ObjectiveThe sacroiliac joint dysfunction is a known cause of low back pain. We think that a test score (SI5) may be performed to assess diagnostic utility of clinical signs of sacroiliac joint dysfunction. The primary aim of the present study was to conduct conducting the pilot study of our new test score SI5. MethodsAfter reviewing the literature about of clinical characteristic, diagnostic test and imaging of the sacroiliac joint; we evaluated diagnostic utility of these aspects and developed the SI5 test score. The SI5 test score was performed in 22 patients with low back pain including completion of a standard questionnaire, history, physical examination performed by a physician, and evaluation of the results. ResultsThe most sensitive clinical tests for diagnosing of sacroiliac joint dysfunction were Laguerre Test, sacroiliac rocking test and Yeomans test (Greater than 80% sensitivity). The tests with greater specificity ( > 80%) were Lewitt test, Piedallu test and Gillet test. The test score SI5 showed sensitivity of 73% and specificity of 71%. ConclusionsSacroiliac joints have been shown to be capable of producing pain in the low back; however, the diagnostic value of examination tests for sacroiliac joint pain has been questioned previously by other authors. The pilot study of SI5 test score showed good sensitivity and specificity. This study required statistical procedures that yield appropriate results.