It is characterized by progressive damage to the joint cartilage — the cushioning material at
the end of long bones — and causes changes in the structures around the joint.
The cartilage found at
the ends of long bones and between the spinal discs contains high percentage of water, which serves as a lubricant during the movement of the joint.
As normal growth occurs the cartilage on
the end of long bones (humerus, femur) must ossify / calcify or turn into bone.
Puppies Are Soft Core In addition to having soft growth plates at
the end of long bones, a puppy's bones in general are «softer.»
Growth plates are soft areas that sit at
the ends of the long bones in puppies and young dogs.
In a developing puppy, ossification of the bone growth plates begins in the center and at
each end of long bone.
This is often the result of the gradual degeneration of the tissues that make up
the ends of long bones such as those in the hips, legs, and even digits.
In particular, a Rottweiler puppy's «growth plates,» soft areas of developing cartilage found by
the ends of the long bones growth plates, are vulnerable to injuries.
They tend to form at the growth plates near
the ends of the long bones of the legs.
Endochondral ossification is the process by which cartilage on
the ends of long bones (e.g., humerus, femur) ossifies, or changes to bone.
Epiphyseal fractures usually occur at
the end of the long bones (femur, humerus) in puppies and young dogs.