Diagnosed with spastic diplegia cerebral palsy just after his first birthday, he was limited to crawling and walking with the assistance of a walker until January's selective dorsal rhizotomy (SDR) ...

Claudia Avalos keeps a video clip of her son on her cellphone — an image of a happy 13-year-old taking labored steps on the balls of his feet, heels never touching the ground, legs permanently bent, ...