Abstract Objective: Comparison of global and local abdominal muscles thickness in chronic non-‎specific low back pain patients with healthy controls in position of hook-lying over variant ‎stability surface utilizing diagnostic ultrasonography Methods and Materials: ‎ ‎20 chronic non-specific low back pain male patients compared with a convenient sample of ‎age and gender matched healthy controls in a semi-experimental study.‎ Thickness of abdominal muscles was measured in end of inspiration and expiration phases ‎by B-mode linear ultrasound transducer in three different hook-lying positions over: 1- ‎stable surface, 2- foam roller under spine and finally 3- foam roller under spine and one ‎foot. Data were analyzed utilizing SPSS.‎ Results: ‎ In healthy controls internal oblique and transverse abdomens muscles in expiration phase ‎revealed significant differences between three positions. P< 0.001 ‎ In patients internal oblique and transverse abdomens muscles only revealed significant ‎differences between position one and two. P< 0.005‎ Conclusion: ‎ In low back pain subjects internal oblique and transverse abdomens muscles were unable to ‎activate in more difficult position over unstable surface due to chronic pain process such as ‎functional deficiency and decrease number of muscle spindle and muscle fiber atrophy. ‎

Keywords: Abdominal muscles/ Non-specific chronic low back pain/ foam roller/ Diagnostic ‎ultrasonography.‎

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