The type of trauma you experienced, as you know, is a result of exerting too much pressure against your chambers and smooth muscles of your penis. It is not unlike a rupture in the sidewall of a tire; when extreme pressure is exacted i.e. you hit a pot hole, the tire has the potential to burst. You blew out your sidewall and hence the deformation. Ususally, except in serious cases or prolonged abuse your sidewall will repair itself and return to normal shape. Warm compresses and rest will restore the strength and shape.