An intervertebral disc prosthesis for installation in, a spinal column includes a first intervertebral plate for engaging one or both of the inferior vertebral endplate and the inferior ring apophysis of a superior vertebral body. A second intervertebral plate for engages one or both of the superior vertebral endplate and the superior ring apophysis of an inferior vertebral body. A removable insert core is located between and engages the intervertebral plates. A projection projects from one of the intervertebral plates toward the other intervertebral plate. The removable insert core at least partially surrounds the projection when installed. The removable insert core is removable from between the intervertebral plates and from around the projection while the intervertebral plates and projection remain installed.