Brtain's Paula Radcliffe is unlikely to defend her marathon title at the world championships in Japan this August after developing a stress fracture to the base of her spine.
<p><a href="http://rss.cnn.com/~a/rss/edition_sport?a=MjWVq9"><img src="http://rss.cnn.com/~a/rss/edition_sport?i=MjWVq9" border="0"></img></a></p><img src="http://rss.cnn.com/~r/rss/edition_sport/~4/113622847" height="1" width="1"/>

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