Abstract: In a casting apparatus for external skeletal and joint fixation, a plurality of articulated segments may comprise a plurality of cuboid members threaded on a continuous cord having distal ends connected to actuators. The cuboid members may be disposed between guide members threaded on the cord. Actuation of the actuators applies a tension force to the cord, thereby compressing the cuboid members together to form rigid cuboid segments and maintain the casting apparatus in a rigid configuration for skeletal and joint fixation.