Exploring the Effects of Standardized Soft Tissue Mobilization on the Viscoelastic Properties, Pressure Pain Thresholds, and Tactile Pressure Thresholds of the Cesarean Section Scar

Objectives of soft tissue mobilization applied to cesarean section (C-section) scars are to decrease stiffness and to reduce pain. Research investigating these effects is lacking. The authors conducted a descriptive, exploratory, proof-of-concept clinical study. Women aged 18 to 40 years who had undergone at least one C-section were recruited. A trained osteopath performed standardized mobilization of the C-section scar once a week for 2 weeks. Scar quality and pain characteristics, viscoelastic properties, pressure pain thresholds, and tactile pressure thresholds were measured before and after each session. Paired Student's -tests and Friedman's test with Dunn-Bonferroni adjustment were performed to assess the immediate and short-term effects of mobilizations. Kendall's and Cohen's were calculated to determine effect sizes over the short term. Simple bootstrapped bias-corrected and accelerated 95% median confidence intervals were computed. Thirty-two participants completed the study. The Patient and Observer Scar Assessment Scale questionnaire revealed differences with small and moderate effects for stiffness ( = 0.021,  = 0.43), relief ( < 0.001,  = 0.28), surface area ( = 0.040,  = 0.36), flexibility ( = 0.007,  = 0.52), and participant opinion ( = 0.001,  = 0.62). Mobilizations increased elasticity ( < 0.001,  = 0.11), decreased stiffness ( < 0.001,  = 0.30), and improved pressure pain thresholds ( < 0.001,  = 0.10) of the C-section, with small to moderate effects. The results also showed decreased tone and mechanical stress relaxation time, as well as increased tactile pressure thresholds at the different measurement times ( < 0.05), but trivial effect sizes ( < 0.10). Creep showed trivial effect and no significant difference ( = 0.09). This study showed that two sessions of mobilization of C-section scar might have a beneficial effect on some viscoelastic properties of the C-section as well as on pain. Some variables of interest useful for future empirical studies are highlighted. ClinicalTrial. Gov NCT04320355.