Depression fracture: A fracture where a fragment of bone is driven inward below the level of the surrounding bone without complete splintering or shattering. In long bones or flatter skeletal structures subjected to a localized blunt impact (a blow), this presents as a distinct indentation.
Blowout fracture: Typically involves a fracture of the thin bones forming the floor or medial wall of the orbit (eye socket), usually caused by direct blunt trauma to the eye globe rather than an impact to the arm.
Ponds fracture: A specific type of depressed skull fracture seen in infants and young children, where the soft cranial bone indents inward like a dented Ping-Pong ball. While similar in mechanism, it is specifically localized to the skull rather than long bones like the arm.
