Rarely, it can be caused by some form of blunt trauma, but most frequently, it is a developmental, congenital defect. In congenital cases, it is frequently bilateral. The condition can also be inherited through genetics. This can also be caused by obesity.
Luxating patella
Bipartite patella
Attenuated patella alta
Tarsal coalition
Retrocalcaneal bursitis
Sprained ankle
Bimalleolar fracture
Calcaneal spur