a href="http://www.nytimes.com/2009/02/11/sports/othersports/11motocross.html?partner=rssnytemc=rss"img src="http://graphics8.nytimes.com/images/2009/02/11/sports/11moto.75.jpg" border="0" height="75" width="75" hspace="4" align="left"/aIn a sport in which riders soar dozens of feet through the air while pulling aerial maneuvers, gruesome injuries are an accepted part of the game. More...