Osteochondral Graft Segmentation for Knee Defect Precision
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Solution Overview
Problem
Current osteochondral autograft transplantation methods face challenges in precisely fitting grafts into defects due to size discrepancies, leading to voids or spaces between grafts, which affects the healing of damaged articular cartilage in the knee joint.
Innovation Solution
A surgical apparatus with a solid cylindrical anchor and adjustable cutting device allows for the precise cutting of grafts to match the defect's dimensions, ensuring a tight fit by creating circular openings with pie-shaped sections, facilitating the alignment and implantation of grafts with minimal spacing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If grafts are cut to match defect dimensions, then fit precision is improved, but graft harvesting complexity increases
Solution Approach 1:
The graft is divided into pie-shaped sections that can be harvested separately and arranged within the circular defect. This segmentation allows precise fitting of multiple smaller graft segments to match the defect dimensions exactly, improving fit precision while using a relatively simple circular cutting approach
Solution Approach 2:
The invention transitions from attempting to fit a single circular graft to using multiple pie-shaped segments arranged radially within the circular defect. This dimensional reorganization allows precise matching of graft total area to defect area while simplifying the harvesting process to standard circular cuts followed by radial segmentation
2Ease of manufacture
If circular grafts are placed in defect, then harvesting simplicity is improved, but voids between grafts are created
Solution Approach 1:
The circular graft material is segmented into pie-shaped sections that are arranged radially within the circular defect. This segmentation eliminates voids between grafts by allowing the segments to pack tightly together like slices of pie, achieving complete defect filling while maintaining the simplicity of circular harvesting
Solution Approach 2:
The invention maintains the circular/spheroidal shape of both the harvested graft and the defect, arranging pie-shaped segments radially within the circular defect. This curved geometry allows seamless packing of segments without linear edges or angular voids, ensuring complete defect filling while preserving harvesting simplicity
3Area of stationary object
If grafts are closely spaced, then defect coverage is improved, but spacing precision requirements increase
Solution Approach 1:
The defect is divided into multiple pie-shaped segments radiating from the center, allowing precise angular spacing of each graft segment. This radial segmentation naturally ensures uniform distribution and complete coverage of the circular defect area while simplifying spacing control through angular positioning
Solution Approach 2:
The invention addresses spacing precision by transitioning from linear side-by-side graft placement to radial arrangement of pie-shaped segments. This dimensional change from linear to radial spacing allows natural uniform distribution with consistent angular intervals, achieving maximum defect coverage with simplified spacing control
Data Source
AI summary
A surgical procedure according to which a cutting device is connected in a spaced relationship to an anchor, and the anchor is located over a first area of the bone. The distance between the cutting device and the anchor is adjusted so that the cutting device extends over a second area of the bone, and the anchor is driven into the first area of the bone so that the cutting device cuts into the second area.