Bone Graft Sizing Instrumentation for Glenoid Reconstruction
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Solution Overview
Problem
Current techniques for bone reconstruction, such as the Latarjet procedure, face challenges in effectively reconstructing the glenoid to treat glenohumeral instability caused by repetitive trauma and bone loss, particularly in accurately sizing and shaping grafts for optimal stability.
Innovation Solution
A surgical instrumentation set comprising a graft workstation with interchangeable cutting blocks and guides allows for precise sizing and shaping of bone grafts, including a distal tibia allograft, to match the specific bone loss, enabling accurate reconstruction of damaged bone by making various cuts and preparing the graft for secure attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If current techniques such as the Latarjet procedure are used for bone reconstruction, then the procedure can be performed with existing methods, but the reconstruction of the glenoid to treat glenohumeral instability remains challenging due to difficulty in accurately sizing and shaping grafts
Solution Approach 1:
The cutting jig is divided into multiple interchangeable cutting blocks, each designed for specific cutting orientations (vertical, horizontal, angled) and positions. This segmentation allows precise control over graft geometry while maintaining a manageable system architecture where each component has a dedicated function.
Solution Approach 2:
The cutting jig serves multiple functions by accepting various interchangeable cutting blocks that can perform different cutting operations. This multi-functionality enables a single device to handle complex graft preparation requirements including multiple cut types and orientations, reducing the need for multiple separate tools while improving precision.
2Manufacturing precision
If standardized graft sizes are used, then the procedure is simpler, but the graft may not accurately match the specific bone loss geometry
Solution Approach 1:
The cutting jig system allows dynamic adjustment of cutting parameters through interchangeable blocks, enabling the surgeon to adapt the graft dimensions and geometry in real-time based on the specific bone loss characteristics. This dynamic capability ensures precise matching while maintaining operational flexibility.
Solution Approach 2:
By changing the cutting block configuration and orientation, the system enables precise modification of graft parameters (length, width, angle, shape) to match the specific bone defect geometry. This parameter adjustment capability allows customization without requiring completely different tools for each scenario.
3Measurement precision
If manual sizing techniques are used, then the process is simpler, but the estimation of bone loss and graft sizing is less accurate
Solution Approach 1:
The sizing blocks are designed to physically replicate or model the desired graft dimensions and geometry. By using these standardized sizing templates, surgeons can accurately estimate bone loss and determine appropriate graft size through direct comparison, improving measurement precision while keeping the sizing process relatively simple.
Data Source
AI summary
This disclosure details surgical instrumentation and related techniques for performing bone reconstruction surgeries. The surgical instrumentation may be used to size and shape a graft, such as an allograft. The appropriately sized and shaped graft is subsequently used to reconstruct damaged bone. A surgical instrumentation set is used to prepare the graft. The surgical instrumentation set includes a graft workstation, a plurality of sizing blocks and a plurality of cutting blocks.