Reason 1: Shoulder and spleen bones extend forward.

self-check

Relax and stand naturally, and observe the position of scapula from the midline. In good posture, the medial edges of acromion bones are basically parallel, and the distance between acromion bones on both sides is about 10cm. If this distance is exceeded, the anterior acromion bone can be considered.

What is shoulder and spleen bone extension? Do you know that?/You know what?

Internal rotation of shoulder and spleen refers to the scapula sliding away from the spine and moving according to the shape of the chest. It should be noted that scapular pronation is often accompanied by the pronation of the skull, and the shoulder joint may also move forward due to scapular pronation, thus increasing the risk of collision between the skull and acromion, resulting in shoulder pain.

Do you understand why the shoulder and spleen bones stretch forward?

The serratus serratus and pectoralis minor, which are responsible for the extension of the shoulder and foot bones, are tense and short, pulling the acromion bone forward, while the withering muscle and trapezius muscle, which are responsible for the retraction of acromion bone, are weak in the middle and lower bundles, resulting in the acromion bone being extended forward for a long time.

Reason 2: Internal rotation of brain bone.

self-check

Stand, hold the pen, relax, hang your arms naturally, stand naturally after closing your eyes for 30 seconds, and observe the direction of the pen:

Point to 0- 1 point, normal posture.

Pointing to 1-2, poor posture.

Pointing to 2-3 points, excessive internal rotation

You can also help to judge by observing the cubital fossa. If the elbow socket is inward under the natural relaxation state, the problem of internal rotation of the brain bone can also be considered.

What is brain pronation? Are you clear?

In a normal resting position, the brain bones will have slight pronation, but some people will have excessive pronation. Internal rotation of the skull often occurs at the same time as shoulder and spleen extension, so it is more common in people with shoulder extension than in normal posture.

Do you understand why the brain rotates internally?

Working at a desk for a long time leads to the tension and contraction of teres major, deltoid toe, subacromial muscle, pectoralis major and latissimus dorsi, which are responsible for internal rotation of the brain, while the tension and weakness of deltoid toe, infraspinatus and teres minor, which are responsible for external rotation of the brain. The external rotation of the brain bone is unable to resist the internal rotation, which makes the brain bone in the internal buckle state for a long time, leading to the appearance of the round shoulder.

Protrusion of shoulder and spleen