Hip Prosthesis Positioning Using ADL Contact Point Modeling
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Solution Overview
Problem
Existing pre-operative planning methods for hip arthroplasty fail to provide orthopaedic surgeons with an understanding of the patient's hip mechanics and potential performance of the hip prosthesis, leading to improper positioning and increased risk of dislocation.
Innovation Solution
A computer-assisted system that utilizes medical images and a generic activities-of-daily-living (ADL) mechanics model to determine pelvic tilt measurements and contact points between the femoral head and acetabular cup, generating contact plots to guide proper acetabular cup orientation and reduce edge loading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual pre-operative planning is performed based on examination and pre-operative medical images, then the surgical planning process is simple and quick, but the accuracy of prosthetic positioning and understanding of hip mechanics is insufficient
Solution Approach 1:
The patent creates a virtual copy of the patient's hip anatomy through 3D reconstruction from medical images, allowing precise measurement and planning without physical manipulation. The virtual model enables accurate determination of anatomical landmarks, acetabular orientation, and prosthesis positioning parameters while maintaining surgical simplicity through software-based analysis.
Solution Approach 2:
The patent replaces manual mechanical measurement methods with computer-based image analysis and 3D modeling. The system automatically calculates positioning parameters, acetabular cup orientation, and mechanical axis alignment through software algorithms, eliminating the need for complex physical measurement tools and manual calculations while improving precision.
2Reliability
If a generic ADL mechanics model is used to determine contact points, then the functional performance and hip mechanics understanding are improved, but the computational complexity and time required increase
Solution Approach 1:
The patent performs contact point determination and mechanical analysis during the pre-operative planning phase, before the actual surgery. By calculating the generic ADL mechanics model and contact points in advance using 3D models and virtual simulations, the system eliminates time-consuming computations during the surgical procedure, allowing surgeons to directly apply pre-determined optimal positioning parameters.
Solution Approach 2:
The patent uses virtual copies and simulations of hip mechanics through 3D modeling and computer-based ADL (activities of daily living) analysis. Instead of performing complex mechanical measurements on the actual patient during surgery, the system creates virtual models that simulate contact points, load distribution, and mechanical performance, providing reliable functional assessment without time loss during the surgical procedure.
3Adaptability or versatility
If multiple orientations of the acetabular cup are evaluated, then the optimal positioning for patient-specific anatomy is achieved, but the complexity of selection and analysis increases
Solution Approach 1:
The patent provides visual feedback through color-coded representations of contact points on the acetabular cup surface. Different colors indicate different contact point locations and their significance for various orientations. This visual feedback system guides surgeons in selecting optimal cup orientations by clearly showing which orientations provide the most favorable contact point distribution for the patient's specific anatomy, simplifying the decision-making process.
Solution Approach 2:
The patent uses color coding to represent different contact point locations and orientations on the acetabular cup. By mapping contact points to specific colors based on their position and significance, the system transforms complex multi-orientation data into an intuitive visual format that is easy to interpret, allowing surgeons to quickly identify optimal orientations without being overwhelmed by numerical data or complex geometric analysis.
Data Source
AI summary
An apparatus, system, and method for determining a position of a hip prosthesis in a bone of a patient includes determining a set of contact points between a femoral head of a femoral prosthesis and a cup liner of an acetabular cup to be implanted into a patient based on a mechanics model. The mechanics model is indicative of mechanical motion of a hip exhibited during performance of a set of ADL or at corresponding functional positions of the patient. In some embodiments, a mathematical model may be generated based on a plurality of sets of contact points determined using the mechanics model and subsequently used to determine a resultant set of contact points.