The Fitbone method uses a self-expanding internal device (an intramedullary nail or rod) manufactured by the German company Wittenstein.
The nail is surgically inserted into the bone (tibia and/or femur). After the nail placement procedure, the patient is hospitalized for five days to allow the bones to rest and begin the healing process. This period is known as the latency period. Then, the distraction phase or pulling apart of the bones begins.
After programming the intramedullary nail, the device is able to gradually lengthen the bones thanks to an electronic motor inside it.