Twenty patients (11 males, 9 females) aged 20–50 years old with MRI-proven unilateral LDH were included IN 2010 if they had SLDD in the L4-L5 or L5-S1 segment concomitant with ipsilateral SIJ hypomobility (Table 1). Leg pain during 1 to 10 months before the study was their major complaint, and the mean level of leg pain during the previous 24 h was 30–70 out of 100 on a 0–100 numerical rating scale (NRS). The time interval allowed between the MRI diagnosis and inclusion in the study was 3 months. Exclusion criteria were sequestrated LDH with neurological signs, spinal canal stenosis, spondylolisthesis, previous lumbar surgery and gross instability. Patients a with positive well straight leg raise (SLR) test, indicating rather large disc herniation and poor prognosis for conservative treatments [15, 16], were also excluded.Table 1Participants’ demographic characteristics (N = 20)VariableValueaAge37.86 ± 9.62BMI25.10 ± 3.12Side of LDHRight11 (55)Left9 (45)Side of SIJ hypomobilityRight8 (40)Left12 (60)Segment of LDHL4 - L55 (25)L5 - S115 (75)Abbreviations: BMI body mass index, LDH lumbar disc herniation, SIJ sacroiliac jointaValues are mean ± SD for continuous variables and number (percentage) for categorical variables