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The clinical concept of spinal stiffness provides one basis for applying spinal manipulation. Because the terms used to describe the perceptual results of manual spinal stiffness testing are poorly defined, the nature and number of attributes contained in the concept remain unclear. This study attempted to clarify the concept of spinal stiffness by examining the relationships among 31 published spinal stiffness descriptors using cluster analysis.

Therapists' Conceptualization and Characterization of the Clinical Concept of Spinal Stiffness