Instrumentation for implanting a cervical disc replacement device includes cervical disc replacement trials for determining the appropriate size of replacement device to be implanted, an insertion plate for maintaining the elements of the replacement device in fixed relation to one another for simultaneous manipulation, an insertion handle for attachment to the insertion plate for manipulation of the elements, an insertion pusher for releasing the insertion handle from the insertion plate, a drill guide that cooperates with the insertion plate to guide the drilling of tap holes for bone screws to be placed through bone screw holes in the flanges of the replacement device, clips that are applied to the flanges after placement of the bone screws to resist screw backout, and a clip applicator for applying the clips to the flanges.

Devices and methods are disclosed for joint replacement.

The present invention relates generally to a prosthetic spinal disc for replacing a damaged or degenerated disc between two vertebrae of a spine. The present invention also relates to prosthetic spinal disc designs that have either or both interlocking and magnetic components.

Implantable orthopedic pain management devices are disclosed, including a body with a top surface, a bottom surface, and at least two substantially parallel surfaces, the two substantially parallel surfaces having substantially similar radii of curvature and are substantially trapezoidally shaped, the top surface having a top radius of curvature and the bottom surface having a bottom radius of curvature, the body being configured to be disposed in a joint such that the surfaces are configured to be in intermittent contact with bone surfaces of one or more bones comprising the joint, the body not being coupled to the one or more bones, and a peripheral protrusion disposed substantially at an intersection of at least two surfaces, the peripheral protrusion being formed with the body, substantially spherical, and configured to prevent expulsion of the body from the joint.

Implantable orthopedic pain management devices are disclosed, including a body with a top surface having a radius of curvature, and a bottom surface with another radius of curvature, configured to be surgically implanted in a joint and to prevent contact between one or more bones in the joint, the body not being coupled to the one or more bones, and a peripheral protrusion disposed substantially about a perimeter of the body and having a substantially circular cross section, the peripheral protrusion being configured to prevent expulsion of the body from the joint.

In an orthopedic knee joint prosthesis, an intercondylar fossa of a femoral component cooperates with a spine formed in a tibial component to reproduce the screw home mechanism of a natural knee. When the femoral component and tibial component are positioned to correspond with slight flexion of the knee, the components are mutually rotationally locked against internal or external rotation. At higher degrees of flexion, such as greater than about 10-20 degrees of flexion, internal/external rotation of the tibia is permitted. The tibia is in an externally rotated position when locked, thereby reproducing the screw home mechanism and providing high stability.

A prosthetic ankle including a talar component and a tibial component. At least a portion of top surface of the talar component has a convex curvature, relative to a location above the top surface, in the anterior to posterior direction as viewed in a sagittal plane cross-section, and a concave curvature relative to a location above the top surface, in the medial to lateral direction. An axis of cone projected based on medial and lateral circles located in medial and lateral sagittal plane cross-sections which approximate the average radius of curvature of the top surface of the talar component as viewed in medial and lateral sagittal plane cross-sections, has a total offset angle from the lateral direction in the range of 0 to 45. In another aspect, the present invention further comprises a bearing component adapted for location between the tibial component and the talar component.

An articulation component (1, 100) is for a bone joint hemiarthroplasty implant having an intramedullary stem (50) with a socket (53). The articulation component has a proximal saddle (2, 110) for non-engaging abutment with a proximal bone and a ball (4, 104) for engaging in the stem socket (53). The saddle has a distally facing recessed surface (10, 110) for engagement with the stem proximally facing surface (55) to define limits of articulation, in one case a cone of motion of about 60 with minimal risk of socket dislocation. Also, the saddle has an enlarged lateral-most edge portion (11, 111, 211) on two diametrically opposed sides of the neck, for conformity with a patients' anatomy.

A prosthetic joint is secured to the bones forming the original joint by utilizing strictly mechanical fasteners, for example, a threaded rod engaging a tapped intramedullary canal. Cross locking members may be provided. The need for bone cement is avoided. The prosthetic joint may be used to replace one end of one bone forming the joint, utilizing the naturally occurring end of the other bone. Alternatively, both bone ends may be replaced with prosthetic joint portions. The decision to replace one or both bone ends may be made mid-surgery. The prosthetic joint portions are secured together utilizing ligament reconstruction members made from portions of the patient's tendons or allograft tendons. A bearing forming the interface between the two joint portions is designed to wear in order to protect the remaining components from wear, and to be easily replaced in relatively simple future surgeries.

This invention improves upon prior art total disc replacements (TDRs) by more closely replicating the kinematics of a natural disc. The preferred embodiments feature two or more fixed centers of rotation (CORs) and an optional variable COR (VCOR) as the artificial disk replacement (ADR) translates from a fixed posterior COR that lies posterior to the COR of the TDR to facilitate normal disc motion. The use of two or more CORs allows more flexion and more extension than permitted by the facet joints and the artificial facet (AF). AF joint-like components may also be incorporated into the design to restrict excessive translation, rotation, and/or lateral bending.