The major teaching points of the exhibit are:
The calcanues is made up of six trabecular patterns which form a lattice structure to support axial loading.
The Neutral Zone of the calcaneus is an inherent weak point due to sparse trabeculation.
Calcaneal fractures run along the planes of the trabecula, causing cleavage in predictable patterns that correlate to the Sander's Classification scheme.
Insufficiency fractures can deviate from the normal cleavage plains due to weakening of the trabecular patterns via microfractures.
Calcaneal Anatomy
Calcaneal Trabecula Orientation
Neutral Zone Anatomy
Mechanism of Injury
Sander's Classification in Relation to Trabecular Patterns
Insufficiency Fractures
Young, D,
Smitaman, E,
Calcaneal Cleavage Planes: Trabecular Lattice of the Calcaneus in Relation to Fracture Patterns . Radiological Society of North America 2014 Scientific Assembly and Annual Meeting, - ,Chicago IL.
http://archive.rsna.org/2014/14000329.html