Association between gait profile and spinal alignment in patients with adolescent idiopathic scoliosis

This study aimed to investigate the association between gait profile and spinal alignment in adolescent idiopathic scoliosis (AIS). The study group consisted of 80 AIS and 80 healthy controls. All participants underwent radiographic imaging and measured gait analysis. The gait profile included gait speed, step length, stance phase, cadence, single leg support, double legs support, gait asymmetry (GA), and phase coordination index (PCI). The spinal alignment parameters included pelvic tilt (PT), sacral slope (SS), pelvic incidence (PI), thoracic kyphosis (TK), lumbar lordosis (LL), sagittal vertical axis (SVA), and coronal balance (CB). The mean age of the AIS group was 15.1 years, while the control group was 14.6 years. Significant differences were observed between the AIS patients and controls in gait speed, step length, stance phase, cadence, single leg support, double legs support, GA, PT, TK, SVA, and CB. However, no significant differences were found in PCI, SS, PI, and LL (p > 0.05). Additionally, correlation analysis revealed a close relationship between gait profile and spinal alignment parameters. Step length was significantly related to PT, SS, and LL, while GA was correlated with TK in AIS patients. Multiple regression analysis for predictors of step length found that PT and SS accurately predicted step length. First, the AIS group showed significant differences in gait kinematics and spinal alignment compared to the control group. Second, statistically significant correlations were found between gait profile and spinal alignment parameters. Specifically, PT and SS accurately predicted step length, and TK was correlated with GA in AIS patients.