Patella or kneecap
The patella, or kneecap, is one of three bones, along with the tibia (shin bone) and femur (thigh bone), that make up the knee joint. All of these bones are covered with a layer of cartilage at points where their surfaces come into contact. Furthermore, the patella is wrapped up inside a tendon. This tendon connects the quadriceps muscle of the thigh to the shin bone (tibia) below the knee joint.
Injures can happen in young boisterous puppys as they jump around, according to our vet it is a very common injury in pups of all breeds.
The Bone has to be pinned back in place.
These are Picture of Darla one of my Puppy bitches at 4 months old
Below is the left and right legs as they are now after the opp
Below is a picture of her Left leg that was normal and the injuried Right leg