Modular Bone Prosthesis With Porous Muscle Attachment Surface
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Solution Overview
Problem
Existing modular endoprostheses face challenges in achieving satisfactory muscle adhesion and power transmission due to the need for suturing, which causes trauma and stress concentration at suture points, leading to potential complications and reduced reliability.
Innovation Solution
A modular endoprosthesis design with a porous formation on the lateral side of the supporting body, specifically designed as an open-cell lattice structure, promotes direct muscle attachment, eliminating the need for suturing and enhancing force transmission by providing a targeted adhesion point for muscle tissue, particularly at the gluteus medius.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a closed surface is used on the end piece, then manufacturing is simpler and the structure is more compact, but muscle adhesion is insufficient and power transmission is reduced
Solution Approach 1:
The end piece features a differentiated surface structure with a closed surface on the medial side and a porous formation on the lateral side. This local quality variation allows the porous lateral surface to provide enhanced muscle adhesion and power transmission while the closed medial surface maintains structural integrity and simpler manufacturing characteristics.
2Reliability
If suturing is used to attach muscle to the end piece, then initial muscle attachment is achieved, but trauma and stress concentration occur at suture points leading to complications
Solution Approach 1:
The invention extracts and eliminates the suturing step from the muscle attachment process. By providing a porous formation that enables direct muscle ingrowth and attachment, the harmful suture points and associated trauma are completely removed from the system, resulting in more reliable and complication-free muscle attachment.
Solution Approach 2:
The lateral surface of the end piece is designed as a porous formation with open-cell lattice structure. This porous material allows muscle tissue to directly ingrow and attach to the implant surface, providing reliable muscle attachment without requiring sutures, thereby eliminating stress concentrations and trauma at suture points.
3Strength
If a porous coating is applied all around the end piece, then muscle adhesion is improved throughout, but the closed surface area is reduced and structural integrity may be compromised
Solution Approach 1:
Instead of applying porous coating uniformly around the entire end piece, the invention locally applies the porous formation only to the lateral surface while maintaining a closed surface on the medial side. This localized approach provides enhanced muscle adhesion where needed (lateral surface for gluteus medius attachment) while preserving structural integrity and sufficient closed surface area for other functional requirements.
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 design enables robust and reliable muscle attachment with reduced risk of complications, allowing faster patient mobilization and improved power transmission by promoting muscle ingrowth into the porous structure, thereby avoiding stress concentrations and enhancing biomechanical integration.
Implementation Method 1
the end piece has at least two differently designed surface formations on its supporting body—a closed surface on a medial side facing the neck part, and a porous formation of the surface on the lateral side facing away from the neck part
Data Source
AI summary
Modular endoprosthesis for at least partial replacement of a tubular bone, including, as module components, a stem for insertion into a bone cavity of the tubular bone, and an end piece including a support body with a neck part arranged on the medial aspect thereof. The module components being able to be coupled to each other and released from each other along a longitudinal axis of the shaft. The end piece has at least two different surface configurations on its support body, namely a closed surface (6′) on a medial aspect, and a porous configuration of the surface on the opposite, lateral aspect. The latter permits and positions the adhesion of muscle tissue, specifically without suturing. The muscle trauma caused by suturing, and the peak loads that occur at the respective suture points, can thus be avoided by virtue of the invention.