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Most frequently humeral shaft fractures occur as a result of a direct blow to the upper arm (transverse fractures). Indirect trauma from a fall or a twisting action (e.g. arm wrestling) are also encountered and usually result in spiral or oblique fractures 1,3.
Greenstick fracture: an incomplete fracture in which the bone is bent. This type of fracture occurs most often in children. Transverse fracture: a fracture at a right angle to the bone's axis. Oblique fracture: a fracture in which the break is at an angle to the boneâs axis. Comminuted fracture: a fracture in which the bone fragments into several pieces.