If a person has a fractured calcaneus what are the neurologicalt effects?

Varies. A calcareous fracture can potentially not have any neurological issues at all. The two main ways s calcareous fracture can have neurological issues is if the fracture displaces and pushes on a nerve, or if the degree of swelling associated with the fracture causes nerve damage, such as in a compartment syndrome if the foot.
Heel fracture. A fracture of the foot and ankle can lead to nerve impingement. A foot and ankle expert can establish a diagnosis of nerve impingement and a nerve conduction test cam confirm the diagnosis.