Yes it is possible. Most common method includes the use of a device called as ilizarov external fixator. The procedure would involve cutting the bone partially at one point in the leg and then stretching it with the above mentioned implant. It's done gradually over a period of 2 or 3 months . However do visit your Orthopaedic surgeon to ask about further details . If you want to do an online search , use the terms "limb lengthening with ilizarov",