en Physical Medecine& Rehabilitaion Physical Medecine& Rehabilitaion Original Research Original Research <p> <strong> Abstract </strong></p><p> <strong> Background: </strong>Sacroiliac joint (SIJ) dysfunction is a widely known but poorly defined </p><p>  cause of low back pain. To our knowledge, few published studies have been </p><p>  conducted to evaluate systematically the prevalence and significance of concomitant </p><p>  sacroiliac joint dysfunction in patients with herniated lumbar discs. As concomitant </p><p>  SIJ dysfunction in low back pain patients is likely to respond to particular noninvasive </p><p>  interventions such as manipulation, improved understanding of the relationship </p><p>  between these two diagnoses would improve clinical decision making and research. </p><p> <strong> Methods: </strong>This study was designated to estimate the prevalence of concomitant </p><p>  sacroiliac joint dysfunction in sub acute low back pain patients with image proven </p><p>  discopathy and evaluate the theory that sacroiliac joint dysfunction can be a source of </p><p>  pain and functional disability in discopathy. A total of 202 patients with sub acute </p><p>  radicular back pain and MRI proven herniated lumbar discs underwent standardized </p><p>  physiatrist history and physical examination, specified for detection of concomitant </p><p>  sacroiliac joint dysfunction. </p><p> <strong> Results: </strong>Sacroiliac joint dysfunction is a concomitant finding in 72.3% of evaluated </p><p>  patients. There was significantly higher SIJ dysfunction prevalence in female </p><p>  patients (p <0.001), patients with recurrent pain (p <0.005) and in patients with positive </p><p>  straight leg raising provocative test (p <0.0001). </p><p> <strong> Conclusion: </strong>SIJ dysfunction is a significant pathogenic factor with high </p><p>  possibility of occurrence in low back pain. Thus, in the presence of </p><p>  radicular and sacroiliac joint symptoms, SIJ dysfunction, regardless of </p><p>  intervertebral disc pathology, must be considered in clinical decision </p><p>  making. </p> sacroiliac joint, sacroiliac joint dysfunction, radiculopathy, low back pain 23 30 http://mjiri.iums.ac.ir/browse.php?a_code=A-10-1-36&slc_lang=en&sid=1 Seyed Pezhman Madani pejman599@yahoo.com 20031947532846001754 20031947532846001754 Yes Department of Physical Medicine and Rehabilitation, Mohammad Dadian 20031947532846001755 20031947532846001755 No Department of Physical Therapy, Welfare and Rehabilitation University,Tehran, Iran. Keykavous Firouznia 20031947532846001756 20031947532846001756 No Department of RadiologyTehran University of Medical Science, Tehran, Iran. Salah Alalawi 20031947532846001757 20031947532846001757 No Royal National Hospital for Rheumatic diseases-Bath, UK. Ali akbar Jafarian 20031947532846001758 20031947532846001758 No Department of Anesthesia and critical care, Iran University of Medical Sciences,Tehran, Iran.