If you are fully grown, there are a few methods, but nothing short of surgery will help. Here's a nice topic on a medical forum about your question:

http://www.doctorslounge.com/forums/viewtopic.php?t=631
Post by: Dr. Tamer Fouad Medical Doctor
"Limbs can be grown longer by a process called distraction histogenesis or the Ilizarov method, which is named for the pioneering work done in the early '60s by the Russian physician. There are three phases to the treatment. First, through a small incision, the bone is cut so it can be lengthened. It is done very carefully so the periosteum, or bone covering, is preserved, since it plays a major role in forming new bone. The surgeon then places a device, known as an external fixator, around the leg. It is comprised of lightweight carbon rings or a carbon bar that is attached to the bone, through the leg, by wires and/or screws. The wires are placed under a predetermined amount of tension. The fixator will be used to slowly pull the bone apart."

The thread also goes on to mention things like HGH and other techniques for growing bone.

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