Bone Resection Guide System for Void Filler Alignment
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Solution Overview
Problem
During joint revision surgery, surgeons face challenges in accurately resecting bone to accommodate void fillers due to unpredictable bone void shapes and the need for precise alignment, often relying on guesswork without effective tools for ensuring proper fit and structural integrity.
Innovation Solution
A resection guide system comprising a guide body and shim, used with an inserter/extractor tool, allows for accurate resection of bone to match the void filler's placement, ensuring a precise fit and maintaining structural integrity by guiding cutting instruments within the bone void.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If bone resection is performed without a guide system, then the surgical procedure is simpler, but the alignment and fit of void fillers become inaccurate
Solution Approach 1:
The resection guide body is shaped and sized to correspond to the void filler prosthesis, creating a physical copy or replica of the final implant. This allows the surgeon to use the guide body as a template to achieve accurate alignment and fit during bone resection, eliminating the need for complex measurement and calculation procedures while maintaining high precision.
Solution Approach 2:
The resection guide body serves as an intermediary tool between the surgeon's planning and the actual bone resection. It translates the desired final position and orientation of the void filler into a physical guide structure that directly guides the cutting instrument, simplifying the surgical process while ensuring accuracy.
2Manufacturing precision
If guesswork is used for resection depth and angle, then the surgical procedure is faster, but the fit between bone and void filler deteriorates
Solution Approach 1:
The resection guide body is prepared in advance with the exact shape and size corresponding to the void filler prosthesis. This preliminary preparation of the guide system allows the surgeon to simply insert and use it during surgery, eliminating time-consuming measurements and calculations while ensuring precise resection depth and angle.
Solution Approach 2:
By creating a physical copy of the void filler as the resection guide body, the system provides built-in guidance for accurate resection without requiring additional time for complex planning or measurement procedures during surgery.
3Reliability
If native bone is resected to accommodate prosthetics, then the prosthesis can be implanted, but the structural integrity of the joint is compromised
Solution Approach 1:
The resection guide enables precise localized bone resection only where needed to accommodate the void filler, rather than requiring extensive bone removal. This maintains the structural integrity of surrounding native bone while creating the necessary space for the prosthesis in the specific area of bone loss.
Solution Approach 2:
The guide body is prepared in advance to match the void filler dimensions, allowing for precise bone resection planning and execution. This preliminary preparation ensures that only the minimum necessary bone is removed, preserving overall joint structural integrity while facilitating prosthesis implantation.
Data Source
AI summary
A method of resecting an end of bone comprising inserting a cutting guide having a guide surface into a void in an end of bone such that the guide surface is beneath an end surface of the bone, and resecting the bone along the guide surface while the cutting guide remains disposed within the void in the end of the bone.