"The term torus is the Latin word meaning protuberance. A torus is the convex portion of the upper part of the base of a Greek column and resembles the appearance of the cortical buckling seen in the "column" of bone which has been fractured in the pattern discussed in this article."
"Cortical buckle fractures occur when there is axial loading of a long bone. This most commonly occurs at the distal radius following a fall on an outstretched arm; the force is transmitted from carpus to the distal radius and the point of least resistance fractures, usually the dorsal cortex of the distal radius."