Porous Bone Insert Augment with Cement Barrier
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Solution Overview
Problem
Existing bone implant devices face challenges in securely attaching to sclerotic bone, where the cement does not interdigitate or penetrate effectively, leading to implant fixation failures under high repetitive forces.
Innovation Solution
The development of a bone insert with a highly porous cap and stem structure, featuring a barrier to prevent cement flow into the stem, and textured surfaces to promote bone ingrowth, which enhances the bonding strength between the bone implant and the bone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a solid metal bone augment spacer device is used to adjust position, then the implant can be securely fixed to the bone, but the cement does not interdigitate or penetrate the bone effectively, leading to fixation failure under high repetitive forces
Solution Approach 1:
The bone insert is constructed with a highly porous structure featuring interconnected pores and channels throughout the body. This porous architecture enables the cement to penetrate and interdigitate with the bone insert, creating mechanical interlocking that significantly improves cement-bone bonding strength and resistance to repetitive forces, directly resolving the fixation reliability issue.
Solution Approach 2:
The invention creates a composite construct comprising the bone insert, cement, and host bone. The bone insert serves as a reinforcement framework within the cement-matrix, forming a composite structure where the cement fills the porous spaces and bonds to both the bone insert and host bone, achieving superior mechanical strength and interdigitation compared to conventional solid implants.
2Ease of manufacture
If liquid PMMA cement is applied to contact areas of the bone and implant, then the cement can secure the implant to the bone, but the cement does not penetrate sclerotic bone effectively, resulting in insufficient fixation
Solution Approach 1:
The highly porous structure of the bone insert provides numerous channels and voids that facilitate cement penetration. The cement flows into and bonds with the porous framework, creating mechanical interlocking that enables effective penetration even into sclerotic bone, transforming the cement application from a surface-level process to a deep mechanical interdigitation.
3Strength
If a solid metal screw device is used to adjust position, then the implant can be fixed to the bone, but the device lacks bone ingrowth surfaces and cannot stabilize the cement mantle
Solution Approach 1:
The porous structure of the bone insert provides extensive surface area and interconnected channels that promote bone ingrowth. The bone can grow into the porous framework over time, creating biological integration, while the same porous architecture provides anchoring points for the cement mantle, enabling the device to simultaneously provide mechanical fixation and biological adaptability.
4Reliability
If the bone insert has a highly porous structure, then the cement can interdigitate and penetrate effectively, but the structural complexity increases
Solution Approach 1:
While the porous structure does increase manufacturing complexity, it enables effective cement interdigitation and penetration. The interconnected pore network provides multiple pathways for cement flow and mechanical interlocking, creating reliable bonding that justifies the additional structural complexity through superior clinical performance.
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 bone insert improves the stability of the cement mantle, reduces the risk of implant failure, and promotes bone ingrowth, creating a stronger composite construct that resists cyclic loading and pullout.
Implementation Method 1
the bone insert also interdigitates with the cement in securing the bone insert to the cement, while the interdigitation with the cement produces a composite construct that resists breakdown at the cement insert interface with cyclic loading
Implementation Method 2
textured surfaces to promote bone ingrowth, which enhances the bonding strength between the bone implant and the bone
Implementation Method 3
a barrier to prevent cement flow into the stem
Data Source
AI summary
A bone insert includes a cap having a convex top surface, an elongated stem, and a barrier between the cap and the stem. The stem of the bone insert is inserted into a hole formed in a host bone until the barrier is pressed against the exposed bone. The bone implant can be placed against a small focus contact point on the cap. Liquid cement can be injected into a space volume between the host bone and a bone implant. The cap can be made of a material and/or have surface features that create a strong bond with the cement when the liquid cement cures. The stem can be made of a material and/or have bone ingrowth surface features that create a strong bond with the bone.