Which system is most associated with rotational movement of the trunk during locomotion?

• A. Anterior Oblique Sling System
• B. Posterior Oblique System
• C. Deep Longitudinal System
• D. Lateral System

Answer: (B)

Rotational movement during locomotion is driven by the posterior oblique system. This diagonal sling links the opposite sides of the body: the latissimus dorsi on one side and the gluteus maximus on the other, connected through the thoracolumbar fascia. In gait, as one leg drives forward, this sling twists the trunk and pelvis, transferring energy from the lower body to the upper body and producing controlled trunk rotation that stabilizes and propels you forward. Other systems contribute to stability or different movement patterns, but the posterior oblique sling is the primary mechanism that facilitates rotation during walking or running.