third of the bone, with a dislocation at the distal radioulnar joint These injury patterns are due to the anatomic relationship of the radius and ulna, with their points of articulation at the proximal and distal radioulnar joint and accompanying fibrous interosseous membrane This relationship is such that when there is direct trauma to one bone, the force is transmitted to the other, typically at the points of articulation FIGURE 111.26 A Monteggia fracture in a 3-year-old boy Note that a line drawn along the axis of the radius would fail to intersect the capitellum (compare with Fig 111.16 ) FIGURE 111.27 Sensory innervation of the wrist and hand (Reprinted with permission from Moore KL, Dalley AF, Agur AMR Clinically Oriented Anatomy 8th ed Philadelphia, PA: Wolters Kluwer; 2018.)