A system for fixing a prosthetic component to an anchor implanted in the bone of a patient. The prosthetic component includes a fixing channel and an installation channel. The fixing channel opens to an engagement collar configured to engage with a bone anchor. The installation channel opens from an outer surface of the prosthetic and communicates with the fixing channel. The installation channel permits placement of a fastener therethrough into the fixing channel to secure the prosthetic to the bone anchor. The axes of the fixing channel and the installation channel intersect at a point which lies within the radius of a fastener seat which is configured to engage a head of the fastener when the fastener is placed into the fixing channel.

A method of treating a spine includes implanting a spinal implant within a patient. The spinal implant includes a first member having a first wall defining an axial passageway and a first opening, the first opening being in communication with the axial passageway. A second member includes a second wall defining an axial channel having the first member disposed therein, the second wall defining a second opening in communication with the axial channel. Bone graft is injected through the first opening and into the axial passageway and through the second opening and into the axial channel after the spinal implant is implanted within the patient.

A tibial trial insert system includes a bearing component having a superior articulating surface for articulation with a distal femoral surface, a plate component having an inferior fixation surface for fixation to a proximal tibia, and an adjustment arrangement for adjusting a proximal/distal spacing between the bearing component and the plate component. The adjustment arrangement includes an adjustment device having a superior connector element that engages an inferior surface of the bearing component, an inferior base element adapted to be placed upon a superior surface of the plate component, and a telescopic mechanism coupled to the connector element and the base element. The telescopic mechanism can adjust a thickness of the adjustment device. At least one shim is insertable between the superior surface of the plate component and an inferior surface of the base element for adjusting a height level of the adjustment device relative to the plate component.

Disclosed is a bone screw and a fixation system specifically configured for fixing a bone fusion device into a human or animal body with the aid of a specifically designed fastening unit. A bone fusion system including at least two such bone screws in said bone fusion device is also disclosed along with said fastening unit.