a calcium build-up that can occur either on the back of the heel, where the Achilles tendon attaches, or on the bottom of the heel that is closer to the ground where the plantar fascial ligament originates from the heel bone
A heel spur is a bony overgrowth on the bottom of the heel bone. The heel spur is often the result of an inflamed ligament (the plantar fascia) on the underside of the foot that attaches to the heel bone. Constant pulling of this ligament irritates the heel bone and the body creates a bone spur as a protective mechanism.
A hard bony shelf as wide as the width of the heelbone caused by repeated pulling away of periosteum from the heelbone (calcaneous). The repeated stress or injury causes inflammation and calcification of tendons and ligaments in the foot.