The 50 year old, whose real name is Paul Hewson, is under the care of neurosurgeon Dr. Joerg Tonn and Dr. Hans-Wilhelm Mueller-Wohlfahrt, according to a statement on U2's website.
Mueller-Wohlfahrt could not be reached for comment.
Band manager Paul McGuinness, in an MP3 posted on the website, said Friday that because of the injury, the band's "360-Degree" June 3 show in Salt Lake City, Utah, has been postponed. It was not immediately clear if other dates also were canceled.
McGuinness says, "We hope to get things resolved as soon as possible."
Online: http://www.u2.com
