![]() ![]() Shown in blue is the area of the humerus which is affected by OCD. This presents major difficulties in diagnosis ( see also Treatment below). Looking at the x-ray picture, you can see that the medial coronoid process is in fact, particularly difficult to see. The anconeal process is not visible on this view, but its location is indicated on the x-ray picture. On the diagram, coloured yellow, you can see the coronoid process, which is a small bony prominence on the ulna. The inside of the dog, which we call “medial” is on the right, the outside, which we call “lateral” is on the left. You can see how the ulna, (the long bone of the lower foreleg), overlies the humerus, (the bone of the upper foreleg). In the first of these pictures, we are looking forwards at the elbow joint from the back. The locations of these problems are illustrated in the following pictures. Of these, fragmented medial coronoid process is the most common. Osteochondritis Dissecans of the Medial Humeral Condyle, (seen in the Labrador, Golden Retriever and occasionally the Rottweiler).Bernard, and only rarely in other breeds). Ununited Anconeal Process, (seen in GSD, Basset Hound, St.Fragmented Medial Coronoid Process, (seen in all large breeds, but especially Retrievers, Labradors, Rottweilers, Bernese Mountain Dogs).There are three types of osteochondrosis of the elbow, which together form a syndrome which we call: “Elbow Dysplasia.” the most common form of osteochondrosis occurs in the elbow joint. This is known as osteochondritis dissecans (OCD). This can shear, resulting in the formation of a flap. If the problem occurs at the joint surface, then a thickened area of cartilage develops which is only loosely attached to the underlying bone. If the problem occurs at the epiphyseal plate, then the overlying bone will not join properly to the main shaft of the bone. There are two main forms of osteochondrosis. You can see these areas of growth on this picture: Secondly, the cartilage which overlies the end of the bone, at the joint, also grows, and becomes ossified at the junction of bone and cartilage. This is a cartilaginous region of the growing bone, the location of the greatest part of growth. It resembles, but is distinct from hip dysplasia in many respects, in that it too is a developmental disorder of cartilage-bone formation. Osteochondrosis is an abnormality in this normal development of bones, and generally affects the joints. Bones grow by initially forming a cartilage template, onto which calcium is deposited to form bone, (this process is called “ossification”, and when the cartilage has been turned into bone it is “ossified”). To understand what’s going on in osteochondrosis, you need to understand a bit about how bones grow. ![]()
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