Monochrome picture of a children's polio hospital showing two kids beds side by side with one child in a leg lengthening medical apparatus and captioned with Leg lengthening, that apparatus consists of rods that go completely through the bone with the leg bone having been sawed through in a certain configuration.  Using an Allen (Hex) key to turn the rod half a centimeter per day and could stretch a leg to almost 3 inches longer before the bone reconnected".   