Blade-like stem of a hip-joint prosthesis

A hip joint prosthesis stem for anchoring in a femur, comprising:

• a prosthesis neck portion;
• and
• a femur-anchoring portion extending from the prosthesis neck portion and having a proximal end, a distal end, and a total length extending from the proximal end to the distal end, the femur-anchoring portion tapering towards the distal end, the femur-anchoring portion comprising a lateral narrow side comprising a distal straight portion extending from a location adjacent the distal end and a proximal arcuate portion extending from the distal straight portion to a location adjacent the proximal end, the proximal arcuate portion having a radius of curvature that becomes increasingly smaller in a distal-to-proximal direction.

A hip joint prosthesis stem for anchoring in a femur, comprising:

• a prosthesis neck portion;
• a femur-anchoring portion extending from the prosthesis neck portion and having a proximal end, a distal end, and a total length extending from the proximal end to the distal end, the femur-anchoring portion tapering towards the distal end, the femur-anchoring portion comprising a lateral narrow side comprising a distal straight portion extending from a location adjacent the distal end and over a length of from 60% to 75% of the total length, the lateral narrow side further comprising a proximal arcuate portion extending from the distal straight portion to a location adjacent the proximal end of the femur-anchoring portion, the proximal arcuate portion having a radius of curvature that becomes increasingly smaller in a distal-to-proximal direction, and wherein the proximal arcuate portion extends over a length of the femur-anchoring portion of from 25% to 40% of the total length.

A hip joint prosthesis stem for anchoring in a femur, comprising:

• a prosthesis neck portion;
• a femur-anchoring portion extending from the prosthesis neck portion and having a proximal end, a distal end, and a total length extending from the proximal end to the distal end, the femur-anchoring portion tapering towards the distal end, the femur-anchoring portion comprising a lateral narrow side comprising a distal straight portion extending from a location adjacent the distal end and over a length of from 60% to 75% of the total length, the lateral narrow side further comprising a proximal arcuate portion extending from the distal straight portion to a location adjacent the proximal end of the femur-anchoring portion, the proximal arcuate portion having a radius of curvature that becomes increasingly smaller in a distal-to-proximal direction, and wherein the distal straight portion merges tangentially into the proximal arcuate portion.

A hip joint prosthesis stem for anchoring in a femur, comprising:

• a prosthesis neck portion;
• a femur-anchoring portion extending from the prosthesis neck portion and having a proximal end, a distal end, and a total length extending from the proximal end to the distal end, the femur-anchoring portion tapering towards the distal end, the femur-anchoring portion comprising a lateral narrow side comprising a distal straight portion extending from a location adjacent the distal end and over a length of from 60% to 75% of the total length, the lateral narrow side further comprising a proximal arcuate portion extending from the distal straight portion to a location adjacent the proximal end of the femur-anchoring portion, the proximal arcuate portion having a radius of curvature that becomes increasingly smaller in a distal-to-proximal direction, and wherein the radius of curvature of the proximal arcuate portion continuously changes in the distal-to-proximal direction from the distal straight portion to the location adjacent the proximal end of the femur-anchoring portion.