摘要:
A goniometer comprises a first arm (2), a second arm (4) and a connecting portion (6) pivotally connecting the first arm (2) to the second arm (4) about a pivot axis (7). An instrument connector (8) is coupled to the first arm (2) arranged to couple to a surgical instrument (10). A method of aligning a surgical instrument (10) using the goniometer is also disclosed.
摘要:
A kit for use in a procedure for implantation of an orthopaedic joint prosthesis includes a head component of an orthopaedic joint prosthesis, which comprises a body part having a convex bearing surface, and a reverse face at which the head component can be connected to a mating component of the joint prosthesis, in which the head component has a chamfer surface extending around at least part of its periphery where the bearing and reverse faces come together, and a plurality of markings on the chamfer surface. The kit includes a trial head component which comprises a body part having a convex trial bearing surface and a reverse face, in which the trial head component has a plurality of markings on the trial bearing surface at or towards the interface between it and the reverse face. The transverse dimensions of the head component are approximately the same as the transverse dimensions of the trial head component, and in which the location of the markings on the chamfer surface around the periphery of the head component corresponds to the location of the markings on the trial bearing surface of the trial head component around its periphery.
摘要:
An instrument for use in orthopaedic surgery for location of a reference point relative to a bone surface comprises a plate member (30) having at least two holes (36, 38) in it towards one end for receiving fasteners which can pass through the holes into the bone to fasten the plate member to the bone. A pivot rocker (40) is provided between the said holes, which protrudes from the face of the plate member which faces the bone surface when the plate member is positioned against a bone, and a reference point (44) is provided towards the opposite end of the plate member form the fastening holes which is spaced from the fastening holes in a direction parallel to the line which intersects the holes. The distance between the reference point on the plate member and the surface of the bone can be adjusted by moving the fastener in one of the fastening holes into the bone and moving the fastener in the other of the fastening holes out of the bone.
摘要:
A medical implant device comprises a substrate (10) having an undulating surface provided by peaks (12) which are separated by recesses (14). The device includes a porous coating layer provided on the undulating surface of the substrate which comprises a plurality of particles (16). The spacing between adjacent peaks on the surface of the substrate is less than the particle size of the particles. The particles are bonded to the peaks on the surface of the substrate and adjacent particles are bonded to one another.
摘要:
A method of determining the offset of the head part of an orthopaedic joint prosthesis stem component, relative to the neck of the stem part on which the head part can be fitted, involves obtaining a first and second images of the patient's joint on a non-coincident first and second planes. Template parts are fitted to the first and second images of the bone, which have markings (36, 42) on them which can be placed relative to the head part and the stem part respectively of the patient's bone, and scales (41) for measuring first and second displacements which are the distances between the axis of the head part and the axis of the neck of the patient's bone measured in the first and second planes. Reference data is used to calculate from the first and second displacements the r, ϑ coordinates of the axis of the head part relative to the axis of the neck of the stem part, where r is the absolute distance between the axis of the head part and the axis of the neck of the stem part, and ϑ is a measure of the angular location of the axis of the head part around the axis of the neck of the stem part.
摘要:
A connector for use in orthopaedic surgery for location of a surgical instrument relative to a reference point, comprises a plate member (30) having a reference point which can be fastened to the bone, and a connector rod (32) for connecting the surgical instrument (56) to the plate member. The connector rod is pivotally connected (44) to the plate member at about the reference point allowing relative pivotal motion between the connector rod and the plate member around at least one axis (46).