Hip Modeling Simulation for Acetabular Cup Placement

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Solution Overview

Problem

Current methods for planning hip arthroplasties do not adequately account for individual spinopelvic mobility limitations, leading to potential impingement and dislocation risks due to improper acetabular cup placement, which can result in additional surgeries and patient discomfort.

Innovation Solution

A processor-implemented method that uses a three-dimensional human anatomy model to simulate various activities based on patient-specific spinopelvic conditions, determining sacral slopes, and classifying spinopelvic mobility to optimize acetabular cup placement and display hip joint kinematic information, thereby reducing the risk of impingement.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If standard acetabular cup placement methods are used without considering spinopelvic mobility, then surgical procedure is simplified, but risk of impingement and dislocation increases

Engineering Contradiction:

Improverisk of impingement and dislocationVSAvoidcomplexity of surgical planning

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The system performs preliminary simulation of patient-specific activities (sitting, standing, walking) before surgery to determine optimal acetabular cup placement. By pre-calculating spinopelvic mobility ranges and simulating joint kinematics for each patient's specific condition, the system establishes safe placement parameters before the actual surgery, thereby reducing impingement and dislocation risks without adding complexity to the surgical procedure itself

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system creates a digital copy or virtual model of the patient's hip joint and spinopelvic system. This virtual model allows surgeons to test different acetabular cup placements and activity simulations without affecting the actual patient, enabling comprehensive pre-surgical planning while keeping the actual surgical procedure straightforward

Inventive Principle:

Principle #26Copying

2Manufacturing precision

If personalized simulation for each patient is performed, then acetabular cup placement accuracy is improved, but computational time and resources increase

Engineering Contradiction:

Improveacetabular cup placement precisionVSAvoidsimulation computation time

Core Design Contradiction:

Manufacturing precisionVSLoss of time

Solution Approach 1:

The system implements a tiered simulation approach where essential activity simulations (sitting, standing, walking) are performed to achieve sufficient precision for clinical decision-making. Rather than simulating every possible patient movement, the system focuses on the most clinically relevant activities that impact acetabular cup placement, thereby achieving adequate precision without excessive computation time

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The system utilizes patient-specific anatomical parameters (sacral slope, pelvic incidence, spinopelvic mobility ranges) to customize simulations efficiently. By leveraging these pre-measured parameters from imaging studies, the system can quickly configure personalized simulations without requiring extensive new data collection or computation, thus maintaining high placement precision while minimizing time loss

Inventive Principle:

Principle #35Parameter changes

3Reliability

If spinopelvic mobility limitations are accounted for in simulation, then surgical outcome is improved, but model complexity increases

Engineering Contradiction:

Improvesurgical outcome successVSAvoidsimulation model complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The simulation model is segmented into distinct functional components: spinopelvic mobility module, hip joint kinematics module, and acetabular cup placement module. Each module handles specific aspects of the simulation independently, allowing the system to account for spinopelvic mobility limitations without creating an intractably complex monolithic model. This modular approach improves surgical outcomes through comprehensive simulation while managing model complexity through structured organization

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS20230329794A1Systems and methods for hip modeling and simulation

Publication Date: 2023.10.19 SMITH & NEPHEW INC

AI summary

A method of assessing hip joint kinematics based on a spinopelvic condition of a patient is provided. The method comprises receiving a three-dimensional model of a human anatomy and receiving input related to a spinopelvic condition of a patient. The method further comprises determining a sitting sacral slope and a standing sacral slope of the patient based on the input and classifying the spinopelvic condition of the patient based on at least one of the sitting sacral slope and a standing sacral slope. The method further comprises modifying the three-dimensional model according to the spinopelvic condition and performing at least one simulation of one or more activities with the modified three-dimensional model. The method further comprises and displaying hip joint kinematic information from the simulations on a display device.