In gait, which statement best describes the relationship between shoulder girdle movement and pelvis movement?

In gait, which statement best describes the relationship between shoulder girdle movement and pelvis movement?

• A. They rotate in opposite directions to coordinate trunk movement
• B. They rotate in the same direction to enhance limb swing
• C. They move independently with no coordination
• D. They rotate only in the frontal plane

Answer: (A)

In gait, the trunk stays aligned and energy is saved by a counter-rotation between the pelvis and the shoulder girdle. The pelvis rotates in the transverse plane as the legs move, and the shoulder girdle rotates in the opposite direction. This opposite rotation helps keep the trunk oriented forward, supports smooth and balanced arm swing, and reduces twisting forces on the spine. If both regions rotated the same way, the trunk would twist more in one direction, increasing spinal torsion and making walking less efficient. Movement here is primarily in the transverse plane, and the pelvis and shoulder girdle are coordinated rather than acting independently. The opposite rotations work together to harmonize limb motion with trunk stability, producing a more economical and stable gait.

In gait, the trunk stays aligned and energy is saved by a counter-rotation between the pelvis and the shoulder girdle. The pelvis rotates in the transverse plane as the legs move, and the shoulder girdle rotates in the opposite direction. This opposite rotation helps keep the trunk oriented forward, supports smooth and balanced arm swing, and reduces twisting forces on the spine. If both regions rotated the same way, the trunk would twist more in one direction, increasing spinal torsion and making walking less efficient.

Movement here is primarily in the transverse plane, and the pelvis and shoulder girdle are coordinated rather than acting independently. The opposite rotations work together to harmonize limb motion with trunk stability, producing a more economical and stable gait.