Partial Distal Femur Segmentation for Osteochondral Grafts
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Solution Overview
Problem
Existing methods for treating isolated articular chondral defects using allografts result in significant tissue waste and inability to repair the trochlear region effectively, as they involve cutting the distal femur into hemi-condyles, which do not provide an intact trochlear region and lead to further tissue loss.
Innovation Solution
The method involves obtaining and utilizing partial allograft femurs or condyles by cutting the distal femur into sections, such as three-cut or four-cut partial condyles, to create osteochondral implants that can be used to anatomically reestablish a structural load-bearing surface, allowing for efficient processing and utilization of graft material, including the trochlear region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the distal femur is cut into hemi-condyles for allograft transplantation, then the procedure can be performed with available graft material, but significant portions of the hemi-condyle are wasted and the trochlear region cannot be repaired
Solution Approach 1:
The distal femur is segmented into multiple partial condyles (lateral partial condyle, medial partial condyle, and trochlear partial condyle) through specific cutting planes. This segmentation allows each portion to be utilized for different repair needs, eliminating waste while maintaining the integrity of the trochlear region for anterior knee pathology repairs.
2Quantity of substance
If the distal femur is cut into hemi-condyles, then graft material can be obtained, but the trochlear region is not provided intact and requires whole distal femurs which results in further tissue loss
Solution Approach 1:
The distal femur is divided into three distinct segments: lateral partial condyle, medial partial condyle, and trochlear partial condyle. This segmentation strategy allows the trochlear region to be harvested as an intact graft for anterior knee pathology while the remaining condylar portions are preserved for other uses, eliminating the need to discard entire condyles.
Solution Approach 2:
Different regions of the distal femur are assigned different functions based on their anatomical characteristics. The trochlear region is designated for anterior knee pathology repair, while the condylar regions are preserved for other applications. This local quality approach ensures each region is utilized for its most appropriate indication, maximizing overall graft utility.
3Quantity of substance
If larger partial condyles are used, then more graft material is available, but processing and cleaning surface area is reduced
Solution Approach 1:
The distal femur is segmented into multiple smaller partial condyles rather than one large graft. This segmentation increases the total surface area available for processing and cleaning while providing sufficient graft material quantity. The smaller size of each partial condyle facilitates easier handling, cleaning, and preparation of the graft surfaces.
Data Source
AI summary
A method and apparatus for repairing isolated chondral defects using allograft implants. Lesions in articular tissue are corrected by forming a recipient socket in the tissue. A donor graft of a size corresponding to the recipient socket is harvested from a partial tissue specimen obtained from allograft material. The donor graft is implanted into the recipient socket.