Bendable Osteochondral Allografts with Grooved Bone
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Solution Overview
Problem
There is a limited supply of osteochondral grafts that perfectly fit individual joint sites, and existing techniques fail to provide durable, customizable osteochondral grafts, especially for joints like the thumb CMC joint, which requires specific anatomy to maintain natural motion and function.
Innovation Solution
A customized osteochondral allograft with an uninterrupted cartilaginous layer and grooved subchondral bone that can be bent to match the host site's curvature, using 3D scanning and finite element modeling to determine the optimal groove pattern and geometry for bending, ensuring mechanical integrity and cell viability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If an osteochondral graft is harvested from a donor joint, then cartilage and bone tissue are available for transplantation, but the graft geometry rarely matches the host site anatomy
Solution Approach 1:
The graft is divided into multiple segments or blocks that can be individually shaped and reconfigured. This segmentation allows the graft to be customized to match the specific geometry of the host site while maintaining adequate tissue volume for transplantation.
Solution Approach 2:
Different regions of the graft are customized to have specific geometric properties matching the local requirements of the host site. The graft geometry is tailored locally rather than using a uniform shape, enabling precise anatomical matching while preserving sufficient tissue quantity.
2Shape
If the graft geometry is customized to match the host site, then anatomical fit is improved, but the structural integrity and mechanical strength may be compromised
Solution Approach 1:
The graft geometry is pre-planned and pre-shaped using computational modeling and 3D printing templates before transplantation. This preliminary customization allows optimization of both anatomical fit and structural strength by simulating mechanical loads and adjusting the geometry accordingly before the actual surgery.
Solution Approach 2:
The graft geometry parameters (curvature, thickness, contour) are systematically adjusted based on host site measurements and mechanical requirements. By changing geometric parameters in a controlled manner, the graft achieves custom fit while maintaining adequate structural integrity to withstand physiological loads.
3Ease of operation
If standard osteochondral grafts are used, then the transplantation process is simple, but the grafts do not maintain natural joint motion and function
Solution Approach 1:
The host site anatomy is digitally scanned and copied to create a precise 3D model. This digital copy is then used to design and fabricate a custom graft that replicates the natural joint geometry, enabling the graft to maintain natural joint motion and function while using standardized customization workflows.
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
This approach increases the applicability and effectiveness of osteochondral transplantation by matching the natural anatomy of the host site, reducing waste, and maintaining joint function, even when donor sites are from different anatomical locations, thereby addressing the limited supply and fit issues of existing grafts.
Implementation Method 1
The bone portion has one or more grooves that allows for bending and conformation of the allograft to match a host site
Data Source
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Figure 1B
Figure 2
AI summary
A customized osteochondral graft comprising an uninterrupted cartilaginous layer having a first surface disposed on a bone portion to the first surface of the cartilaginous layer, the bone portion having one or more grooves; wherein the customized graft is bendable into a shape that conforms to a host site. The graft is suitable for allografting of an articular joint, including the thumb.