Foo Fighters frontman Dave Grohl may have broken his leg after falling during a show in Sweden last month, but that hasn’t stopped him from continuing the band’s current tour, and perhaps putting on better shows than ever before. Last night, he kicked things up a notch when he brought out a very special guest.

Seated comfortably in his custom-made “rock throne,” Grohl invited his orthopaedic surgeon Dr. Lew C. Schon on stage during the band’s Fenway Park performance, giving him much of the credit for his recovery process. The two dudes then partook in a joint cover of The White Stripe’s classic “Seven Nation Army,” and the doc was not afraid to rock out.

Check out the fan-shot footage above. Break a leg, doc.

(Photo by Matthew J. Lee via The Boston Globe)