Just learned from Stephen Lee that Yokoyama Chisa was involved in a traff
ic accident and got her left arm broken on 29 Aug.  She was driving her G
enchari (bicycle with an engine), and got hit by the door of a stationary
 car when someone try to opened the door from inside.  It is estimated th
at she need 3 weeks to recover from the injury. 

After some digging : 
http://chisa-club.cocolog-nifty.com/blog/2009/08/
The first 2 entries of her blog have photos of her current status.

--
'CuSO4' Yung