Bone Surface Registration Using Opposing Joint Geometry
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Solution Overview
Problem
Existing orthopaedic surgical procedures face challenges in accurately registering and generating bone surface geometry, particularly for inaccessible or unexposed bone surfaces, often requiring lengthy physical registration and relying on medical imaging, which may be inaccurate.
Innovation Solution
A method and system that projects and maps geometry data from a bone-contacting surface to a coordinate space of an opposing bone, using a computing device to generate accurate geometry data for inaccessible bone surfaces by capturing and filtering coordinate data from registration tools and sensors, without the need for direct registration or X-rays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If physical registration methods are used to capture bone surface geometry, then direct contact with bone surfaces is required, but this becomes impractical or impossible for inaccessible or unexposed bone surfaces
Solution Approach 1:
The patent uses an opposing bone surface as an intermediary to indirectly capture geometry data of the target bone surface. By capturing data from the opposing surface that is in contact with the target surface, the system obtains geometry information without requiring direct access to the target surface, thus resolving the accessibility problem while maintaining measurement accuracy
Solution Approach 2:
The system creates a geometric copy or representation of the inaccessible bone surface by capturing and processing data from the opposing bone surface. This copying approach allows the geometry of the target surface to be reconstructed indirectly, enabling accurate representation without physical access to the original surface
2Measurement precision
If traditional registration methods are used for bone surfaces, then lengthy physical registration processes are required, but this reduces surgical efficiency
Solution Approach 1:
The system performs preliminary action by capturing geometry data from the opposing bone surface before the actual surgical procedure on the target bone. This advance data collection eliminates the need for lengthy registration processes during surgery, thereby improving surgical efficiency while maintaining registration accuracy through pre-acquired geometric information
Solution Approach 2:
The patent extracts the geometry data capture process from the main surgical workflow by using the opposing bone surface as a separate data source. This extraction allows registration data to be obtained independently and efficiently without interfering with or extending the primary surgical procedure, thus improving productivity while preserving accuracy
3Measurement precision
If medical imaging is used to obtain bone surface geometry, then imaging equipment and radiation exposure are required, but this reduces patient safety and increases complexity
Solution Approach 1:
The system uses the patient's own opposing bone surface as the data source, eliminating the need for external imaging equipment and radiation. The bone surface itself provides the geometric information needed, making the process self-sufficient and avoiding harmful factors while maintaining measurement precision through direct physical measurement of the opposing surface
4Measurement precision
If direct physical registration of bone surfaces is performed, then contact with the bone surface is required, but this is impossible for inaccessible surfaces
Solution Approach 1:
The patent creates a universal method that can be applied to any inaccessible bone surface by using the opposing bone surface as the data source. This approach makes the registration system versatile and adaptable to various anatomical locations and surgical scenarios, eliminating the limitation of direct access requirements while maintaining measurement accuracy across different applications
Data Source
AI summary
Systems and methods for bone surface geometry generation include a computing device. The computing device projects first geometry data indicative of a first bone-contacting surface of a first bone of a patient to a coordinate space of a second bone of the patient to generate projected geometry. The second bone includes a second bone-contacting surface that interfaces with the first bone-contacting surface. The computing device also maps the projected geometry to a plurality of poses in a range of motion of the first bone relative to the second bone using position data indicative of relative positions of the first bone and the second bone at the plurality of poses in the range of motion. The computing device further selects intersecting geometry from the mapped, projected geometry to generate second geometry data indicative of the second bone-contacting surface.