Relationship between low back pain and lumbar multifidus size at different postures.

Study Design: A prospective study of multifidus images. OBJECTIVE.: To compare the change of the cross-sectional area (CSA) of multifidus in subjects with and without chronic low back pain (LBP) at different postures.

Development and validation of a new technique for assessing lumbar spine motion.

Study Design: Dynamic lumbar flexion-extension motions were assessed by an electrogoniometer and a videofluoroscopy unit simultaneously.

Objective: To develop and validate a new technique for the assessment of lumbar spine motion.

Summary Of Background Data: Spine instability, a clinical condition that is common but difficult to diagnose, has been suggested to involve a characteristic change in the relation between vertebrae during motion.