Haglund disease

Haglund's syndrome is a group of signs and symptoms consisting of Haglund's deformity (which is an exostosis of the posterior calcaneal tuberosity) in combination with retrocalcaneal bursitis. It is often accompanied by Achilles tendinitis.Haglund's deformity typically presents with a prominent bump on the upper posterior calcaneus. [Source: Wikipedia ]

Osteonecrosis of os tibiale externum
Is A
Site-specific avascular necrosis