Patient-Specific Glenoid Jig for Non-Parallel Augment Positioning
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Challenges arise in restoring neutral glenoid alignment during shoulder arthroplasty with severe deformities, requiring bone grafts and augmented implants, while ensuring precise implant positioning and orientation to minimize bone removal and complications.
Innovation Solution
A computer-assisted surgery method and system that generates patient-specific jigs for guiding implant placement, utilizing virtual modeling and non-parallel reaming axes to preserve native bone and ensure stable implantation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If conventional implant positioning methods are used in severe glenoid deformity cases, then implant placement can be performed, but bone removal increases and native bone preservation decreases
Solution Approach 1:
The system performs preoperative planning and virtual implant positioning before surgery to determine the optimal implant position and orientation. Patient-specific instrumentation is fabricated in advance based on this planning, allowing the actual surgical procedure to simply replicate the pre-determined optimal positioning, thereby minimizing bone removal while ensuring precise implant placement.
Solution Approach 2:
Patient-specific instrumentation serves as an intermediary tool that transfers the preplanned implant position and orientation to the actual surgical procedure. The PSI includes guides and jigs that physically guide the implant placement, ensuring that the implant is positioned exactly as planned while minimizing the need for intraoperative bone removal and adjustment.
2Stability of the object's composition
If augmented implants are used to fill glenoid voids, then implant stability improves, but surgical complexity increases
Solution Approach 1:
The system determines the optimal positioning and orientation of augmented implants with complex geometries through preoperative planning. The patient-specific instrumentation is fabricated in advance to guide the placement of these complex implants, transforming a potentially complex intraoperative decision-making process into a straightforward replication of pre-determined positioning, thereby reducing surgical complexity while maintaining implant stability.
Solution Approach 2:
The patient-specific instrumentation includes physical replicas or guides based on the virtual implant model and planned positioning. These copies or guides directly transfer the complex geometric information of the augmented implant and its optimal position to the surgical field, eliminating the need for complex intraoperative measurements and adjustments, thus reducing surgical complexity while ensuring stable implantation.
3Loss of substance
If preoperative planning is performed to optimize augment location, then bone preservation improves, but time required for preparation increases
Solution Approach 1:
The system creates digital 3D copies of the patient's glenoid anatomy from imaging data and uses these virtual models for preoperative planning. Patient-specific physical instrumentation is also fabricated as physical copies or guides based on this virtual planning. This copying process allows comprehensive preoperative optimization of implant positioning to minimize bone removal, while the automated nature of digital modeling and modern fabrication techniques keeps the time investment manageable.
Data Source
AI summary
Patient-specific instrumentation for reverse shoulder surgery includes a jig having a contact surface including a patient-specific surface portion negatively shaped as a function of a glenoid surface and configured to be applied against the glenoid surface in unique complementary engagement. A first throughbore opens into the contact surface, the first throughbore having an axis corresponding to a first altered bone plane in the glenoid surface. A second throughbore opens into the contact surface, the second throughbore having an axis corresponding to a second altered bone plane in the glenoid surface. The axes of the first throughbore and of the second throughbore are not parallel to one another.