Abstract: An orthopaedic prosthetic system includes a plate having one or more flanges and an acetabular shell component. Each flange includes a surface configured to engage a patient's bone. The plate also includes a central ring that engages a lip extending from an outer surface of the shell component. The ring may be mechanically attached to the lip using multiple fasteners. The system may include multiple plates each having a different configuration from other plates, and may also include multiple shell components each having a different configuration from other shell components. Methods for assembling and using the prosthetic system are also disclosed.

Abstract: A method of implanting a medical implant comprises the steps of reaming a tapered bore to a first depth and a counter bore, coaxial to the tapered bore, to a second depth less than the first depth in a long bone. The counter bore has a larger diameter than the tapered bore. The method further includes inserting a medical implant into the tapered bore and counter bore. The medical implant includes a stem and a collar disposed around a portion of the stem. Inserting the medical implant include fully seating a portion of the stem into the tapered bore to form a press-fit between the stem and the long bone. The collar may be moved into the counter bore to a depth less than the second depth.

Abstract: A femoral prosthesis for use during performance of a hip replacement procedure includes a plurality of femoral stem components in a range of various sizes and a plurality of femoral head component in a range of various sizes. The anterior/posterior stem taper angle of the femoral stem component varies across its range of sizes.

Abstract: A femoral implant for fitting to a resected femur comprises a section having a frustoconical external form, a stem part extending away from the section to a distal end of the implant, and a femoral head extending directly away from the section to the proximal end of the implant. The implant could have the femoral head integral with the section, or as a separate component secured thereto, with the stem being a separate one piece component incorporating the section.

Abstract: An implant stem (1, 2) for implantation in a femur, comprising: a base portion (3) disposed at the proximal end (4) of the stem and a stem portion (5) extending to the distal end (6) of the stem, wherein the base portion (3) has an engagement means (7) for engaging, in use, with the resected end of the femur. An implant comprising such a stem (1, 2) and a head. A method for implanting such implants in a femur.

Abstract: A femoral prosthesis for use during a revision procedure includes a proximal body, a distal stem, a modular neck, and a head. In operation, a surgeon may stabilize the proximal body and the distal stem of the prosthesis in a patient's femoral canal that has moderate loss of metaphyseal cancellous bone (known as a Paprosky Type I femoral defect), extensive loss of metaphyseal cancellous bone (known as a Paprosky Type II femoral defect), or extensive metaphyseal deterioration and some diaphyseal deterioration (known as a Paprosky Type IIIA femoral defect). Without disturbing this arrangement, the surgeon may then position the head in a desired location by selecting a desired modular neck to obtain proper joint kinematics.

Abstract: A femoral prosthesis has a stem part and a head part, in which the stem part has a body section for location in the femur of a patient and a neck section including a trunion or spigot. The head part has a bearing surface formed as part of a sphere and a reverse side. The bearing surface has a polar axis extending through a center of the sphere formed thereby. A bore is provided in the reverse side adapted to receive the spigot wherein the bore comprise a bore axis, and in which the bore axis is oblique to the polar axis.

Abstract: A femoral implant for fitting to a resected femur comprises a section having a frustoconical external form, a stem part extending away from the section to a distal end of the implant, and a femoral head extending directly away from the section to the proximal end of the implant. The implant could have the femoral head integral with the section, or as a separate component secured thereto, with the stem being a separate one piece component incorporating the section.

Abstract: A trial head and shell for use in trial reduction of hip implants, and particularly bipolar implants, having locking features that prevent the head from dissociating from the shell during trialing, yet which allow the head and shell to be readily assembled and disassembled in the operating room. A cut-out region is formed in an outer bearing surface of the head. The cut-out region allows the head to pass through a trial shell opening and into the shell, yet is oriented such that when the head is associated with a femoral neck, the head cannot disassociate from the shell. Orientation indicators can be provided for use in assembly and disassembly. The trial head and associated shells can be provided in the form of a surgical kit including hip implants. Methods of use are provided.

Abstract: Methods and apparatus of the present invention provide for orthopaedic replacement of the hip while substantially preserving muscles and soft tissues around the hip joint resulting in reduced healing time and decreased risk of dislocation following the procedure. In an exemplary embodiment, an intramedullary rod 1502 is inserted longitudinally into the femur. A prosthetic femoral neck 3102 is then inserted from a point along the side of the patient's body and into the side of the femur and through a pre-existing lateral bore in the intramedullary rod 1502 and through the remainder of the femur to join the prosthetic femoral head 1102. The methods and apparatus include structures and techniques for fixing the prosthetic femoral neck 3102 in relation to the intramedullary rod 1502.

Abstract: A femoral implant for fitting to a resected femur comprises a section having a frustoconical external form, a stem part extending away from the section to a distal end of the implant, and a femoral head extending directly away from the section to the proximal end of the implant. The implant could have the femoral head integral with the section, or as a separate component secured thereto, with the stem being a separate one piece component incorporating the section.

Abstract: In one embodiment of the present invention a prosthesis including a mechanism for attaching a first component to a second component is provided. In one example (which example is intended to be illustrative and not restrictive), the first component may be a femoral head component and the second component may be a femoral stem component. In another example (which example is intended to be illustrative and not restrictive), the femoral head component may comprise a ceramic material and the femoral stem component may comprise a metallic material (e.g., any desired orthopedic alloy, such as Cobalt Chromium).

Abstract: A femoral implant for fitting to a resected femur comprises a section having a frustoconical external form, a stem part extending away from the section to a distal end of the implant, and a femoral head extending directly away from the section to the proximal end of the implant. The implant could have the femoral head integral with the section, or as a separate component secured thereto, with the stem being a separate one piece component incorporating the section.

Abstract: A femoral implant for fitting to a resected femur comprises a section having a frustoconical external form, a stem part extending away from the section to a distal end of the implant, and a femoral head extending directly away from the section to the proximal end of the implant. The implant could have the femoral head integral with the section, or as a separate component secured thereto, with the stem being a separate one piece component incorporating the section.

Abstract: A hip joint prosthesis that has a strap plate and a hollow, tapered femoral neck subassembly. The femoral neck includes a flanged force plate that radiates from a head stem base and abuts the femur. Several longitudinal ridges and/or an annular recess or other surface treatment at the head stem base facilitates retention in the femur. Shaped surfaces of a femoral neck at the strap plate interlock in non-rotational engagement with a bore of the head stem base. A tapered stem projects from the force plate and supports a ball head. The strap plate includes laterally and longitudinally displaced elongated fastener holes and stress relieving recesses and/or channels. Fasteners anchor the strap plate to the femoral shaft. A shouldered bolt mounts through the femoral neck to engage the ball head base and draw the ball head base and ball head toward the strap plate and contain the prosthesis to the femur.

Abstract: In one embodiment of the present invention a prosthesis including a mechanism for attaching a first component to a second component is provided. In one example (which example is intended to be illustrative and not restrictive), the first component may be a femoral head component and the second component may be a femoral stem component. In another example (which example is intended to be illustrative and not restrictive), the femoral head component may comprise a ceramic material and the femoral stem component may comprise a metallic material (e.g., any desired orthopedic alloy, such as Cobalt Chromium).

Abstract: In a joint prosthesis the head cap is connected via a collar piece to the shaft piece which may be anchored in the bone. The collar piece is coupled to the shaft piece by a joint head in a ball-jointed manner. The articulation surfaces between the joint cavity in the shaft piece and the articulation head on the collar piece are embodied such that on pressing the articulation head to the base of the joint cavity, edges or projections on the one articulation surface digs into the other articulation surface lying on a virtual spherical surface. It is thus possible to achieve a ball-joint like articulation, whereby the spherical surfaces may have a relatively large production tolerance without the above affecting the clamping connection between the articulation surfaces.

Abstract: A femoral implant for fitting to a resected femur comprises a section having a frustoconical external form, a stem part extending away from the section to a distal end of the implant, and a femoral head extending directly away from the section to the proximal end of the implant. The implant could have the femoral head integral with the section, or as a separate component secured thereto, with the stem being a separate one piece component incorporating the section.

Abstract: The invention relates to a femoral neck prosthesis having a spherically shaped head (1), by which a centre (2) of a sphere is defined, and having a stem (3) which extends from the level of the centre (2) of the sphere along a centre line (4) over a length (L) up to a distal end (5). Since the stem has a modulus of elasticity E of between 10 GPa and 60 GPa, since the length L lies between 50 mm and 150 mm and since the equivalent stiffness S=E L formed from the product of the modulus of elasticity E and the length L lies between 0.5·109 and 9·109 [Newton/metres], the stem behaves similarly to the bone material itself and the shear strains between the stem and the bone material are kept low.