The Knicks' Marcus Camby has been in the league's elite group of stoppers for more than a decade. The 38-year-old big man has made a good living off of forcing opposing players to alter their shots. He has led the NBA in blocks three separate times, and he was named the NBA's Defensive Player of the Year in 2007.

But Camby is also part of a rarer group no one is itching to be a part of: players who have inexplicably lost the ability to shoot free throws.

"It's...