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Clinicians' Ability to Detect a Palpable Difference in Spinal Stiffness Compared With a Mechanical Device.
Gregory N Kawchuk1, Stephen Miazga2, Isabelle Pagé1
1Department of Physical Therapy, University of Alberta, Edmonton, Alberta, Canada.
Journal of Manipulative and Physiological Therapeutics
|April 20, 2019
Summary
Clinicians can detect an 8% difference in spinal stiffness by palpation. However, this threshold limits their ability to identify smaller spinal stiffness changes, impacting clinical assessment accuracy.
Area of Science:
- Biomechanical analysis of spinal structures.
- Human sensory perception and motor control.
Background:
- Spinal stiffness assessment is crucial for diagnosing and managing various musculoskeletal conditions.
- Palpation is a primary clinical tool for evaluating spinal stiffness, but its accuracy is not well-defined.
Purpose of the Study:
- To quantify the threshold of spinal stiffness detection via palpation in clinicians.
- To determine if this palpation threshold affects the ability to identify objective changes in spinal stiffness.
Main Methods:
- Experienced clinicians (physical therapists, doctors of chiropractic) identified the stiffer of two inflatable targets with varying stiffness.
- Clinicians palpated vertebral pairs (T7-L3, T7-L4, L3-L4) in an asymptomatic volunteer to identify the stiffer segment.
- Objective biomechanical instruments quantified the actual stiffness differentials.
Main Results:
- The mean palpation threshold for detecting stiffness differences was 8%.
- Objective stiffness differentials ranged from 10% to 30%.
- Clinicians accurately identified stiffer vertebrae when differences exceeded ~20%, but struggled when differentials approached the 8% palpation threshold.
Conclusions:
- The physiological limits of human palpation may restrict clinicians' ability to detect subtle alterations in spinal stiffness.
- Objective measurement tools reveal stiffness differences beyond the typical palpation detection threshold.