How is the displacement of patella caused in dogs?

Patella dislocation in dogs is a kind of joint dislocation, which is caused by mechanical external force or pathological action, and then dislocation occurs. It is usually congenital, and the clinical manifestation of the disease is that the arched legs and knees cannot stretch. If the dog is found to have this symptom, it is best to take it to the hospital for detailed examination and surgical treatment.