Superior and/or inferior facets of one or more facet joints may be replaced by superior and/or inferior facet joint prostheses. In one embodiment, a kit of superior or inferior prostheses is provided, in which the prostheses have at least two dimensions that vary among members of the kit independently of each other. Each prosthesis may have a bone engaging surface having a surface that is polyaxially rotatable against a corresponding resection of a vertebra. Each prosthesis may also have an articulating surface shaped such that, after attachment to the spine, the replaced or partially replaced facet joints provide a larger medial-lateral range of motion when the spine is flexed than when the spine is extended. Crosslinks may be used to connect left and right prosthesis together in such a manner that they are stabilized in a position in which they are seated directly against the vertebra.

A device for ameliorating joint conditions and diseases comprising a) a first section comprising a joint-ward end, an opposing mating end, and a lateral wall, a peripheral column partially forming the lateral wall of the first section, a central column, and three or more than three struts extending between and connecting the peripheral column and the central column, and each strut thereby supporting the central column, the joint-ward end further comprising a plurality of fenestrations formed by a confluence of the peripheral column, the central column and two adjacent struts of the three or more than three struts, and first section further comprising a central aperture within and formed by the central column, and configured to mate with a driver, b) a second section comprising a mating end, an opposing leading end, and a lateral wall, the lateral wall of the second section comprising threads.

A medical product, preferably for use in treating, in particular filling and/or closing a bone cavity, wherein the product comprises a plurality of interconnected members, wherein each member has a peripheral boundary and the boundaries of adjacent members engage with one another. And a method for producing a medical product, preferably for use in treating, in particular filling and/or closing a bone cavity, wherein the product comprises a plurality of interconnected members, wherein each member has a peripheral boundary and the boundaries of adjacent members engage with one another.

Stemless components and fracture stems for joint arthroplasty, such as shoulder arthroplasty, are disclosed. Also, methods and devices are disclosed for the optimization of shoulder arthroplasty component design through the use of medical imaging data, such as computed tomography scan data.

The present invention involves a system and methods for assembling and implanting a vertebral body implant. The vertebral body implant includes, but is not necessarily limited to, an expandable core body and endplates that can be attached at both ends. End plates of various shapes, sizes and angles are attachable to the expandable core in a plurality of positions so that a suitable vertebral body implant can be implanted between vertebrae from an anterior, anterior-lateral, lateral, posterior or posterior-lateral approach.

Stemless components and fracture stems for joint arthroplasty, such as shoulder arthroplasty, are disclosed. Also, methods and devices are disclosed for the optimization of shoulder arthroplasty component design through the use of medical imaging data, such as computed tomography scan data.

Implants for the fusion or fixation of two bone segments are described. For example, the implants can be used for the fusion or fixation of the sacroiliac joint. The implants can include fenestrations, have a rectilinear overall cross-sectional area, and have a curvature. Some implants can also be used to rescue failed implants.

A stemless prosthetic shoulder joint may include a prosthetic humeral head and a stemless base. The stemless base may include a collar and an anchor extending from the collar intended to anchor the base into the proximal humerus. The base may include a proximal collar having a proximal surface and a bone-engaging surface opposite the proximal surface. The collar may have a superior portion and an inferior portion, the superior portion defining an arc shape and the inferior portion defining a substantially triangular shape.

Implants for the fusion or fixation of two bone segments are described. For example, the implants can be used for the fusion or fixation of the sacroiliac joint. The implants can include fenestrations, have a rectilinear overall cross-sectional area, and have a curvature. Some implants can also be used to rescue failed implants.

An implant constituted of: a body exhibiting a longitudinal axis; proximal arms extending from the body, each of the proximal arms extending in a respective direction and exhibiting a respective acute angle with the longitudinal axis, the body positioned between the proximal arms; distal arms extending from the body, each of the distal arms extending in a respective direction and exhibiting a respective acute angle with the longitudinal axis, the respective directions of extension of the distal arms generally opposing the respective directions of extension of the proximal arms, the body positioned between the distal arms; and intermediate arm assemblies extending from the body, each of the intermediate arm assemblies extending in a respective direction rotated about the longitudinal axis from the respective extension directions of the proximal arms and exhibiting a respective acute angle with the longitudinal axis, the body positioned between the intermediate arm assemblies.