Because they are inserted using a minimally invasive procedure, intramedullary nails are often preferred by patients. Compared to external methods, the new grown bone can stand full bearing earlier. Precice There is a magnet and a drive inside the PRECICE intramedullary lengthening nail made by Nuvasive. The drive is set in motion by an external motorised control unit and works by magnetic induction: the control unit with the counter-magnet is held over the nail in the bone and the internal magnet. This allows the nail to be lengthened or shortened. Precice Stryde The latest generation: the Precice Stryde nail made by Nuvasive is the first limb lengthening nail that allows full weight-bearing directly following the procedure. Patients therefore do not require any walking aids after surgery. This nail is also lengthend using an external control unit. Nuvasve BT-Nail In a similar way to the distraction osteogenesis method with intramedullary lengthening nail, bone transport nails may now also be used. This technique can be used to correct bone defects that can arise following accidents, infections, or tumours.