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Background Pregnancy-related posterior pelvic girdle pain (PPGP) is a common cause of back pain and disability in the postpartum period. The objective of this study was to investigate the efficacy of orthotic support on pain, disability, and motor control in women with pregnancy-related PPGP. Methods Eighty-four women with a clinical diagnosis of pregnancy-related PPGP participated in this randomized controlled trial (RCT). Participants were randomly allocated into three groups (with a ratio of 1:1:1): the pelvic support group, the lumbar support group, and the control group (patient-education leaflet). Pain severity, disability, effort during active straight leg raising test (ASLR), maximum isometric muscle force (hip flexion and trunk rotation), and joint position reproduction (JPR) of hip abduction were assessed as study outcomes. These variables were measured at four time points —before the intervention, immediately after the intervention, at the 4-week follow-up (at this time, the intervention period was terminated), and at the 5-week follow-up (one week after discontinuing the interventions)— to evaluate the possible effects of wearing support. Repeated-measures multivariate analysis of variance (MANOVA) was applied to determine the statistical significance between groups. Bonferroni post-hoc correction was used to identify significant differences between groups at different study time points. Results There was a significant interaction effect for group × time for the study outcomes, including pain severity, disability, effort during ASLR, and maximum isometric muscle force between groups ( p  < 0.001), except JPR of hip abduction ( p  = 0.13). There were statistically significant differences in post hoc comparisons for pain intensity and effort during ASLR in lumbar support versus control condition and for maximum isometric muscle force in orthotic interventions versus control conditions immediately after the intervention ( P  < 0.008). Post hoc tests demonstrated statistically significant differences in orthotic interventions versus control conditions after 4-week and 5-week follow-ups ( P  < 0.008). None of the interventions significantly changed the JPR of hip abduction compared to the control group ( p  > 0.008). The effect sizes for study outcomes were large, except for the JPR of hip abduction. Conclusions For women with pregnancy-related PPGP, both lumbar and pelvic supports were beneficial for decreasing pain and disability symptoms. Lumbar support showed better results for managing PPGP than pelvic support. Clinical trial registration Iranian Registry of Clinical Trials IRCT20150210021034N11. Date of registration: April 31, 2021. Available at: https://irct.behdasht.gov.ir/trial/70670

Pregnancy-related posterior pelvic girdle pain (PPGP) is one of the most important clinical manifestations of postpartum back pain. Those affected often complain of discomfort during daily activities. It is hypothesized that altered motor control is associated with perceived pain. Pelvic support can regulate possible underlying altered motor control mechanisms and decrease pain. However, the influence of a lumbosacral orthosis, which is broader support that allows for a wider contact area and more skin sensory stimulation to restore proper motor function, has not yet been investigated in women with postpartum PPGP. This study investigates the efficacy of broader lumbar support and narrower pelvic support on pain, proprioception, disability, and muscle strength in women with pregnancy-related PPGP. This study will be a single-center, 3-armed, participant-blinded, randomized controlled trial. In total, 84 women diagnosed with pregnancy-related PPGP will be recruited and randomly assigned into 3 groups. Intervention groups A and B will receive pelvic and lumbar supports, respectively. Group C (control) will receive only a patient education leaflet containing advice on strengthening exercises, comfortable positions, and other practical information. The study outcomes are pain, effort score during the active straight leg raising test, maximum isometric hip flexion force, maximum isometric hip external rotation force, maximum isometric trunk rotation force, and joint position reproduction of hip abduction. The study outcomes will be measured at 4 time points: baseline (T1), immediately after the intervention (T2), 4 weeks following interventions began (at this time, the intervention period is completed) (T3), and 1 week after discontinuing the interventions (T4) to evaluate the possible lasting effects of wearing supports. Multivariate analysis of variance will be used to test between- and within-group differences. Recruitment for this study will be started in summer 2022 and is expected to be completed by the end of fall 2022. This study will examine the efficacy of broader lumbar support as an early rehabilitative treatment for women receiving postpartum posterior pelvic pain support compared to those receiving a narrower pelvic support. We expect the broader lumbar support to impact pain management and disability better than the current narrower pelvic belt. Long-term follow-up studies will help determine whether such lumbosacral orthosis reduces pain and improves daily activities in women with pregnancy-related PPGP. Iranian Registry of Clinical Trials IRCT20150210021034N11; https://www.irct.ir/trial/54808. PRR1-10.2196/40553.