An actuation input mechanism for a teleoperated surgical instrument may include an interface structure and a shaft connected to the interface structure. The interface structure may be engageable with a drive structure of an actuation interface assembly of a teleoperated surgical system to be driven by the drive structure. The shaft may be rotatable in response to the interface structure being driven. The interface structure may comprise a depression shaped and sized to receive a fingertip. The interface structure may further comprise one or more gripping features disposed in the depression. A surgical instrument for a teleoperated surgical system may include an instrument shaft, an end effector, and a force transmission mechanism. The force transmission mechanism may comprise an actuation input mechanism to transmit drive forces to actuate the surgical instrument, the actuation input mechanism including an interface structure and a shaft.
