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Surgery. They cut your legs through the bone - put a metal pin/frame through the skin and bone and stretch the bones apart, thereby allowing the bone to regrow between the gap created. It takes several years and can add several inches to your height if you really want to be taller.
Here's a full description:
BONE LENGTHENING
This series of treatments involves several surgical procedures, a lengthy convalescence period, and considerable risks -- but it can add up to 6 inches of length to a leg.
While the child is under general anesthesia, the bone to be lengthened is cut. Metal pins or screws are inserted through the skin and into the bone.
Pins are placed above and below the cut in the bone, and the skin incision is stitched closed.
A metal device (usually some sort of external frame) is attached to the pins in the bone and will be used later to gradually pull the cut bone apart, creating a space between the ends of the cut bone that will fill in with new bone. The lengthening device is used very gradually to ensure adequate filling of the bone and stretching of the soft tissues.
Later, when the leg has reached the desired length and has healed (usually after several months), another surgical procedure will be done to remove the pins.
Because the pins or screws are inserted through the skin into the bone, special care of the pin sites is important to prevent infection. Also, because the blood vessels, muscles, and skin are stretched with each lengthening, careful and frequent checking of the skin color, temperature, and sensation of the foot and toes is necessary to prevent circulatory, muscular, or nerve damage.
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