Construct validity of center of rotation in differentiating of lumbar segmental instability patients.

Purpose: Lumbar Segmental Instability (LSI) is a subgroup of nonspecific Low Back Pain (NSLBP) without any accepted diagnostic tool as a gold standard. Some authors emphasize on quality measure such as centre of rotation (COR) but construct validity of this measure had not been approved. Therefore the purpose of the present study was to evaluate Concurrent and Convergent validity of COR in differentiating LSI.

The validity of vertebral translation and rotation in differentiating patients with lumbar segmental instability.

Background And Purpose: Lumbar segmental instability (LSI) is a sub-group of non-specific low back pain (NSLBP), without any accepted diagnostic tool as a golden standard. Some authors emphasize on clinical findings, and others focus on vertebral translation and rotation, but construct validity of these measures had not been approved. Therefore, the purpose of the study was to evaluate convergent and known group validity of vertebral translation and rotation in differentiating LSI from NSLBP and control subjects.

Reliability of quality measures of movement in lumbar spine flexion-extension radiography.

Background Data: For center of rotation (COR) and centroid length variables in lumbar flexion-extension radiography, enough reliability information is not available.

Objective: The objective of this study was to determine the intra-rater reliability of COR and centroid length of lumbar intervertebral movement.

Methods: A methodological research for reliability was designed.