Abstract:
An acetabular prosthesis is described that includes a shell having an outer surface and an inner surface, the outer surface defining an external shape. There is at least one through bore extending from the outer surface of the shell to the inner surface of the shell. At least one augment is configured to be positioned at least partially within the at least one through bore of the shell such that, in an assembled state, the shell and the at least one augment define a modified external shape.
Abstract:
Methods and apparatus for orthopedic replacement of the hip through three incisions with a modular prosthetic system assembled in vivo while substantially preserving muscles and soft tissues around the hip joint resulting in reduced healing time and decreased risk of dislocation. A prosthetic femoral stem is inserted into the femur. A prosthetic femoral neck is inserted from a point along the side of the patient's body and into the side of the femur and through a lateral bore in the prosthetic femoral stem to join the prosthetic femoral head. The methods and apparatus include structures and techniques for fixing or enhancing interconnection of implant components, such as by increasing the interconnection in an interference fit with one or more tapers, threads, and/or cooling of components prior to assembly.
Abstract:
A prosthetic acetabular cup comprising a dome-shaped expandable shell having an annular rim portion (2) and an apex portion and a concave inner cavity extending therebetween for receiving a bearing liner; the shell further comprising an apex aperture (21) centrally disposed in the apex portion relative to a shell axis of rotation and a plurality of radially spaced slots (9) extending from proximal the rim portion to the apex aperture to define a plurality of shell segments expandable outwardly relative to the shell axis about a hinge portion connecting the segments together when an expanding force is applied at the aperture. The present invention provides a simple, correctable and mechanically stable means of inserting and securing a prosthetic acetabular cup in an acetabular bone cavity in a non- intrusive and precisely aligned manner. The present invention also provides a cup for cavities of different sizes/bone properties which further provides a stable and secure platform for an acetabular cup bearing liner to be mounted and secured in.
Abstract:
A prosthesis component 2 is disclosed, the component comprising a shell (2) formed form a carbon fibre reinforced polymer material and having an inner bearing surface (10); and a liner (6) formed from a ceramic material and having an outer bearing surface(12); wherein the liner (6) is received in an articulating manner within the shell (4). A hip replacement prosthesis is also disclosed, the hip replacement prosthesis comprising a prosthesis component (2) as disclosed and a femoral head prosthesis component (24), the femoral head prosthesis component being formed from a ceramic material.
Abstract:
An orthopedic instrument for installing a new reverse hip prosthesis, particularly the acetabular cup thereof, wherein the cup can be affixed to the pelvis with or without screws. The acetabular cup is releasably attached to the instrument and the instrument is used to position the cup in the pelvis. Optional screw guides are provided in the instrument in case the surgeon wishes to use screws to affix the cup to the pelvis.
Abstract:
Locking screw system includes screw and female threaded receiver that provide for and lock through interference fitting, which may be from major-major and/or minor-minor diameter interference. The system may be embodied as an orthopedic implant or implant component.
Abstract:
An insert (10) for an acetabular cup (12) comprises an insertion body (18) having an external surface (19) shaped so as to be able to be coupled with a mating seating (13) of the acetabular cup (12). The insert (10) comprises at least a friction element (20) which is positioned on the external surface (19) in order to determine a predefined friction with the surface of the seating (13), so that, during use, the friction element (20) prevents the relative rotation of the insertion body (18) and the acetabular cup (12).
Abstract:
Methods and apparatus using a surgical navigation system to position the femoral component of a prosthetic hip during hip joint replacement surgery without separately affixing a marker to the femur. The navigation system acquires the center of rotation of the hip joint as well as at least one point on the femur in the pelvic frame of reference. From these two points, the navigation system calculates the position and length of a first line between the center of rotation of the hip joint and the point on the femur. Optionally, a second point on the femur that is not on the first line is palpated. The system can calculate the position and length of a second line that is perpendicular to the first line and that runs from the first line to the second palpated point on the femur. The prosthetic cup is implanted and its center of rotation is recorded. A tool for forming the bore within which the stem of the femoral implant component will be placed is tracked by the navigation system. While the tool is fixed to the femur, the surgeon re-palpates the same point(s) on the femur that were previously palpated. The navigation system calculates the position and length of a first line between the center of rotation of the prosthetic cup and the re-palpated first point. If a second point on the femur was re-palpated, the navigation system also calculates the position and length of a perpendicular line between the first line and the second point. The surgical navigation system uses this information to calculate and display to the surgeon relevant information about the surgery, such as change in the patient's leg length and/or medialization/lateralization of the joint.
Abstract:
An endoprosthesis (4) for orthopedic applications comprising a prosthesis body suitable for interfacing between a first and a second bone at a first and a second wall (12, 14) respectively. The prosthesis body (8), at least one of said walls, comprises a fixing interface (30) suitable for favouring the osteo-integration with an associable bone, which is spaced from one of the walls of the prosthesis body by a plurality of spacer elements (38) for forming a meatus (42) between the interface and the wall, said meatus determining cavities and undercuts suitable for seating growing bony tissue. The fixing interface comprises a reticular structure having a plurality of meshes (48) integrally interconnected to each other and suitable for favouring the osteo-integration.
Abstract:
Die Erfindung betrifft eine modulare Revisionspfanne für die Hüftgelenkendoprothetik, welche entsprechend den intraoperativ im Acetabulum vorgefundenen Defekten während der Revisionsoperation angepasst werden kann. Die erfindungsgemäße modulare Revisionspfanne besteht aus einem Pfannengrundkörper, einer Befestigungslasche, einem oder mehreren Verankerungszapfen und einem Pfanneneinsatz. Der Pfannengrundkörper ist als ovaläre Pressfitschale geformt und hat zwei polyaxiale Spreizpressfitlager für Verankerungszapfen, ein Montagelager für eine Befestigungslasche sowie eine Aussparung zur Erweiterung der Bewegungsumfanges und Verhinderung von Impingment. Die Befestigungslasche ist in Blockmontage am Pfannengrundkörper befestigt. Durch ihre formschlüssige Montage werden Kippmomente im Montagelager aufgenommen und sichern eine hohe Stabilität des Implantats. Die Verankerungszapfen besitzen mehrere Funktionsbereiche. Ein Spitzenbereich dient zur Führung während des Eindrückens, ein Führungsbereich dient zur Verdrehsicherung und Kompression des spongiosen Knochens während des Einführens, ein Haltebereich sichert die mechanische Stabilität im Knochen und ein Kopfbereich dient zur Befestigung in der Revisionspfanne und ermöglicht die Arretierung in polyaxialer Ausrichtung.