Derrick Rosehas been through a lot, yet he keeps pushing. After playing only 10 games the past two NBA seasons because of a torn ACL in his left knee and torn meniscus in his right knee, the Chicago Bulls point guard showed no signs of wear and tear, aggressively slashing to the hoop and pulling up for jumpers during Team USA training camp in Las Vegas on Monday. Rose's convincing performance marked his highly-anticipated comeback from knee injuries and makes us optimistically think that he can be a force in the NBA once again. Whether Rose can put together a full NBA season without injury remains to be seen, but at least we're hopeful. So many sports stars of the past had their careers dashed by injury. Here's a look at those stars who have that dreadful "if they stayed healthy" asterisk lingering over their legacy.