摘要:
The hip joint socket is provided with a peripheral edge or flange in which a plurality of bores are formed. Each bore narrows conically from one side of the peripheral edge towards the free surface of the socket to provide outflow paths for excess bone cement which is displaced during implanting of the socket in a pelvis. The construction in the bores also permits the excess cement to harden into a rivet-like plug to increase the securement of the hip joint socket in the cement bed.
摘要:
A prosthetic hip joint comprises a femoral element formed with a ball head and a stem projecting from the head and adapted to be received within the upper end of a femur, and a generally hemispherical socket element adapted to be secured in the ilium at the acetabulum thereof and having an inner surface formed as a generally hemispherical cavity adapted to snugly receive the ball head. The outer surface of the socket element is subdivided at a step into a lower quarter-spherical region having a center of curvature lying above the center of curvature of the ballreceiving cavity, and an upper quarter-spherical region adjoining the lower region and having a center of curvature coinciding with the center of curvature of the ball-receiving cavity. The step between the two quarter-cylindrical regions is formed with a chamfer and both of these regions are formed with a plurality of criss-crossing grooves, in at least one of which is received a metal wire allowing the synthetic-resin socket element to be viewed in an X-ray. The ball head of the femoral element is formed with a neck that is tapered into the stem and forms a pair of shoulders thereon.
摘要:
An acetabular shell for use in a hip prosthesis is provided. The shell includes a body having an inner periphery and a convex outer periphery and defining a cavity of the body. The outer periphery has a first portion defining a hemisphere and a second portion extending from the equator of the first portion in a converging direction. The second portion forms a rim opposed to the equator. The cavity is positioned within the rim.
摘要:
A total hip prothesis comprises a cotyloid implant consisting of a metal cup to be anchored in the acetabulum, a polyethylene insert which provides an intermediate implant inserted into the cavity of the cup, and a femoral implant consisting of a cap having an outer convex surface which is slidably positionable within the insert cavity. An inner concave surface of the femoral implant is implantable on the head of the femur. The prothesis is particularly suitable for endo-articular implantation.
摘要:
An implantable prosthesis comprises a polyethylene prosthetic member that is substantially transparent to x-rays and a radiographic marker that is substantially opaque to x-rays. The radiographic marker is configured as a tension spring arranged as a continuous ring encircling the prosthetic member.
摘要:
An acetabular cup assembly includes a metal shell component and a plastic bearing insert capable of assembly interoperatively, the metal shell component first being secured in position within an acetabulum and then the plastic bearing insert being receivable within the shell component, first at a preliminary axial position for ascertainment of the circumferential position of the bearing insert and the orientation of the bearing face of the bearing insert relative to the shell component and then at a fully-seated axial position wherein the bearing insert is permanently captured in the shell component, the bearing insert being readily withdrawn from the preliminary axial position for circumferential repositioning to attain appropriate orientation of the bearing face prior to capturing the bearing insert within the shell component.
摘要:
An artificial hip joint socket made of plastic is intended to be installed in the pelvic bone without bone cement. The hip joint socket comprises a ribbed outer surface which permits good engagement of the bone tissue as well as two anchor plugs protruding from the outer surface which are intended to be inserted into corresponding bores in the bone. The angle which the plugs form with the socket surface deviate from the angle which the bores form with the socket surface by about 5.degree. in order to effect a predetermined prestressing action which restrains the hip joint socket in position. Furthermore, the hip joint socket comprises at least two barb-like anchor flaps on its outer surface which either lie opposite one another or mutually include an angle of between 120.degree. and 150.degree.. A good seating of the hip joint socket in the bone is ensured by these flaps even immediately after insertion of the hip joint socket. Thus, even if the anchor plugs offer insufficient retention for any reason, the employment of screws or dowels can be completely or partially foregone.
摘要:
An improved spherical kinematic joint which allows ease and convenience of assembly and disassembly, particularly assembly, by providing a plurality of substantially physically distinct bearing inserts in a sub-assembly such that the bearing inserts are effectively a unitary structure for the purpose of assembly and disassembly but which bearing segments expand easily with low manual force during assembly and disassembly of the various bearing insert embodiments from the head and/or cavity or spherical seat in another joint element or member, such as for example in the prosthetic joint embodiments, an acetabular cup. Further, such ease of assembly and disassembly can be accomplished while retaining great dislocation and separation resistance and can be accomplished in a manner which does not introduce significant axial play.
摘要:
An artificial hip joint having an acetabulum prosthesis for the cotyloid cavity defining a socket and including a head having a plurality of blades extending outwardly away from the socket for engaging the prepared wall of the cotyloid cavity and having at least one insert removably connected to the head to form the socket. A prosthesis of the head of the femur is movably interconnected with the acetabulum prosthesis and includes a pin to be driven into the bone-marrow channel of the femur, a curved neck integral with the pin, and a hip ball positioned on the neck, movably located within the socket and in movable contact with the removable insert. Means are provided in operative relationship with the femur head prosthesis for preventing rotation of the femur head prosthesis with respect to the femur.