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Related Experiment Video

Updated: Apr 24, 2026

In Vitro Application of a Wireless Sensor in Flexion-Extension Gap Balance of Unicompartmental Knee Arthroplasty
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Enclosed electronic system for force measurements in knee implants.

David Forchelet1, Matteo Simoncini2, Arash Arami3

  • 1Microsystems Laboratory (LMIS4), École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland. david.forchelet@epfl.ch.

Sensors (Basel, Switzerland)
|September 9, 2014
PubMed
Summary

This study introduces an instrumented knee prosthesis insert with embedded sensors to measure forces during total knee arthroplasty. The novel device accurately quantifies forces, aiding surgeons in optimizing soft tissue balance and improving patient outcomes.

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Area of Science:

  • Biomedical Engineering
  • Orthopedic Surgery
  • Materials Science

Background:

  • Total knee arthroplasty (TKA) relies on surgeon experience for soft tissue balancing.
  • Limited intraoperative and postoperative data exists on forces within knee prostheses.

Purpose of the Study:

  • To design, fabricate, and test an instrumented insert for measuring forces in knee prostheses.
  • To provide objective data for improving TKA surgical techniques.

Main Methods:

  • Developed an insert with printed circuit boards and microfabricated polyimide thin-film piezoresistive strain sensors.
  • Tested the insert using a mechanical knee simulator under static and dynamic loading conditions.

Main Results:

  • Sensors accurately measured forces up to 1.5 times body weight.
  • The system demonstrated sensitivity suitable for TKA applications.
  • Dynamic testing confirmed the sensors' ability to track varying forces.

Conclusions:

  • The instrumented insert is a viable tool for measuring forces in knee prostheses.
  • This technology can enhance surgical precision and potentially improve TKA outcomes.