Abstract: System of intervertebral disc prostheses which includes standard prostheses and corrective prostheses. The corrective prostheses serve to compensate for a ventro-dorsal offset. They are characterized in that, on one of their cover plates (15), the surface (4?) via which it cooperates in a matching manner with the prosthesis core (3?) is offset ventrodorsally relative to the contact surface (7) by comparison with the standard prostheses.

Abstract: Surgical instrument for inserting an intervertebral endoprosthesis consisting of two prosthesis plates and a prosthesis core. The instrument has two prosthesis holders open at the ends that can be spread apart from each other. In order not to have to remove the instrument from the prosthesis with the latter being under unfavourable loading, it is provided with a withdrawal device which bears on the prosthesis and/or on an associated vertebra. The withdrawal device comprises a slide having a prosthesis limit stop for the prosthesis located in the guide and/or a vertebral limit stop for a vertebra which is to be connected to the prosthesis. The slide is displaceable in a slide guide between a retracted end position and an advanced end position by an actuating device.

Abstract: System of intervertebral prostheses which comprise a prosthesis core (5) and two cover plates (4, 6) which enclose the prosthesis core (5) by way of internal engaging surfaces (7). The system includes corrective cover plates (6) whose vertebral contact surface (12) is lengthened in the AP direction dorsally beyond the extent of standard prostheses (4). In sagittal section, the corrective cover plates are dorsally thickened, in particular wedge-shaped. The inner face (11) of the part (10) constituting the dorsal lengthening is beveled or recessed.

Abstract: A plastic implant having a sliding core, such as an intervertebral endoprosthesis, is formed with a peripheral, preferably circumferential, channel that is configured to receive a radiographic contrast wire. The channel may be partially or fully closed to an outside portion of the sliding core and may include a restriction in the profile of the channel that acts to partially close the channel to the outside portion of the sliding core. The restriction may have a width that is less than the diameter of the radiographic contrast wire. The channel may also include an insertion opening adapted to accept the wire.

Abstract: Intervertebral prosthesis (10) with at least one cover plate (11) which bears on a vertebral body (1) and is to be firmly connected thereto. In order to ensure that the prosthesis (10), during its insertion or during its lifetime, does not contribute to a protruding bone margin (5) breaking off, the cover plate (11) is provided with a bulge (12) corresponding to the depression (4) and/or with a bevel, a shortened end or rounded end (13).

Abstract: System of intervertebral prostheses which comprise a prosthesis core (5) and two cover plates (4, 6) which enclose the prosthesis core (5) by way of internal engaging surfaces (7). The system includes corrective cover plates (6) whose vertebral contact surface (12) is lengthened in the AP direction dorsally beyond the extent of standard prostheses (4). In sagittal section, the corrective cover plates are dorsally thickened, in particular wedge-shaped. The inner face (11) of the part (10) constituting the dorsal lengthening is beveled or recessed.

Abstract: Surgical instrument for inserting an intervertebral prosthesis, having first and second prosthesis holders (52A, 52B) for a pair of prosthesis plates, which holders are connected to one another by a parallel guide (57) and can be spread by a lever arrangement (131). The first of the prosthesis holders is arranged on an elongate instrument body in order to give the surgeon an exact picture of the orientation of the prosthesis and to allow force to be exerted in exactly this direction. The actuating lever (131) is articulated with its front end on the second prosthesis holder (52B) so as to pivot about a spindle (130) extending transversely with respect to the longitudinal direction of the instrument body (51) and to the direction of spreading. Behind this spindle (130), it has a limit stop (133) which acts directly or indirectly on the instrument body (51) or the first prosthesis holder (52A). The lever arrangement can also be the other way around.