Abstract: Intervertebral arthrodesis for insertion in an intervertebral space separating opposite faces of two adjacent vertebrae has a ring shaped intervertebral cage having a bar that extends perpendicular to the axis of the spine. The bar has a height less than the rest of the cage. A surface of the cage contacting the vertebrae has an undulating shape for limiting sliding of the cage in a plane parallel to the vertebrae faces.

Abstract: A multi-layer intervertebral spacer (1) includes at least three superimposed layers, i.e. lower (3), top (2) and at least one intermediate (4) layers, wherein the at least one intermediate layer (4) is made of a material which differs from the material of the lower (3) and top (2) layers and is less rigid and the inventive spacer, in a view from below, is generally shaped in the form of a bean and can be placed by means of a posterior or pasterolateral surgery.

Abstract: A posterior vertebral joint prosthesis is provided so that the left or right posterior vertebral joint prosthesis (1, 2) presents a smooth bearing surface (11, 11a, 11b, 17, 17a, 17b) and and which surface presents antero-posterior curvature.

Abstract: The present invention relates to a posterior vertebral joint prosthesis. The left or right posterior vertebral joint prosthesis of the invention presents a smooth bearing surface and said surface presents antero-posterior curvature.

Abstract: The present invention relates to an osteosynthesis device, particularly for spinal support or correction, enabling easier and compact implantation, that can be particularly used in the case of implantation via the anterior approach, and a preassembly method for such a device. Said device comprises implants screwed into two vertebrae (0) and a plate (2) used to hold and displace the spine. Said plate (2) comprises on at least one of its ends at least one longitudinally elongated opening, said opening having firstly at least one part opening onto an edge of the plate, or one part of a sufficiently large size (s210b) to be able to be inserted without disassembly in the fixation means of an implant (1) already screwed into the spine when said fixation means are already assembled.

Abstract: The present invention relates to an osteosynthesis device, particularly for spinal support or correction, enabling easier and compact implantation, that can be particularly used in the case of implantation via the anterior approach, and a preassembly method for such a device. Said device comprises implants screwed into two vertebrae and one plate characterized in that the plate is joined to at least one implant by attachment structure able to hold said plate without preventing the implant from rotating on its screwing axis, or without preventing a specified clearance of the plate with respect to the implant. In this way, said attachment structure make it possible to continue screwing the implant, or adjust the position of the plate after the plate has been on the implant.

Abstract: Intervertebral arthrodesis for insertion in an intervertebral space separating opposite faces of two adjacent vertebrae has a ring shaped intervertebral cage having a small bar that extends parallel to the axis of the spine. The bar has a height less than the rest of the cage. A surface of the cage contacting the vertebrae has an undulating shape for limiting sliding of the cage in a plane parallel to the vertebrae faces.

Abstract: A cage for use in a spinal repair system wherein a pair of inert, relatively open bone-graft contouring cages are disposed between adjacent vertebrae mounted to the boney structure of these vertebrae wherein the vertebrae will knit together and act as a single unit. The upper and lower surfaces of the cages follow an arcuate path for increased contact with the abutting surfaces of the vertebrae themselves.