Abstract: A flat shaft of a hip-joint prosthesis for anchoring in a femur. The shaft expands on all sides towards a proximal end from a distal end of the shaft and medially merges with a curved section that is continuous with a prosthesis neck. The shaft is additionally expanded in a proximal region along a proximal direction on at least one of an anterior and posterior surfaces.

Abstract: The present invention relates in certain embodiments to components of a hip-joint prosthesis. More particularly, embodiments of the invention relate to a leaf-like femoral shaft for use as part of a hip-joint prosthesis, and instruments (e.g., a rasp) and methods for implanting the shaft. The shaft includes an anchoring section extending between a proximal region and a distal end of the shaft. The shaft has a cross-sectional contour that defines a lateral side, a medial side, an anterior side and a posterior side. A corresponding rasp is preferably provided for each femoral shaft. The rasp is inserted into the femur to form a cavity having generally the same configuration as the rasp. The shaft is configured to be over-dimensioned in at least one of the anterior-posterior direction and medial-lateral direction relative to the rasped femur cavity.

Abstract: Leaflike shaft (1) of a hip-joint prosthesis for anchoring in the femur, according to a towards a distal end (5), with a femur-anchoring section (1a, . . . 1i) having a long axis (A) and with a prosthesis neck (2), wherein the femur-anchoring section (1a, . . . 1i) has a substantially rectangular external contour in a plane perpendicular to the long axis (A), optionally with recesses in the side edges and/or at the corners.

Abstract: Leaflike shaft (1) of a hip-joint prosthesis for anchoring in the femur, according to a towards a distal end (5), with a femur-anchoring section (1a, . . . 1i) having a long axis (A) and with a prosthesis neck (2), wherein the femur-anchoring section (1a, . . . 1i) has a substantially rectangular external contour in a plane perpendicular to the long axis (A), optionally with recesses in the side edges and/or at the corners.

Abstract: The present invention relates in certain embodiments to components of a hip-joint prosthesis. More particularly, embodiments of the invention relate to a leaf-like femoral shaft for use as part of a hip-joint prosthesis, and instruments (e.g., a rasp) and methods for implanting the shaft. The shaft includes an anchoring section extending between a proximal region and a distal end of the shaft. The shaft has a cross-sectional contour that defines a lateral side, a medial side, an anterior side and a posterior side. A corresponding rasp is preferably provided for each femoral shaft. The rasp is inserted into the femur to form a cavity having generally the same configuration as the rasp. The shaft is configured to be over-dimensioned in at least one of the anterior-posterior direction and medial-lateral direction relative to the rasped femur cavity.

Abstract: Leaflike shaft (1) of a hip-joint prosthesis for anchoring in the femur, according to a towards a distal end (5), with a femur-anchoring section (1a, . . . 1i) having a long axis (A) and with a prosthesis neck (2), wherein the femur-anchoring section (1a, . . . 1i) has a substantially rectangular external contour in a plane perpendicular to the long axis (A), optionally with recesses in the side edges and/or at the corners.

Abstract: A profiled shaft for anchoring a hip-joint prosthesis in the femur is disclosed, with a shaft section and a fixation section that is formed at the end of the shaft section and that serves for the fixation of a spherical joint head, wherein the shaft section on the lateral surface in the proximal region merges with a trochanter wing at the edges of which beveled surfaces are formed. The essential point of the invention is that the angle formed between the plane of a beveled surface the plane of the adjacent surface is smaller than 135° and larger than 90°. In a construction of this kind the advantage of an improved filling of the empty space in the trochanter-wing region is achieved.

Abstract: Leaflike shaft (1) of a hip-joint prosthesis for anchoring in the femur, according to a towards a distal end (5) [sic], with a femur-anchoring section (1a, . . . 1i) having a long axis (A) and with a prosthesis neck (2), wherein the femur-anchoring section 1a, . . . 1i) has a substantially rectangular external contour in a plane perpendicular to the long axis (A), optionally with recesses in the side edges and/or at the corners.

Abstract: A profiled shaft for anchoring a hip-joint prosthesis in the femur is disclosed, with a shaft section and a fixation section that is formed at the end of the shaft section and that serves for the fixation of a spherical joint head, wherein the shaft section on the lateral surface in the proximal region merges with a trochanter wing at the edges of which beveled surfaces are formed. The essential point of the invention is that the angle formed between the plane of a beveled surface and the plane of the adjacent lateral surface is smaller than 135° and larger than 90°. In a construction of this kind the advantage of an improved filling of the empty space in the trochanter-wing region is achieved.

Abstract: Leaflike shaft (1) of a hip-joint prosthesis for anchoring in the femur, according to a towards a distal end (5) [sic], with a femur-anchoring section (1a, . . . 1i) having a long axis (A) and with a prosthesis neck (2), wherein the femur-anchoring section 1a, . . . 1i) has a substantially rectangular external contour in a plane perpendicular to the long axis (A), optionally with recesses in the side edges and/or at the corners.

Abstract: Leaflike shaft (1) of a hip-joint prosthesis for anchoring in the femur, according to a towards a distal end (5) [sic], with a femur-anchoring section (1a, . . . 1i) having a long axis (A) and with a prosthesis neck (2), wherein the femur-anchoring section 1a, . . . 1i) has a substantially rectangular external contour in a plane perpendicular to the long axis (A), optionally with recesses in the side edges and/or at the corners.

Abstract: Leaflike shaft (1) of a hip-joint prosthesis for anchoring in the femur, according to a towards a distal end (5) [sic], with a femur-anchoring section (1a, . . . 1i) having a long axis (A) and with a prosthesis neck (2), wherein the femur-anchoring section 1a, . . . 1i) has a substantially rectangular external contour in a plane perpendicular to the long axis (A), optionally with recesses in the side edges and/or at the corners.

Abstract: A profiled shaft for anchoring a hip-joint prosthesis in the femur is disclosed, with a shaft section and a fixation section that is formed at the end of the shaft section and that serves for the fixation of a spherical joint head, wherein the shaft section on the lateral surface in the proximal region merges with a trochanter wing at the edges of which beveled surfaces are formed. The essential point of the invention is that the angle formed between the plane of a beveled surface and the plane of the adjacent lateral surface is smaller than 135° and larger than 90°. In a construction of this kind the advantage of an improved filling of the empty space in the trochanter-wing region is achieved.

Abstract: Hip-joint endoprosthesis system with a plurality of, in particular leaflike, prosthesis shafts (1.1′, 1.2′) for anchoring in the femur, wherein each shaft expands substantially on all sides from a distal end (5) towards proximal and comprises an anchoring section with a shaft long axis (AS) that merges medially with an arch (7.1′, 7.2′) that continues into a prosthesis neck (9.1′, 9.2′) with a prosthesis-neck axis (AH), such that the shafts differ with respect to a reference-point distance (A1′, A2′, A3′) between the shaft long axis and a reference point (R1′, R2′, R3′) on the prosthesis neck axis, which identifies the position of the center point of a joint ball set onto the prosthesis neck, and such that that the length (l) of the projection of the overall extent of the prosthesis shaft from the distal end of the anchoring section to the reference point or to the proximal end of the prosthesis neck is the same in all prosthesis shafts.

Abstract: A shaft for a hip joint prosthesis is provided with a square cross-section in the distal region of the shaft. In addition, teeth are provided along each corner of the shaft to provide support on a cortical bone. At least some of other teeth are directed in the proximal direction to displace the osseous tissue rather thanto exert a cutting force on the osseous tissue. The angular stresses occurring when the shaft is inserted in a bone are reduced without the loss of the spaces between the sides of the shaft and bone for the growth of osseous tissue and a revascularization of the bone.

Abstract: The prosthesis is provided with a medial narrow side which extends on a hyperbola from a conical distal section to a boundary plane at which the blade is connected to the neck of the prosthesis. The vertex of the hyperbola is disposed at the point of intersection of the curved medial narrow side with the neck and a tangent to the hyperbola at the point of intersection with the distal section is one-half the conical angle of the blade.

Abstract: The prosthesis has a blade with a roof-ridge shaped shoulder at the proximal end adjacent to the neck. In addition, a bore is disposed in the shoulder on a medial plane so that a hook-shaped instrument can be inserted in to the bore from a direction of the neck. Movement and alignment of the blade via the insertion instrument is performed in the direction of the longitudinal axis of the blade.

Abstract: The prosthesis shank has a blade in which three predetermined points are designated. The points are formed as the centers of three bores which are formed in the shank in a triangular array. One bore is located on the longitudinal median axis while the other two bores are located on the pin axis. The points may also be determined by projections, depressions and or incisions. The designated points permit comparisons of x-ray pictures which are taken from time to time.

Abstract: The shank blade widens conically to all sides from a distal end to a point between 2/3 and 3/4 of the height of the shank. The upper portion of the blade is thinner and tapers to the collar. The shank avoids the so called "closure (final rotation" which is caused by too small a space for the shank blade in the neck of a femur bone. The shank blade has a generally rectangular cross-section with rounded corners to fit against the cortical bone tissue and has a trochanter wing to improve transmission of torque from the surrounding musculature to the hip joint.