Etiology of Abdominal Trauma Abdominal trauma is typically also categorized by mechanism of injury: Blunt Penetrating Blunt trauma may involve a direct blow (eg, kick), impact with an object (eg, fall on bicycle handlebars), or sudden deceleration (eg, fall from a height, vehicle crash). The spleen is the organ damaged most commonly, followed by the liver and a hollow viscus (typically the small intestine).