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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.
Definition of shaft in US English - a long, narrow part or section forming the handle of a tool or club, the body of a spear or arrow, or a similar implemen dictionary thesaurus