VIDEO: Foo Fighters' Dave Grohl Invites His Doctor Onstage to Sing 'Seven Nation Army'

At last night's 'Throne' tour concert held at Boston's enway Park, Foo Fighters saluted the orthopedic surgeon responsible for literally getting lead singer Dave Grohl back on his feet.

Midway through the set, Grohl brought Dr. Lew C. Schon, who worked on the rocker after he seriously injured his leg while onstage during a concert held in Sweden, on to the stage to lead the band in a spirited version of White Stripes' "Seven Nation Army."

Following the impromptu performance, Grohl shouted, "Holy s, that's actually my doctor," which led the crowd to begin chanting "Lewwww." "What a badass." Check out the video!