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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.
fissure fracture a crack extending from a surface into, but not through, a long bone. greenstick fracture one in which one side of a bone is broken and the other is bent, most commonly seen in children. See illustration. impacted fracture fracture in which one fragment is firmly driven into the other. incomplete fracture one that does not involve the complete cross section of the bone.