Previously I had heard of limb lengthening operations that involved repeatedly breaking, stretching and reseparating bones. Extremely painful and debilitating, prone to infection.
I’ve only just heard of a method that has been in use around a decade, which involves inserting a titanium rod inside the bone without fracturing it, and slowly extending in magnetically so that the bone and muscle grow along with it.
Doctors surgically insert a titanium rod inside the thigh or shin bone, or both. The rod contains a small magnetic motor and gear box that is used to slowly lengthen the rod. It’s powered by a hand-held magnetic field generator placed atop the skin at the site of the magnet four times a day for about a minute.Like the external fixator, when the bone is pulled apart — at a rate of about a millimeter a day — tissue and eventually new bone fills the gaps. The procedure can stretch each part of a limb about three inches. A bone typically takes at least two months to lengthen and three months to solidify. The rod is removed about a year later.
https://www.baltimoresun.com/health/bs-hs-limb-lengthening-20140521-story.html