摘要:
A complete knee joint prosthesis having prosthetic condyles as a part of the femoral element, wherein the prosthetic condyles have a curvature in the shape of a circular arc in their rear part, and the femoral element has, between these prosthetic condyles, a convex cylindrical wall with an axis that coincides with the axis of the circle in which the rear parts of the prosthetic condyles lie. Glenoid cavities of an intermediate plate have corresponding rear parts in the shape of a circular arc and a corresponding concave bearing surface in the shape of a circular arc for pivotably receiving the prosthetic condyles. The tibial element has a cylindrical pin and the intermediate plate comprises a cavity which receives this pin to provide the possibility of multidirectional movement of the prosthetic knee joint.
摘要:
A template for use in matching parts (6, 8) of a modular joint prosthesis component to an image of a bone in which the prosthesis component is to be implanted, the prosthesis component including first and second parts (6, 8) which are fitted together to assemble the prosthesis component for implantation. The template comprises a first template part which bears an image of the first part of the prosthesis component, and a second template part which bears images of a plurality of the second parts (23) of the prosthesis component, each of the second parts (23) being a sleeve having a through bore in which, in the assembled prosthesis component, the first part (6) of the prosthesis component can be received. The second template part is connected to the first template part but can be moved relative to it so that the images of the second parts (23) of the prosthesis component can be aligned sequentially in relation to the image of the first template part (6) to form a composite image of the prosthesis component.
摘要:
The present invention concerns to a total knee prosthesis including a femoral implant having an anterior wall that forms the upper portion of a prosthetic trochlea and two curved branches extending from the lower edge of said anterior wall, delimiting the lower portion of the prosthetic trochlea between them and forming condylar surfaces between them. The trochlea has a middle furrow bordered by two rounded convex surfaces. The trochlea has in its upper portion a flexion of approximately 50°. The trochlea has a depth smaller than the height of the longitudinal middle rib comprised by the patella and has a width larger than that of that same rib, such that the patella comes into contact with the femoral implant essentially by that rib and said concave side faces are situated at a distance from said rounded convex surfaces. In the lower portion, the trochlea has a depth greater than the height of said rib and has a width substantially equal to that of said same rib, such that the patella comes into contact with the femoral implant essentially by said concave side faces, and said rib is at a distance from the bottom of the trochlea.
摘要:
A prosthesis whose condyles (3) have a spiral form, viewed in the saggital plane and the femoral element (1) has a medial lobe (6) with a curved surface. The medial plateau (2) has glenoid cavities (2b) for the condyles (3) and a medial prominence (5) which forms a posterior support surface (5a) against which the lobe (6) is supported in the course of movement of the joint. The glenoid cavities (2b) on the medial plateau (2) and the condyles (3) are congruent in extension and in the first part of the flexion movement of the joint. The posterior sections of the condyles (3) and the medial lobe (6) inscribe circles with the same centres and the medial lobe (6) contacts against the posterior support surface (5a) at the end of the first part of movement and then rests against the posterior support surface (5a) to perform a “roll-back”.
摘要:
A prosthesis whose condyles (3) have a spiral form, viewed in the saggital plane and the femoral element (1) has a medial lobe (6) with a curved surface. The medial plateau (2) has glenoid cavities (2b) for the condyles (3) and a medial prominence (5) which forms a posterior support surface (5a) against which the lobe (6) is supported in the course of movement of the joint. The glenoid cavities (2b) on the medial plateau (2) and the condyles (3) are congruent in extension and in the first part of the flexion movement of the joint. The posterior sections of the condyles (3) and the medial lobe (6) inscribe circles with the same centres and the medial lobe (6) contacts against the posterior support surface (5a) at the end of the first part of movement and then rests against the posterior support surface (5a) to perform a “roll-back”.
摘要:
An acetabular prosthesis (1) includes a hollow hemispherical artificial acetabular cup (2) having expansion slots distributed over its periphery, and provided with teeth (11n,=1-3) on the outer surface, a threaded intermediate element (3) and a plastic insert (4). The intermediate element (3) is a hollow core with an outer hemispherical surface capable of being urged in contact against at least an internal meridian generatrix of each segment defined between the slots; the inside part close to the orifice of the acetabular cup (2) has a thread wherein is screwed the intermediate core (3); the internal diameter of the acetabular cup (2) orifice of the acetabular cup (2) in reception position before the intermediate element (3) is screwed, is smaller than the external diameter of the intermediate element (3).