Sam Williams and his parents knew something was wrong when it hurt for the 8-year-old to grip a baseball bat, but they never considered juvenile arthritis.
It hurt to write, giving Sam a sound excuse for not wanting to do his homework -- or even his work at school. After several weeks, Sam's pain grew worse -- and moved into his knees. He also had pain in his jaw and had trouble walking.
"His brother had to carry him piggyback up the stairs," says Rose Williams, Sam's mother.
After several months,...