This article is from the U2 FAQ, by Maryann Stump stumpm@juno.com with numerous contributions by others.
[MJS] He didn't. He popped part of his collarbone out of socket at RFK
stadium in Washington, DC when he
fell on a wet stage. Unfortunately, this was not properly diagnosed until
a week later in Boston. He had to wear
a brace and sling for the remainder of the US tour and could not play
guitar. He later said at a press conference
that "the others find it a real pleasure" that he couldn't play in
concert.
[MPZ] In reference to Bono's shoulder dislocation in 1987, I was at their
9/29/87 concert at Madison Square
Garden in NYC and Bono most definitely played guitar for a couple of
songs in the latter part of the concert.
He made a show of ripping off the sling and said something to the effect
of how he wasn't supposed to be
playing, but that he was going to do it anyway. He did look like he was
in pain a little while he was playing
though. This concert was about ten days after he suffered his injury.
 
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