Source: Rajah.com.

-- The Undertaker has undergone hip surgery, according to ProWrestling.net. He had been suffering from hip and back pain for several months and the hope is that the surgery will eliminate the pain in both areas.
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Ouch. I didn't know he had hip problems; I can't remember if I've heard anything about his back. I mainly heard it was his knees. Regardless, I wish him a healthy & speedy recovery. I hope the pain is gone & that he'll be back soon.