A tibial prosthesis has a bearing component configured for an anterior-medial insertion, which advantageously avoids the extensor mechanism of the knee. A tibial tray may include a banana-shaped boss that corresponds to a notch formed in the bearing component. After the bearing component is inserted along the anterior-medial path, the boss is received within the notch by rotating the bearing component with respect to the tibial tray. This rotation seat the bearing component upon the tibial tray in the manner of a fixed-bearing prosthesis. Alternatively, the boss and notch may define angled central axes which allow straight anterior-medial insertion of the bearing component and locking engagement to the tibial tray.

A method and apparatus for spinal fusion at the facet joint using an irregularly shaped implant where the orientation of the implant can be preselected before implantation.

Methods for preparing a bone in surgery using an imaging system, a navigation system having a locating device, and a robotic system having a cutting tool. A cannula is guided into an incision to expand the incision and provide access to the bone so that the cutting tool is insertable through the cannula to remove material from the bone. An implant is insertable through the cannula to be placed in the bone.

A prosthetic intervertebral spacer includes a body having a front end, a rear end, an anterior side, a posterior side, a top surface, and a bottom surface, and an arcuate interface extending away from the body and being connected to the rear end and the posterior side of the body. A method of inserting and positioning the spacer includes engaging a tool to the interface, inserting the spacer at least partially into the intervertebral disc space by moving the tool along an insertion direction, and allowing the spacer to rotate with respect to the insertion direction within the intervertebral disc space while continuing to move the tool along the insertion direction.

An orthopedic tibial prosthesis includes a tibial baseplate with an asymmetric periphery which promotes proper positioning and orientation on a resected tibia, while also facilitating enhanced kinematics, soft-tissue interaction, and long-term fixation of the complete knee prosthesis. The asymmetric baseplate periphery is sized and shaped to substantially match portions of the periphery of a typical resected proximal tibial surface, such that proper location and orientation is evident by resting the baseplate on the tibia. The baseplate periphery provides strategically positioned relief and/or clearance between the baseplate periphery and bone periphery, such as in the posterior-medial portion to prevent deep-flexion component impingement, and in the anterior-lateral portion to avoid undue interaction between the anatomic iliotibial band and prosthesis components.

A method includes generating a surgical plan for installation of a structure at a bone and controlling a controllable guide structure to guide a cutting tool to sculpt the bone and the structure based on the surgical plan. Sculpting the bone provides the bone with a bone mating surface and sculpting the structure provides the structure with a structure mating surface. The method also includes installing the structure on the bone by engaging the structure mating surface of the structure with the bone mating surface of the bone.

Implant includes a body and a utile feature, for example, a smooth articulating surface. A transverse rail stem system with a plurality of rails is provided, spaced apart from the utile feature, which is adapted for transverse insertion into a bodily substrate, for example, resected bone. A surgical templatefor example, to assist in sawing, drilling with a drill bit and drill guide, and broaching with a broachalong with such bone removal tools can help prepare the bone for receipt of the implant.

A system comprising a fusion cage and at least one engagement member is provided. The fusion cage includes a first member and a second member. The engagement member is configured to retain the first and second members in an expanded state while simultaneously fixing the fusion case to adjacent vertebrae.

A method and apparatus for spinal fusion at the facet joint using an irregularly shaped implant where the orientation of the implant can be preselected before implantation.

Bifunctional and assembled implants are provided for osteochondral implantation.