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Related Concept Videos

Relative Motion Analysis using Rotating Axes-Problem Solving01:29

Relative Motion Analysis using Rotating Axes-Problem Solving

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Consider a crane whose telescopic boom rotates with an angular velocity of 0.04 rad/s and angular acceleration of 0.02 rad/s2. Along with the rotation, the boom also extends linearly with a uniform speed of 5 m/s. The extension of the boom is measured at point D, which is measured with respect to the fixed point C on the other end of the boom. For the given instant, the distance between points C and D is 60 meters.
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Related Experiment Video

Updated: May 2, 2026

Sit-to-stand-and-walk from 120% Knee Height: A Novel Approach to Assess Dynamic Postural Control Independent of Lead-limb
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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
PubMed
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.

Keywords:
instrumented orthopaedic prosthesisjoint impingementmagnetic position and orientation sensing systemsubluxationtotal hip replacement

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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.