Mechanisms include: * Fall outstretched hand with the forearm in excessive pronation (hyper-pronation injury). The ulna fractures in the proximal one-third of the shaft due to extreme dislocation. Depending on the impact and forces applied in each direction, degree of energy absorption determines pattern, involvement of the radial head and whether or not open soft tissue occurs. * Direct blow on back of upper forearm would be a very uncommon cause. In this context, isolated ulnar shaft fractures are most commonly seen in defence against blunt trauma (e.g. nightstick injury). Such an isolated ulnar shaft fracture is not a<unk> . It is called a 'nightstick fracture'.
Monteggia fracture
Bosworth fracture
Smith fracture
Maisonneuve fracture
Duverney fracture
Rolando fracture
Holdsworth fracture
Hume fracture