Patients with less severe congenital patellar ectasia generally have little effect, while severe cases can cause patellar dislocation, walking abnormalities, premature joint aging, and so on. 1. Patellar dislocation: patients with congenital patellar luxation may have atrophy of quadriceps muscle, which may easily cause patellar dislocation, especially after the patient is injured, it is more likely to cause dislocation. 2. Walking abnormality: patients with severe congenital patellar luxation may cause patellofemoral joint development abnormality, resulting in walking abnormality. 3. Premature aging of joints: Due to congenital patellar displacement, the force between bone joints changes, which will cause serious wear and tear of joints, resulting in premature aging symptoms. In addition to the above, congenital patellar luxation will also cause leg pain and decrease in quality of life, and even affect normal life and work. Therefore, if diagnosed with the above mentioned diseases, it is recommended to have regular treatment as early as possible under the guidance of doctors.