Research Article

Pain Catastrophizing Is Related to Static Postural Control Impairment in Patients with Nonspecific Chronic Low Back Pain: A Cross-Sectional Study

Figure 1

Ultrasound images and measures of transversus abdominis muscles. (a) Relaxed state. (b) Contracted state. EO: external oblique; IO: internal oblique; TrA: transversus abdominis; ST: subcutaneous tissue; and ADIM: abdominal drawing-in manoeuvre.
(a)
(b)