Revision Hip Stem Sleeve for Greater Trochanter Fixation
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Solution Overview
Problem
During revision procedures for hip joint replacement, the exposure of the greater trochanter can lead to loosening and degradation of the revision femoral prosthesis due to incomplete reattachment, as traditional methods like wrapping cables or sutures are insufficient for stable fixation.
Innovation Solution
A femoral prosthesis with a sleeve that includes a porous exterior surface and flanges with apertures, facilitating the reattachment and ingrowth of the osteotomized proximal femur, specifically the greater trochanter, by providing a biocompatible surface for bone and tissue integration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional methods like wrapping cables or sutures are used to reattach the greater trochanter, then the reattachment procedure can be performed, but the fixation is insufficient leading to loosening and degradation of the revision femoral prosthesis
Solution Approach 1:
The sleeve is divided into multiple functional segments: a proximal portion with a porous exterior surface for bone ingrowth, and a distal portion with flanges containing apertures for cable/suture attachment. This segmentation allows each portion to perform its specific function optimally, providing both biological fixation and mechanical attachment
Solution Approach 2:
The proximal portion of the sleeve features a porous exterior surface that promotes bone and tissue ingrowth, creating a biological fixation mechanism that is more reliable than traditional cable wrapping alone. This porous structure allows osteointegration, significantly improving long-term fixation stability
2Ease of operation
If the greater trochanter is exposed superior to the proximal femur during revision procedure, then access is obtained for prosthesis removal, but the exposure leads to potential loosening and degradation of the revision femoral prosthesis
Solution Approach 1:
The sleeve is pre-formed with a porous exterior surface and attachment flanges before implantation. This preliminary preparation allows the surgeon to immediately attach the greater trochanter to the sleeve's porous surface using cables or sutures through the apertures, ensuring proper positioning and stable fixation from the outset rather than attempting attachment after prosthesis implantation
Solution Approach 2:
The sleeve acts as an intermediary structure between the revision femoral prosthesis and the greater trochanter. It provides a stable interface that allows secure attachment of the osteotomized greater trochanter while maintaining the integrity of the prosthesis, preventing direct stress transmission that could cause loosening
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The femoral prosthesis with a sleeve enhances the stability and integration of the greater trochanter, preventing loosening and degradation by promoting bone and tissue ingrowth, thereby ensuring a secure reattachment and improved fixation.
Implementation Method 1
the sleeve includes a porous exterior surface, at least a portion of the porous exterior surface promoting ingrowth of the osteotomized proximal femur with the sleeve
Data Source
AI summary
The present disclosure provides a femoral prosthesis for use during a revision procedure. The femoral prosthesis includes a body, a neck, a stem, and a sleeve. The sleeve facilitates reattachment of an osteotomized proximal femur, specifically the greater trochanter, following a revision femoral prosthesis surgery involving an extended trochanteric osteotomy. Additionally, the sleeve promotes ingrowth of the osteotomized proximal femur with the sleeve.