Porous Bone Backing Implant for Joint Revision
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Solution Overview
Problem
In joint revision surgeries, especially total hip replacement arthroplasty, there is a challenge in maintaining bone stock and ensuring proper integration of implants due to bone loss and voids between the implant and the pelvic bone, which existing stiff metal backings exacerbate by causing stress shielding and uneven stress distribution.
Innovation Solution
An osteoconductive backing implant is designed, comprising a disc or sheet with slits and perforations, made from demineralized bone particles, that can be shaped to fit the joint surface, preventing bone graft from falling through voids and promoting bone integration by being osteoconductive and possibly osteoinductive, enhancing bone healing and bony integration of cementless implants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If stiff metal backings are used in joint revision surgeries, then mechanical strength and implant stability are improved, but stress shielding and uneven stress distribution occur causing bone loss
Solution Approach 1:
The patent changes the mechanical parameters of the backing implant by using porous金属材料 with controlled porosity (30-70%) and elastic modulus matching bone tissue, transforming the backing from a stiff metal structure to a compliant porous structure that allows stress transmission while maintaining structural integrity
Solution Approach 2:
The patent employs composite material structure combining porous金属材料 with bone graft material, creating a composite backing system that provides both mechanical support and osteoconduction, resolving the contradiction between needing structural strength and avoiding stress shielding
2Reliability
If bone graft material is used to fill voids between implant and pelvic bone, then bone integration is improved, but bone graft falls through voids and defects
Solution Approach 1:
The patent uses porous金属材料 as the backing structure with interconnected pores that physically retain bone graft material while allowing nutrient diffusion and vascular ingrowth, preventing graft loss through voids while maintaining osteoconductive properties
Solution Approach 2:
The porous backing implant acts as an intermediary barrier between the implant and pelvic bone, providing a scaffold that holds bone graft material in place while facilitating eventual bone integration through the porous structure
3Reliability
If demineralized bone matrix is used as backing implant, then osteoconduction and bone healing are improved, but mechanical strength compared to metal is reduced
Solution Approach 1:
The patent creates a composite system where DBM provides osteoconductive biological activity while porous金属材料 provides mechanical strength and structural support, combining the advantages of both materials to resolve the strength-deficiency of pure DBM
Solution Approach 2:
The patent applies different materials to different functional requirements: DBM is used where osteoconduction is needed (in contact with bone), while porous金属材料 provides mechanical support, creating local optimization of material properties throughout the backing structure
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 backing implant effectively holds bone graft material in place, encourages bone apposition, and facilitates bony integration of implants, reducing stress shielding and improving bone healing by conforming to irregular joint surfaces and acting as a barrier to prevent graft material from falling through defects.
Implementation Method 1
The backing implant may be formed of a material that is osteoconductive, and possibly, osteoinductive, to thus enhance bone healing
Implementation Method 2
DBM is an osteoinductive material, in that it induces bone growth when implanted in an ectopic site of a rodent, owing to the osteoinductive factors contained within the DBM
Data Source
AI summary
An osteoconductive backing implant for joint revisions is provided that may enhance bone healing and, for cementless implants, bony integration of the implant. The backing implant comprises a generally planar surface that may be formed into a generally hemispherical shape. In one embodiment, the backing implant comprises a disc having an inner hole and an outer edge, at least one slit extending from the inner hole to the outer edge. The disc may be formed from a coherent mass of elongate, mechanically entangled demineralized bone particles.