48 hours." >> most people don't know that kids can get arthritis, too. >> reporter: ten-year-old graci diggsy just make you believe in miracles. only a year ago, graci spent much of her time like this. >> you've seen graci in a wheelchair? >> yes. >> reporter: anna diggs is graci's mom. >> seeing your child in a wheelchair is very difficult, especially when you have... any child, but graci was so outgoing, athletic, she loved sports. >> reporter: when graci was four years old, she was diagnosed with juvenile rheumatoid arthritis, debilitating pain that can make even simple tasks excruciating. >> trying to put on my clothes, raising my arms, using my knees to get up. >> reporter: are there some days you don't feel like getting out of bed at all? >> a lot of days. >> reporter: yet just look at her now. the diggs credit graci's miraculous mobility to humira, one of the nation's top-selling drugs. since she started taking it earlier this year, her painful arthritic conditions have all but disappeared, and that wheelchair is in the garage. >> she plays volley, basketball and softball. >> and foot