy horse breeds.
Coxa vara is a deformity of the hip, whereby the angle between the head and the shaft of the femur is reduced to less than 120 degrees. This results in the leg being shortened and the development of a limp. It may be congenital and is commonly caused by injury, such as a fracture.