German Chancellor Angela Merkel arrives on crutches for the opening ceremony of the "Hannover Messe" industrial trade fair in Hanover April 3, 2011. Merkel
underwent a knee operation late on Thursday after suffering a tear in the meniscus of her knee. The injury was not due to a fall or accident, it just developed, a government spokesman said.
REUTERS/Thomas Peter (GERMANY - Tags: POLITICS SCI TECH BUSINESS)