Dual-Mobility THA Stability via Dynamic Anteversion
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Solution Overview
Problem
Current total hip arthroplasty (THA) systems face a stability gap between dual-mobility and constrained systems, with constrained systems being less desirable due to reduced range of motion, increased precision requirements, and higher wear rates, while dual-mobility systems lack stability comparable to constrained systems.
Innovation Solution
A computer-implemented method for positioning stability components in THA systems, including determining spine mobility and adjusting inclination and anteversion angles of stability components to optimize the placement and orientation of femoral and acetabular components, enhancing the stability of dual-mobility systems to bridge the stability gap with constrained systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If constrained THA systems are used to maximize stability, then stability is improved, but range of motion is reduced and manufacturing precision requirements increase
Solution Approach 1:
The patent employs a nested dual-mobility structure where an inner mobile component is contained within an outer mobile component, both articulating relative to a fixed cup. This nested configuration allows multiple degrees of freedom while maintaining stability, effectively resolving the contradiction between stability and range of motion by providing constrained mobility at multiple levels simultaneously
2Reliability
If constrained THA systems are used to maximize stability, then stability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent transitions from a static constrained system to a dynamic dual-mobility system where components can adapt their orientation during movement. The mobile components allow the system to dynamically adjust to varying loads and positions, reducing the need for extremely precise static manufacturing while maintaining stability throughout the range of motion
3Reliability
If constrained THA systems are used to maximize stability, then stability is improved, but component wear increases
Solution Approach 1:
The mobile components enable dynamic load distribution and movement that prevents concentrated stress on single contact points. By allowing the femoral head to move independently within the mobile component, the system reduces impingement forces and distributes wear more evenly across the articulating surfaces, extending component lifespan while maintaining stability
4Ease of operation
If dual-mobility THA systems are used to maintain range of motion, then range of motion is preserved, but stability is reduced compared to constrained systems
Solution Approach 1:
The nested configuration with inner and outer mobile components creates multiple articulation interfaces that work together to provide stability. The inner component articulates with the femoral head while the outer component articulates with the cup, creating a cascading stability mechanism that maintains overall system stability while preserving range of motion
Data Source
AI summary
Described herein are systems and methods for the placement and design of the stability components of implant systems. Further, stability component assemblies, such as dual-mobility assemblies, for implant systems are also described herein. The systems and methods include using a standing sacral slope and a sitting sacral slope associated with a spine of a patient, determining a spine mobility based on the standing sacral slope and the sitting sacral slope, receiving poses of the implant system components, determining contact points between the components and locations of at least one of the components through a range of motion, receiving updated inclination and anteversion angles for the stability components of the implant system, and outputting an updated configuration for the stability component.