Impact of Physiotherapy Based on the Rigo Concept and Whole-Body Vibration on Sagittal Spinal Curvatures, Trunk Symmetry, and the Angle of Trunk Rotation in Adolescents with Idiopathic Scoliosis

Background: Conservative treatment for adolescent idiopathic scoliosis (AIS) includes physiotherapeutic scoliosis-specific exercises (PSSE) and bracing. One PSSE-based approach is the Rigo Concept, which emphasizes three-dimensional (3D) postural correction, expansion techniques, muscle activation, and postural integration. Recently, increasing interest has been directed toward incorporating whole-body vibration (WBV) into physiotherapy. WBV is a reflex-based neuromuscular training method shown to improve muscle strength and power and enhance proprioception, which may be beneficial in the treatment of AIS. Objectives: This study aimed to assess the effects of physiotherapy based on the Rigo Concept combined with WBV on sagittal spinal curvatures, trunk symmetry, and the angle of trunk rotation (ATR) in girls with AIS. Methods: This prospective controlled experimental study included 45 girls (12.8 ± 1.7 years) with AIS who participated in a 5-day physiotherapy session based on the Rigo Concept. Of these, 22 participants additionally received WBV using a Galileo Med 35 platform (3 × 3 min/day, frequency 25 Hz, peak-to-peak displacement 2 mm), forming the Rigo–WBV group. The remaining participants received the Rigo Concept alone (Rigo–ONLY). Participants were allocated to the study groups using a quasi-random method based on the order of enrollment. ATR was defined as the primary endpoint, while thoracic kyphosis, lumbar lordosis, sacral slope, coronal balance, and scapular position were considered secondary outcomes. All outcomes were assessed before and after the intervention. Results: Neither the Rigo–WBV nor the Rigo–ONLY intervention affected sagittal spinal curvatures (p > 0.05). Coronal balance improved in both the Rigo–WBV (Δ 0.5 cm, p < 0.001) and Rigo–ONLY groups (Δ 0.4 cm, p = 0.005). In the Rigo–ONLY group, an improvement in scapular height asymmetry was observed (Δ 1.1°, p = 0.010). Following the Rigo–WBV intervention, ATR decreased in the main thoracic (Δ 1.9°, p < 0.001), thoracolumbar (Δ 1.9°, p < 0.001), lumbar curve (Δ 2.1°, p < 0.001), and pelvis (Δ 1.0°, p < 0.001). In the Rigo–ONLY group, a reduction in ATR was observed only in the thoracolumbar curve (Δ 1.9°, p < 0.001). Conclusions: In terms of clinical and postural changes, five-day physiotherapy based on the Rigo Concept, with or without WBV, does not influence sagittal spinal curvatures in girls with AIS. Both interventions may improve coronal balance. Moreover, the Rigo Concept combined with WBV may reduce ATR.