Abstract: Apparatus for teaching treatment of a skeletal injury including an artificial body part having two spaced-apart portions made of shape permanent material and a portion of non-rigid deformable material disposed in the space between said shape permanent portions; a hollow, elongated bone-simulating member in each shape permanent portion, the members projecting from their respective shape permanent portions into the deformable portion so as to face each other and form therein a place of simulated skeletal injury; connected to the projecting ends of the members for applying thereto a force which resiliently resists separation of the projecting ends of the members in the longitudinal direction; a locking pin longitudinally movable within the members between a position wholly within one member and a position partially within both members for releasably locking the members against angular displacement relative to each other; and a manually operable device connected to the locking pin for applying a longitudinal movi