Eric and Brett Lindros
Eric Lindros won the 1995 Hart Trophy as NHL MVP and led the Flyers to the 1997 Stanley Cup Final, but his career was diminished and ended by eight concussions that began in 1998. He suffered four during 1999-2000, one on a hit by Devils defenseman Scott Stevens in the playoffs. His health and criticism of the Flyers' medical staff became a source of friction with GM Bobby Clarke. After sitting out 2000-01, Lindros was traded to the Rangers and later retired in November 2007 after stops in Toronto and Dallas. Younger brother Brett was a first-round pick by the Islanders in 1994. He retired in 1996 at age 20 after his third concussion -- two within eight days. "What was scary for me was each time it took longer to resolve -- my last concussion before my 20th birthday took eight or nine weeks," he told The New York Times. "Sometimes I had memory loss on the bench."