<p>File picture shows U2 lead singer Bono during a ceremony where a portion of West 53rd Street was renamed U2 Way in New York March 3 2009 Bono has undergone emergency back surgery on May 21 2010 for an injury sustained during tour preparation training He was admitted to a specialist neuro surgery unit in a Munich hospital Picture taken March 3 2009 REUTERS Gary Hershorn File < p>