Bone Model Updating for Prosthesis Removal Bone Loss
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Solution Overview
Problem
The challenge in orthopedic revision surgeries is accurately predicting and adapting to bone loss caused by the removal of an existing orthopedic prosthesis, which complicates the surgical planning and registration of 3D models with real-world bones due to mismatched landmark locations.
Innovation Solution
A surgical assistance system generates a pre-revision model of the bone, obtains intra-revision imaging data to identify damaged and intact parts, and modifies the model to exclude damaged areas, enabling a revised surgical plan and improved registration with the actual bone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a pre-revision 3D model of the bone is used for surgical planning, then the surgical plan can be prepared in advance, but the model becomes inaccurate due to bone loss during prosthesis removal
Solution Approach 1:
The system transitions from a static pre-revision bone model to a dynamic intra-revision bone model that is updated during surgery. The intra-revision model is generated from real-time imaging data captured after prosthesis removal, allowing the model to adapt to actual bone conditions and maintain accuracy throughout the surgical procedure.
Solution Approach 2:
The system implements feedback by comparing the pre-revision model with actual intra-revision imaging data. This feedback loop identifies discrepancies caused by bone loss and enables generation of corrected intra-revision models that reflect the true bone geometry, improving subsequent surgical guidance accuracy.
2Ease of repair
If the existing prosthesis is removed during revision surgery, then the damaged prosthesis can be replaced, but bone loss occurs that complicates surgical planning
Solution Approach 1:
The system performs preliminary actions by generating the pre-revision bone model and surgical plan before prosthesis removal. This allows surgeons to prepare implant selection and surgical approach in advance, even though the final plan may be adjusted based on intra-revision findings.
Solution Approach 2:
The system changes parameters by transitioning from pre-revision to intra-revision modeling. This parameter change captures the actual bone geometry after prosthesis removal, including any bone loss or damage, enabling accurate measurement and planning for the replacement prosthesis.
3Measurement precision
If intra-revision imaging data is obtained during surgery, then accurate bone geometry can be captured, but the surgical process is extended
Solution Approach 1:
The system maintains continuity by integrating intra-revision imaging and model generation into the existing surgical workflow. The imaging and model updating occur during normal surgical steps without requiring separate dedicated time for model creation, keeping the surgical process flowing continuously.
Data Source
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AI summary
A surgical assistance system may obtain a pre-revision model of a bone of a patient. The pre-revision model of the bone represents a pre-revision state of the bone after a prior orthopedic surgery on the bone. In this example, an orthopedic prosthesis was attached to the bone during the prior orthopedic surgery. Additionally, the surgical assistance system may obtain intra-revision imaging data of the bone. The intra-revision imaging data represents an intra-revision state of the bone during the orthopedic revision surgery after removal of the orthopedic prosthesis from the bone. The surgical assistance system may determine, based on the intra revision imaging data, damaged and intact parts of the bone. The surgical assistance system may then generate a second intra-revision model of the bone by modifying the pre-revision model of the bone to exclude damaged parts of the bone.