When Joey Abicca pokes a metal crutch into the ground with his right arm, tiny motors start whirling around his left leg, lifting it and moving it forward. When he does the same with his left arm, the motors whir to life again and his right leg takes a step. The metallic whine is like something out of the movie "RoboCop."
Mr. Abicca, a 17-year-old from San Diego, is essentially wearing a robot. His bionic suit consists of a pair of mechanical braces wrapped around his legs and electric muscles that do much of the work of walking. It is controlled by a computer on his back and a pair of crutches held in his arms that look like futuristic ski poles.