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Quantifying Lumbar Mobilization With Inertial Measurement Unit.

Fahed Mehyar1, Sara E Wilson2, Vincent S Staggs3

  • 1Department of Physical Therapy, Eastern Washington University, Cheney, Washington.

Journal of Manipulative and Physiological Therapeutics
|June 3, 2020
PubMed
Summary

An inertial measurement unit (IMU) accurately measures clinician hand movement during lumbar mobilization. While valid, its moderate reliability may stem from inconsistent technique rather than the device itself.

Keywords:
BackHealthy VolunteersMovementReproducibility of Results

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Area of Science:

  • Biomechanics
  • Rehabilitation Technology
  • Physical Therapy

Background:

  • Lumbar mobilization is key for low back pain management.
  • Quantifying lumbar mobilization accurately remains a challenge.
  • Inertial measurement units (IMUs) offer a potential solution due to their small size and cost-effectiveness.

Purpose of the Study:

  • To assess the validity and reliability of an IMU for measuring hand movement amplitude during lumbar mobilization.
  • To compare IMU measurements against established laboratory measurement systems.

Main Methods:

  • An IMU was attached to a clinician's hand during L4 segment mobilization on 16 healthy participants.
  • Validity was assessed against force plate and motion capture systems.
  • Reliability was evaluated for inter-rater and intra-rater consistency using percent error and limits of agreement.

Main Results:

  • IMU measurements showed high correlation with force plate data (rs = 0.94).
  • IMU demonstrated high agreement with motion capture system data (%e = 4%, LOA = -11% to 20%).
  • Moderate inter-rater (%e = 6%, LOA = -25% to 37%) and intra-rater (%e = -1%, LOA = -29% to 27%) reliability was observed.

Conclusions:

  • The IMU is a valid tool for quantifying clinician hand movement amplitude in lumbar mobilization.
  • The moderate reliability may indicate variability in mobilization technique rather than device limitations.