Avulsion fractures of the calcaneal tuberosity are usually caused by sudden muscular contraction of the Achilles tendon. Watch this video to learn more about the types and treatments of these fractures. 0:16 Calcaneal Avulsion fracture 1:10 Types of an avulsion fracture 1:30 Type I 2:22 Type II 2:56 Type III 3:20 Treatment