Abstract: A prosthesis for a cervical intervertebral disk for fastening two contiguous vertebrae, including two components, one of which is for attachment to a first contiguous vertebrae and a second is for attachment to a second of the two contiguous vertebrae, the one component comprises a hollow box frame and includes a first end having first attachment for attaching the first end to one vertebra for holding the first attachment thereto and a connection at a second end for receiving a connector coupled with the second component, the second component comprises a first end part for attachment to the other vertebra to the second vertebra for holding the second component thereto, and a second end part having the connector connected with the first end part to permit movement between the connector and the connection.