"I had ACL reconstructions, and in November I'm getting knee replacement surgery. It'll take me about three or four months to recover . . . I've had so many operations on my knees and feet that just to be standing is a miracle. But to turn around and do one of my spins where I don't fall, that's the sh*t! But hey, all these years have taken their toll on me."

Tyler's health issue came up while the singer was promoting Aerosmith's forthcoming DVD release, "Rock For The Rising Sun," as well as his thoughts on working on his first solo album.

Tyler has been writing with his longtime collaborator Marti Frederiksen and hopes the album will come out in October or November of 2014. "It might be hard to decide when I write a song whether or not it should go on an Aerosmith album," he says.