A surgical instrument includes a selectively rotatable housing, an adaptor, and a shaft including an end effector. The adaptor is coupled to the housing and is selectively movable between a first position and a second position. The shaft is coupled to one or both of the housing and the adaptor. The end effector is articulable in response to the selective rotation of the housing. The end effector is articulable toward a first direction when the adaptor is positioned in the first position and articulable toward a second direction when the adaptor is positioned in the second position. The first and second directions are different.
