Artificial hip joint stem and artificial hip joint including the same

摘要

An artificial hip joint stem of the present invention includes a stem body divided into a stem proximal part, a stem distal part, and a stem intermediate part located between the stem proximal part and the stem distal part. The stem body includes a rough surface located at the stem proximal part and having a surface roughness (Ra) of 10-80 μm, a smooth satin surface located at the stem intermediate part and having a surface roughness (Ra) of 0.1-1.0 μm, and a shiny surface located at the stem distal part and having a surface roughness (Ra) of less than 0.1 μm. The present invention also provides an artificial hip joint including the artificial hip joint stem.

主权项

1. An artificial hip joint stem, comprising:
A stem body divided into a stem proximal part adapted to be located toward a femur end, a stem distal part adapted to be located toward a medial position in a femur, and a stem intermediate part located between the stem proximal part and the stem distal part, the stem body comprises a first surface located over an entire circumference of the stem proximal part and having a surface roughness (Ra) of 10-80μm, a second surface located over an entire circumference of the stem intermediate part and having a surface roughness (Ra) of 0.1-1.0μm, and a third surface located at the stem distal part and having a surface roughness (Ra) of less than 0.1μm, wherein the stem body further comprises a front surface, a rear surface and side surfaces each being located at the stem distal part, the side surfaces comprise a medial side surface and a lateral side surface opposed to each other, the third surface is located on the medial side surface and the lateral side surface, and the second surface extends from the stem intermediate part to a distal end of each of the front surface and the rear surface in areas located between and adjoining to the third surface on the medial side surface and the lateral side surface.