Shoulder abduction requires rotation around which axis?

Shoulder abduction primarily involves movement of the arm away from the body in the coronal plane, and this movement occurs around the Z axis. In biomechanical terms, the Z axis is typically defined as the vertical axis that runs from the top of the head to the feet. During abduction, the shoulder joint rotates around this axis while the arm elevates outward.

Understanding the role of the Z axis in shoulder abduction is crucial for analyzing the mechanics of upper limb movement, especially in activities that require lifting or reaching. The coordination of muscles around the shoulder, particularly the deltoid and supraspinatus, works in tandem to facilitate this movement along the Z axis while providing stability to the joint throughout the range of motion.

This axis is essential for correct and efficient movement patterns, ensuring that mechanics align properly for activities where shoulder positioning is critical.