Aerosmith have cancelled a gig in Venezuela after guitarist Joe Perry developed "unforeseen complications" with his replacement knee.
Perry, 58, had been forced to undergo emergency surgery, a spokeswoman said in a statement.
The veteran rock band were due to headline Solid Fest in Caracas on 1 February in what would have been their first Venezuelan concert.
Singer Steven Tyler said the band hoped "to see everyone there soon".
"Playing Venezuela was my idea of a perfect way to start the New Year," he added in the statement.
"But having heard Joe had to revisit the hospital this month, the band are truly disappointed we can't be in Caracas and we hope to see everyone there soon."
Perry had his replacement knee operation last March.
Last May, Tyler has said he had checked into a rehab unit because he needed to find a "safe environment" to recover from foot surgery.
He issued the statement following reports that he had entered a Los Angeles clinic.
Tyler, 60, had problems with drugs and alcohol in the 1970s and 1980s before completing rehabilitation in 1986.
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