An unusual video has emerged of Dave Grohl's orthopaedic surgeon - treating his broken leg - performing The White Stripes' 'Seven Nation Army' at a Foo Fighters gig in Boston, Massachusetts on Sunday.<br /><br />The footage, captured by a member of the audience at Boston's Fenway Park, shows Dr. Lew C. Schon singing the blues rock hit after being brought onto the stage by the band.<br /><br />After the bizarre performance, Grohl can be heard saying ""Holy s***, that's actually my doctor,"<br /><br />Writing online about the video, the filmer said "Foo Fighters wrapped up the July leg of their stadium-filling "Throne" tour Sunday night with a second show at Boston's Fenway Park, where the band paid homage to the man who practically made this trek possible: Dave Grohl's orthopedic surgeon. <br /><br />"Midway through Foo Fighters' set, Grohl invited Dr. Lew C. Schon, who helped the rocker after Grohl seriously injured his leg in Sweden, onstage to lead the band in a spirited rendition of White Stripes' "Seven Nation Army."
