An abnormal prominence of the posterior superior lateral aspect of the os calcis, caused by a gait disorder. It is probably formed by the rolling of the heel into the heel counter, or rim of the shoe. It is common in individuals who wear shoes that have a rigid heel counter such as ice skates or pump heels. As a result of the constant pressure of the shoe, reactive bone forms. Another reaction to the enlargement of the heel bone, is often bursitis of the heel. This is entered as Haglund’s syndrome II.