Patient-Specific Femoral Stem Geometry for Hip Implant Insertability
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Solution Overview
Problem
Current hip implant designs are based on population statistics, leading to subjective fit and stability issues, with insertability determined post-operatively, and require extensive manual adjustments, increasing time and resource consumption.
Innovation Solution
A computer-implemented method generates patient-specific femoral stems or sleeves using 3D data to optimize cortical bone contact and insertion paths, ensuring stability and insertability through automated geometric shaping and analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If population-based statistical analysis is used to design generic hip implants, then design time is reduced through standardized approaches, but implant fit and stability become subjective and may not optimize individual patient outcomes
Solution Approach 1:
The system performs preliminary 3D modeling and virtual insertion simulations before actual surgery to determine the optimal implant geometry for each patient's unique anatomy. This pre-operative planning includes creating patient-specific femoral models from CT scans and simulating implant insertion paths to identify potential collisions with cortical bone, thereby resolving the contradiction by preparing customized solutions in advance rather than relying on generic post-operative adjustments
Solution Approach 2:
The invention generates patient-specific implant designs that locally adapt to individual anatomical variations in the femur, including customized stem geometry, diameter, length, and insertion angle based on each patient's unique bone structure. This local customization ensures optimal fit and stability for each patient while maintaining efficient design processes through automated 3D modeling algorithms
2Ease of manufacture
If generic tapered femoral stems are used to compensate for low bone contact, then manufacturing is simplified, but insertability cannot be pre-determined and surgical adjustments are required
Solution Approach 1:
The system performs virtual insertion simulations during the design phase to pre-determine insertability for each patient-specific implant before manufacturing and surgery. The software simulates the insertion path through the femoral canal and identifies potential collisions with cortical bone, allowing surgeons to plan appropriate rasping strategies in advance. This eliminates the need for intraoperative trial-and-error adjustments while maintaining standardized manufacturing processes
Solution Approach 2:
The invention creates accurate 3D digital copies of each patient's femur from CT scan data, including the cortical bone geometry and internal canal structure. These virtual models serve as test beds for simulating implant insertion and optimizing design parameters before actual manufacturing, thereby separating the complexity of customization from the manufacturing process itself
3Adaptability or versatility
If extensive manual rasping is performed to shape the femur for standardized implant fit, then implant standardization is maintained, but surgical time and resource consumption increase
Solution Approach 1:
The system determines the optimal rasping path and extent of bone removal during pre-operative planning by simulating implant insertion on patient-specific 3D models. The software identifies exactly where and how much cortical bone needs to be removed to achieve proper implant fit, allowing surgeons to perform targeted rather than extensive rasping. This reduces surgical time while maintaining the ability to use standardized implant geometries
Solution Approach 2:
The virtual insertion simulation provides feedback on whether the planned implant will collide with cortical bone or achieve proper fit. If collisions are predicted, the system adjusts the rasping plan or implant selection before surgery, ensuring that the standardized implant will fit correctly without requiring excessive bone removal or intraoperative adjustments
Data Source
AI summary
Computer implemented methods, systems, and computer products employing program code or algorithms for use in customized patient specific hip implants or femoral stems or sleeves having an outer surface that corresponds more closely to the inner surface of the cortical bone of a patient's femur compared to conventional hip implant or femoral stems or sleeves based on population-based design.