Cutting Jig for Glenoid Bone Graft Curvature Matching
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Solution Overview
Problem
Current methods for glenoid augmentation in shoulder repair, such as the Latarjet procedure using a coracoid autograft, face challenges with imperfect fit and stability due to the mismatch in curvature and lack of accompanying soft tissue, leading to recurring instability and osteoarthritis.
Innovation Solution
A cutting jig and clamp system designed to prepare a distal radius bone graft with a graft-engaging surface that matches the curvature of the glenoid, along with modular inserts to ensure precise fitting and stability, and a method for preparing the graft using adjustable components to minimize cuts and ensure accurate alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a distal tibial allograft is used for glenoid augmentation, then articular cartilage and good radius of curvature matching in the superior/inferior direction are provided, but the graft is relatively large requiring many cuts and offers little radius of curvature in the medial/lateral direction
Solution Approach 1:
The patent extracts only the necessary portion of the distal tibial allograft that matches the glenoid curvature requirements, removing excess bone material. The cutting jig enables selective removal of bone to achieve the precise shape needed for glenoid augmentation without requiring multiple complex cuts.
Solution Approach 2:
The cutting jig is designed with pre-configured guides and stops that establish the correct cutting angles and depths before the actual bone removal begins. This preliminary setup ensures that subsequent cuts automatically achieve the desired curvature match with the glenoid, reducing the skill and time required during surgery.
2Strength
If a coracoid autograft is used in the Latarjet procedure, then bone augmentation is provided, but imperfect fit and stability occur due to mismatch in curvature and lack of soft tissue
Solution Approach 1:
The patent applies local quality by preserving the specific curvature characteristics of the distal tibial allograft that match the glenoid's anatomical shape. The cutting jig enables selective shaping of specific regions of the graft to achieve precise local conformity with the glenoid surface, ensuring optimal fit and stability at the augmentation site.
Solution Approach 2:
The cutting jig acts as an intermediary tool that translates the anatomical requirements of the glenoid into precise cutting parameters for the allograft. It mediates between the donor site geometry and the recipient site requirements, ensuring the graft achieves the correct shape for stable fixation.
3Manufacturing precision
If multiple cuts are made to shape the allograft, then fit precision is improved, but surgical time and complexity increase
Solution Approach 1:
The cutting jig incorporates pre-established guides, stops, and angle references that are configured before surgery based on the patient's specific anatomy. This preliminary preparation allows the surgeon to make precise cuts with minimal adjustment during the procedure, achieving high fit precision while reducing surgical time.
Solution Approach 2:
The cutting jig is designed as a multi-functional device that can perform multiple cutting operations with a single setup. It integrates various guiding features that enable different types of cuts (transverse, oblique, angled) to be made systematically, reducing the need for multiple separate tools and setup procedures.
Data Source
AI summary
In an aspect, a clamp system is provided including a clamp and a base, the base including a graft-engaging block including a graft-engaging surface engaging a first surface of the graft, and the clamp contacts the graft while at least a portion of the graft opposite the first surface is removed. In another aspect, a method of preparing a distal radius bone graft is provided including positioning the distal radius bone graft into a clamp such that at least part of a proximal portion and at least another portion of the bone graft are accessible, performing a depth cut on the proximal portion of the graft to form a prepared proximal face, and performing a width cut on the another portion to form a prepared face.