An implantable spinal disk comprising: an external shell including a pair of sidewalls (104, 108), back wall, front wail, top wall and bottom wall which define a compartment that extends therebetween, the top wall having a first opening from exterior of the shell into the compartment and the bottom wall having a second opening from exterior of the shell into the compartment; a first endplate including a first base portion of a dimension greater than a first dimension of the first opening, a first top portion of a dimension approximately the dimension of the first opening, and at least one first attachment device protruding through the first opening, the first base portion retained in the compartment by the top wall, the first top portion disposed in the first opening and extending about the first opening to form a top contact surface continuous with an exterior surface of the top wall, the at least one first attachment device extending from the first top portion through the first opening and configured to penetrate into a first vertebra; a second endplate including a second base portion of a dimension greater than a second dimension of the second opening, a second top portion of a dimension approximately the dimension of the second opening, and at least one second attachment device protruding through the second opening, the second base portion retained in the compartment by the bottom wall, the second top portion disposed in the second opening and extending about the second opening from a bottom contact surface continuous with an exterior surface of the bottom wall, the at least one second attachment device extending from the second top portion through the second opening and configured to penetrate into a second vertebra; and a core internal component disposed in the compartment and extending from the first sidewall to the second sidewall between the first endplate and the second endplate. an external shell including a pair of sidewalls (104, 108), back wall, front wail, top wall and bottom wall which define a compartment that extends therebetween, the top wall having a first opening from exterior of the shell into the compartment and the bottom wall having a second opening from exterior of the shell into the compartment; a first endplate including a first base portion of a dimension greater than a first dimension of the first opening, a first top portion of a dimension approximately the dimension of the first opening, and at least one first attachment device protruding through the first opening, the first base portion retained in the compartment by the top wall, the first top portion disposed in the first opening and extending about the first opening to form a top contact surface continuous with an exterior surface of the top wall, the at least one first attachment device extending from the first top portion through the first opening and configured to penetrate into a first vertebra; a second endplate including a second base portion of a dimension greater than a second dimension of the second opening, a second top portion of a dimension approximately the dimension of the second opening, and at least one second attachment device protruding through the second opening, the second base portion retained in the compartment by the bottom wall, the second top portion disposed in the second opening and extending about the second opening from a bottom contact surface continuous with an exterior surface of the bottom wall, the at least one second attachment device extending from the second top portion through the second opening and configured to penetrate into a second vertebra; and a core internal component disposed in the compartment and extending from the first sidewall to the second sidewall between the first endplate and the second endplate.