WWE Hall of Famer Kurt Angle just underwent a brutal procedure on Tuesday -- the American Hero had BOTH his knees replaced ... but, luckily, he says everything went off without a hitch!!
The Olympic gold medalist posted a video from the hospital bed minutes ago ... shouting out his fans for their well-wishes and detailing the long road of recovery ahead.
"Thank you all for your prayers and best wishes for my 2 knee replacement surgeries today," Angle said Tuesday. "So far so good."
"I realize rehab is going to be a bitch, but I'm ready for it.