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Quantitative pivot shift assessment using combined inertial and magnetic sensing.

David R Labbé1,2, Di Li3,4, Guy Grimard5

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Summary

This study shows that micro-electromechanical systems (MEMS) sensors can accurately measure the pivot shift phenomenon in anterior cruciate ligament injuries. This new system improves correlation with clinical grading for better assessment.

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Area of Science:

  • Orthopedic biomechanics
  • Biomedical engineering
  • Sports medicine

Background:

  • The pivot shift test is a clinical examination for anterior cruciate ligament (ACL) instability.
  • Quantifying the pivot shift phenomenon objectively remains a challenge in clinical practice.

Purpose of the Study:

  • To demonstrate the feasibility of a novel measurement system for quantifying the pivot shift phenomenon.
  • To utilize micro-electromechanical systems (MEMS)-based sensors for objective kinematic assessment.
  • To improve the correlation between objective measurements and clinical grading of the pivot shift.

Main Methods:

  • Performed the pivot shift test on 13 ACL-deficient subjects.
  • Recorded femur and tibia kinematics using inertial sensors (accelerometer, gyroscope, magnetometer).
  • Removed gravitational component from sensor data using a novel orientation estimation method.
  • Correlated kinematic parameters with clinical pivot shift grade using Spearman's rank correlation.

Main Results:

  • The pivot shift phenomenon was characterized by a distinct drop in femoral acceleration at reduction.
  • A very strong correlation (r=0.84, p<0.0001) was found between femoral acceleration drop and clinical grade.
  • The MEMS-based system successfully quantified key aspects of the pivot shift.

Conclusions:

  • The study validates the feasibility of using MEMS-based sensors to quantify the pivot shift.
  • A novel method for removing gravitational effects enhanced the correlation with clinical assessment.
  • This technology offers a promising tool for objective evaluation of ACL injuries.