Osteochondritis Dissecans
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Yet another of the many arthritic conditions that can disable your dog is one known as OCD, which stands for either osteochondritis dissecans or osteochondrosis dissecans. OCD is a disease that affects the cartilage - the spongy tissue that cushions the space between joints and allows them to work smoothly together.
Anything that damages or erodes this cartilage can lead to arthritis, resulting in joint pain, swelling and lameness. In the case of OCD, the cartilage is either damaged or grows abnormally. Instead of remaining attached to the bone that it's cushioning, the cartilage either separates or develops cracks. Sometimes pieces of cartilage will break off and float freely within the joint itself, where they continue to grow. All three of these problems cause extreme pain for the affected animal. [...]
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OCD is a degenerative bone disease that is found in many types of animals, including horses. Osteochondritis dissecans or OCD is most commonly associated with younger horses that are rapidly growing and developing, and is also typically associated with horses that have longer leg bones. Longer leg bones means taller horses, so usually breeds that have a mature height of over 15 hands are more prone to OCD but it can also be seen occasionally in smaller and shorter horses. Interesting there seems to be no difference between the tall heavy horses and the tall lighter horses, so weight itself is not the key factor, it is the length of the bones.
In normal growing horses the ends of the bones that meet up at the joints are soft and this is where the growth occurs. As the cartilage becomes hard it adds to the length of the bone, resulting in growth. In horses with OCD the softer, growing ends of the bone do not harden, rather they stay soft and actually begin to break down, resulting in pain, swelling and lameness that may seem initially to move throughout the limbs. [...]
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Osteochondritis Dissecans
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