**Acknowledgements**

The authors would like to thank Lauren Domingue, for the drawings of the Anatomic Landmarks of the Calcaneus, Beavis fracture classification, and Sanders fracture classification. The authors would like to thank Mark Hetzer and Isabelle Annaheim from Synthes GmbH, Oberdorf, Switzerland, for the drawings of the Regazzoni [31] fracture classification. The authors would also like to thank Synthes for providing the external fixator equipment and sawbones used in demonstrations.
