Small bone chip shadow on the upper edge of the heel bone usually refers to fractures, or local ligaments, tendons, muscles and other tissues subjected to long-term chronic strain, resulting in the appearance of calcified foci. 1. Calcification: usually refers to the starting and ending points of muscles, ligaments, fascia and other tissues are subjected to long-term strain, resulting in their making their elasticity, hardening of calcium salt deposits and calcification, which causes the phenomenon of small bone fragments on the upper edge of the heel bone. 2. Avulsion fracture: It may be due to the avulsion fracture, resulting in the attachment of tendon and ligament, fracture, resulting in the phenomenon of small bone fragments on the upper edge of the heel bone. If the phenomenon of small bone fragments on the upper edge of the heel bone occurs, it is necessary to consult a doctor in time, so as to avoid the delay of the condition and the adverse consequences.