Artificial hip joint with aspherical acetabulum

Abstract

The invention relates to an artificial hip joint with an aspherical acetabulum, comprising a non-spherical bearing curved-surface acetabulum prosthesis and a spherical femoral head prosthesis, wherein the non-spherical bearing curved-surface acetabulum prosthesis comprises an acetabulum external surface, an acetabulum cup opening plane is respectively connected with the acetabulum external surface and an acetabulum bearing curved surface, and the acetabulum bearing curved surface is an rotational ellipsoid curved surface obtained by rotating a long axis as a rotation axis by using a center line direction of left and right femoral heads as a long-axis direction and the up-and-down direction as a short-axis direction. When the two prostheses are in micro deviation in the walking process of a human body or the placement position of an acetabulum is improper during operation, the edge contact can be avoided; and compared with the traditional spherical joint, by adopting the artificial hip joint with the aspherical acetabulum, obtained by utilizing a finite element for calculation, contact stress can be reduced by 78.45% to the maximal degree, and although the contact stress is increased when micro separation is not generated, the increased range is not large. The artificial hip joint with the aspherical acetabulum reduces the contact stress, especially the contact stress of an external upper edge so that the abrasion of the external upper edge is further reduced so as to prolong the service life of the prostheses, and has the advantage of long service life.

Description

technical field [0001] The invention relates to the technical field of artificial joints, in particular to an aspherical acetabular artificial hip joint. Background technique [0002] The artificial hip joint is the largest mechanical product implanted in the human body, with more than 500,000 total hip replacements performed each year. The hip prosthesis replaces the patient's joint, relieves the patient's pain, and improves the patient's quality of life. The hip joint is a kinematic pair consisting of the acetabulum and femoral head prosthesis. Clinical studies have found that the wear of the spherical load-bearing curved acetabular prosthesis, especially the slight deviation between the femoral head prosthesis and the acetabular prosthesis during human walking or the placement of the acetabular prosthesis during surgery is unreasonable. Edge contact occurs at the edge, local high contact stress occurs, leading to early and obvious wear, and a second operation has to be ...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the above-mentioned shortcomings of the prior art, the object of the present invention is to provide an aspheric acetabular artificial hip joint, which is expected to solve the problem of obvious wear on the outer upper edge of the acetabulum after the artificial hip joint is implanted into the human body, and has a long service life. The advantages

Images