HAGLUND’S deformity is a bony enlargement on the back of the heel that most often leads to painful bursitis, which is an inflammation of the bursa (a fluid-filled sac between the tendon and bone).

This frustrating injury is more likely to occur in high-arched, inflexible runners, particularly if they possess a Haglund’s deformity. Until recently, researchers believed the biomechanical ...