In this study evaluated the prevalence of sacroiliac joint dysfunction in patients with lumbar disc hernia and examined the variations in clinical parameters cause by this combination.

Two hundred thirty-four patients already diagnosed with lumbar disc hernia were included in the study. During the evaluation, sacroiliac joint dysfunction was investigated using specific tests, pain levels with a Visual Analog Scale, and the presence of neuropathic pain using the Leeds Assessment of Neuropathic Symptoms and Signs Pain Scale. Other clinical assessments were performed using the Beck Depression Inventory, Health Assessment Questionnaire, and Tampa Kinesiophobia Scale. Positivity in three out of six provocation tests was adopted as a criterion for sacroiliac joint dysfunction.

Sample Size A power analysis using the formula n= t2pq / d2 was performed to determine the sample size. Based on those data the investigators concluded that a minimum of 174 and a maximum of 322 patients would be required to achieve significant results, and 234 patients were enrolled.

Statistical Analysis The study data were expressed as mean plus standard deviation (SD) for constant variables values and as number and percentage for categoric variables. The chi-square test was used to analyze categoric variables. Results were evaluated at a 95% confidence interval at a significance level of p˂0.05. The analysis was performed on Statistical Package for the Social Sciences (SPSS) for Windows 16.0 software.

The Strengthening the Reporting of Observational Studies in Epidemiology (STROBE) guideline has been implemented in this manuscript.

Inclusion Criteria:

• Between 20 - 60 years old
• Diagnosis of lumbar disc herniation
• To have sufficient cognitive level to fill clinical evaluation forms
• The patient agreed to participate in the study

Exclusion Criteria:

• Lumbar pain, the etiology of which was suspected to be inflammatory in character
• Structural vertebral deformity or fracture
• The severe and progressive neurological deficit
• A history of severe psychiatric disease
• Substance and/or alcohol dependence, with uncontrolled diabetes mellitus (DM), malignancy, spinal infection
• A history of vertebral surgery
• Pregnancy

Two hundred thirty-four patients already diagnosed with lumbar disc hernia were included in the study. 63.2% of patients were female and 36.8% were male. Mean age was 46.72 ± 11.14 years.

From an ethical point of view, this data should remain between the doctor and the patients. Therefore a plan is not created.