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Measuring Relative Component Motion and Stability in Total Hip Replacements Using a Magnetic Position and Orientation
Oliver G Vickers1, Peter R Culmer1, Graham H Isaac1
1The Faculty of Engineering and Physical Sciences, University of Leeds, Leeds LS2 9JT, UK.
Sensors (Basel, Switzerland)
|December 11, 2025
Summary
This study developed a magnetic sensing system for instrumented total hip replacement (THR) implants. The system accurately tracks component motion, aiding in patient recovery monitoring and early detection of adverse events.
Area of Science:
- Biomedical Engineering
- Orthopedic Surgery
- Medical Device Technology
Background:
- Continuous monitoring of total hip replacement (THR) implants is desirable for tracking patient recovery and detecting adverse events.
- Measuring relative motion of THR components offers insights into joint kinematics, impingement, and subluxation.
Purpose of the Study:
- To develop a sensing system for measuring the relative orientation and translation of THR prosthesis components.
- To integrate magnetic sensing technology into clinically available THR components for remote monitoring.
Main Methods:
- A tri-axis magnetometer and a permanent magnet were incorporated into THR components to create a magnetic position and orientation sensing system.
- A robotic arm simulated component articulation, with data validated against a camera tracking system.
Main Results:
- The magnetic sensing system accurately measured relative component orientation (RMSE <4.0° in two degrees of freedom).
- Femoral head displacement during impingement-driven subluxation was measured with high accuracy (RMSE of 0.2 mm).
Conclusions:
- Magnetic sensing technology is a viable method for tracking the position and orientation of THR components.
- This proof-of-concept demonstrates potential for future instrumented THR implants with integrated sensing capabilities.
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