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Is the clinical concept of spinal stiffness multidimensional?
1School of Physiotherapy, Faculty of Health Sciences, University of Sydney, Lidcombe, New South Wales, Australia.
Physical Therapy
|October 1, 1995
Summary
Physical therapists reliably judged spring stiffness but struggled with posteroanterior (PA) spinal stiffness. This suggests PA stiffness is complex and requires clearer definition for consistent clinical assessment.
Area of Science:
- Biomedical Engineering
- Clinical Biomechanics
- Physical Therapy
Background:
- Assessing spinal stiffness is crucial in physical therapy.
- Previous studies indicate poor reliability in judging posteroanterior (PA) spinal stiffness.
Purpose of the Study:
- To determine if poor reliability in PA spinal stiffness judgments stems from rater bias or differing individual concepts of stiffness.
- To compare physical therapists' ability to judge mechanical stiffness versus clinical PA spinal stiffness.
Main Methods:
- Three experienced physical therapist pairs rated the stiffness of metal springs and patients with low back pain.
- Reliability indices were calculated, and rater bias was assessed.
- The correlation between perceived and measured spring stiffness was evaluated using the Pearson Product-Moment Correlation Coefficient.
Main Results:
- Intraclass correlation for spring stiffness was .60, while for human spines it was .19.
- No evidence of rater bias was found for PA spinal stiffness judgments.
- Raters' estimates of stimulus magnitude strongly correlated with measured spring stiffness (r=.80).
Conclusions:
- Physical therapists are more adept at judging mechanical spring stiffness than clinical PA spinal stiffness.
- The discrepancy suggests PA stiffness is a multidimensional clinical construct, not solely mechanical.
- Clarifying the dimensions of PA stiffness is necessary to improve inter-rater reliability in clinical practice.