Screw placement relative to the calcaneal fracture constant fragment: an anatomic study.

Placement of a screw from the lateral wall of the calcaneus into the constant sustentaculum tali fragment can be difficult when surgically repairing a calcaneal fracture. This screw serves to compress the fracture fragments and support the posterior facet. This difficulty results from the small landing zone of the sustentaculum tali with its nearby vulnerable soft tissue structures. We present an anatomic study of 10 cadavers to determine a starting point and angle of screw advancement when placing a constant fragment screw.