As WWE Champion CM Punk’s potential title defense against Ryback approaches on the Jan. 7 edition of Monday Night Raw, WWE.com can report that The Straight Edge Superstar has been medically cleared for in-ring competition several weeks after his undergoing knee surgery. The news was confirmed on the Jan. 2 edition of WWE Main Event on ION Television, where WWE physician Dr. Michael Sampson Touted his diagnosis to the WWE Universe. The decision returns Punk…