What is considered the "setting phase" for the scapula in the first degrees of elevation?

The setting phase of scapular motion during shoulder elevation is characterized by minimal scapular movement. This initial phase is crucial as it allows for the stabilization of the glenohumeral joint (GH joint) before significant movement of the scapula occurs. Essentially, during the first few degrees of arm elevation, the scapula primarily serves to maintain the shoulder girdle's alignment and stability, ensuring that the humerus can move efficiently without risking injury or impingement.

This phase is important for proper biomechanics of the shoulder, as it allows the rotator cuff muscles to engage effectively and helps to prevent dysfunction. As elevation continues beyond a certain point, scapular movement becomes more prominent to facilitate further arm elevation, but in the very initial degrees, the emphasis is on stability rather than mobility. This foundational stability provided by the scapula is vital for the subsequent phases of shoulder movement.