An adapter assembly for selectively interconnecting a surgical end effector and a surgical device, the adapter assembly comprising: an adapter knob housing configured to couple to the surgical device, the adapter knob housing having an inner surface defining a lumen extending longitudinally through the adapter knob housing, the adapter knob housing including a ring gear formed in the inner surface of the adapter knob housing an outer tube having a proximal end supported by the adapter knob housing and a distal end configured to couple to the end effector and a proximal drive shaft defining a longitudinal axis and rotatably supported in the adapter knob housing, the proximal drive shaft having a gear engaged with the ring gear such that rotation of the proximal drive shaft about the longitudinal axis rotates the adapter knob housing and the end effector.
