Prosthetic spinal disc system

A prosthetic spinal disc system, the system comprising:

• a nucleus component having an upper surface configured to engage a superior vertebra and a lower surface configured to engage an inferior vertebra, the nucleus component further having a recess extending circumferentially through an outer surface of the nucleus component situated substantially between the upper surface and the lower surface of the nucleus component;
• an anchor component comprising a plate having a concave inner surface configured to engage the superior and inferior vertebrae, the anchor extending between a first end configured to engage the superior vertebra or and an opposite second end configured to engage the inferior vertebra;
• and
• a tether having an inner surface, an outer surface and a second section forming at least one leg portion, wherein the inner surface of the tether is disposed within the circumferential recess in the outer surface of the nucleus component and the outer surface of the tether engages the inner surface of the anchor to flexibly attach the anchor to the nucleus component such that the outer surface of the tether extends a distance past the outer surface of the nucleus component, a first end of the at least one leg portion engages the inner surface of the anchor and a second end of the at least one leg portion engages the tether such that the tether flexibly attaches the anchor to the nucleus component.