Torus fracture

Torus fracture is an incomplete fracture of the shaft of a long bone that is characterized by buckling or bulging of the cortex. Usually seen in children, frequently in the distal radius diaphysis or metaphysis. Result from a longitudinal force being applied down the long axis of a bone Term is derived from the architectural word torus used to describe the convex projecting molding used at the base of a column.

Example of a distal radial torus fracture.
(Images courtesy of RadsWiki)