Line of gravity relative to upright vertebral posture

Area of Science:

• Biomechanical analysis
• Human anatomy
• Adolescent health

Background:

• Understanding sagittal thoracolumbar spine posture is crucial for assessing spinal health.
• Previous research has explored spinal curvature, but detailed analysis of vertebral centroids relative to the line of gravity in adolescents is limited.

Purpose of the Study:

• To investigate sagittal thoracolumbar spine posture using vertebral centroids.
• To determine the relative position of vertebral centroids to the body's line of gravity.
• To identify gender-based differences in adolescent spinal posture.

Main Methods:

• A non-invasive method utilizing back skin profiles to calculate the thoracolumbar centroid curve in the sagittal plane.
• Evaluation of 28 male and 15 female adolescents aged 14–15 years.
• Statistical analysis to compare gender differences and correlations with anthropometric factors.

Main Results:

• Significant differences in vertebral centroid position relative to the line of gravity between genders (females more posterior, P < 0.05).
• Males demonstrated a significantly greater degree of kyphotic curvature compared to females (P < 0.05).
• Spinal posture (kyphotic and lordotic curvatures) significantly correlated with cumulative centroid displacement, gender, height, mass, and spine depth (r(2) 0.71 and 0.51).

Conclusions:

• Adolescent thoracolumbar spine posture exhibits significant gender-related variations in its relationship with the line of gravity.
• Kyphotic and lordotic curvatures are influenced by gender and anthropometric factors, impacting sagittal spinal alignment.
• These findings contribute to a better understanding of normal and potentially abnormal spinal development in adolescents.