An apparatus for inserting an intervertebral prosthesis within a spine of a mammal includes: a handle including a drive nut operating to produce rotational torque in response to user-input about a central axis; a first drive shaft including a proximal end in communication with the drive nut, receiving rotational torque therefrom, and imparting rotational torque to the first drive shaft about a first axis, which is laterally offset from the central axis; and a distal end of the first drive shaft including a first drive head; and a chuck disposed at a distal end of the tool for engaging the intervertebral prosthesis during implantation, wherein the first drive shaft extends through the chuck and the first drive head engages a first gear of the intervertebral prosthesis, such that rotation of the first gear causes rotation and deployment of a first anchoring element of the intervertebral prosthesis.