An Adaptive Late Stabilized Femoral Stem Prosthesis

Abstract

A self-adaptive later-period stable type femoral stem prosthesis comprises a femoral stem prosthesis near-end part and a femoral stem prosthesis far-end part, wherein the femoral stem prosthesis near-end part is a solid body; the femoral stem prosthesis far-end part is of a controllable porous structure; the transition area of the femoral stem prosthesis near-end part and the femoral stem prosthesis far-end part is a boundary part; the controllable porous structure is constructed through porous subunits in an array mode; the porosities of the porous subunits at different positions of the femoral stem prosthesis far-end part are different; and modeling of the femoral stem prosthesis far-end porous part is achieved by arraying the porous subunits. The femoral stem prosthesis can reduce the femoral stem far-end elastic modulus, can achieve self-adaptive deformation according to the loads and surrounding bone morphology when being planted, improves the contact degree of the prosthesis near end and surrounding bone, promotes transferring of the loads to the near-end femur, avoids near-end bone loss caused by stress shielding, and reduces risks of near-end looseness and sinking.

Description

technical field [0001] The invention belongs to the technical field of femoral stem prosthesis, and in particular relates to an adaptive late stage stable femoral stem prosthesis. Background technique [0002] The long-term proximal loosening of the artificial hip femoral stem after implantation is the most important factor limiting its service life. The reason for the long-term loosening of the proximal end is the stress shielding effect of the proximal end of the femoral stem prosthesis. The distal end of the femoral stem prosthesis is in close contact with the surrounding bone and forms a stable fixation. Difficulty conducting from the prosthesis to the proximal femur. According to Wolff's law, the bone will grow adaptively according to the stress environment in which it is located. When the stress borne decreases, it will cause bone loss, which will make the proximal end of the prosthesis lack effective support and cause proximal loosening. Once the prosthesis becomes ...

AI Technical Summary

Problems solved by technology

According to Wolff's law, the bone will grow adaptively according to the stress environment. When the stress borne decreases, it will cause bone loss, which will make the proximal end of the prosthesis lack effective support and cause proximal loosening.

Once the prosthesis becomes loose, revision surgery is required, and the lack of remaining bone mass due to bone loss further increases the difficulty of revision surgery

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