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Related Concept Videos

Knee Joint01:23

Knee Joint

3.7K
The knee joint is the most complicated joint in the body. It consists of three articulations– two tibiofemoral and one patellofemoral. As is characteristic of synovial joints, the knee joint has a thin articular capsule that partially surrounds this joint cavity. Additionally, several ligaments, muscles, and cartilaginous structures support the movement of the knee.
A total of seven ligaments support the knee joint. The patellar ligament, which is also attached to the quadriceps femoris...
3.7K

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Detecting Condylar Lift-Off with a Piezoelectric Smart Knee Replacement.

Brandon D Hines1, Ryan Willing2, Steven R Anton1

  • 1Department of Mechanical & Nuclear Engineering, Tennessee Technological University, Cookeville, TN 38505, USA.

Bioengineering (Basel, Switzerland)
|March 28, 2026
PubMed
Summary
This summary is machine-generated.

This study shows smart knee replacement can detect condylar lift-off, a key issue causing dissatisfaction after surgery. This technology offers real-time monitoring of joint loads to improve patient outcomes.

Keywords:
compartmental center of pressurecompartmental forcecondylar lift-offpiezoelectricsmart knee replacementtotal knee replacement

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Area of Science:

  • Biomedical Engineering
  • Orthopedic Technology
  • Sensing Technology

Background:

  • Postoperative dissatisfaction after total knee replacement is often linked to specific joint load phenomena.
  • Current methods lack real-time in vivo tracking of these phenomena.
  • Condylar lift-off is a clinically relevant issue contributing to patient dissatisfaction.

Purpose of the Study:

  • To evaluate a piezoelectric smart total knee replacement's ability to detect condylar lift-off.
  • To assess the real-time sensing of joint loads and center of pressure in a modified total knee replacement.

Main Methods:

  • A commercially available total knee replacement was modified with piezoelectric transducers.
  • The modified implant was tested using a six-degree-of-freedom joint motion simulator.
  • A varus lift-off profile was applied to simulate clinical conditions.

Main Results:

  • The piezoelectric sensing system successfully detected condylar lift-off.
  • Lift-off was evident in both sensed joint loads and tibiofemoral centers of pressure.
  • The system demonstrated sensitivity to localized changes in pressure distribution.

Conclusions:

  • The piezoelectric smart knee replacement is effective in detecting condylar lift-off.
  • This technology can identify a clinically significant mechanical issue in real time.
  • Smart knee implants show potential for improving postoperative monitoring and patient satisfaction.