Articles

What is Scapulothoracic articulation?

What is Scapulothoracic articulation?

The scapulothoracic joint is not a true synovial joint. Rather, the scapulothoracic articulation is formed by the convex surface of the posterior thoracic cage and the concave surface of the anterior scapula. It is attached to the axial skeleton through the acromioclavicular joint and the sternoclavicular joint.

What are the 4 articulations of the shoulder?

Four joints are present in the shoulder: the sternoclavicular (SC), acromioclavicular (AC), and scapulothoracic joints, and glenohumeral joint.

What happens when the humerus is abducted 120 degrees?

That means that most of the glenohumeral abduction and the scapular upward rotation will be occurring at the same time. Figure 1 shows the humerus in 120 degrees of abduction. At this point you will notice that some of the motion has occurred at the glenohumeral joint and some at the scapulothoracic articulation.

Why is shoulder abduction called the scapulohumeral rhythm?

One of the reasons for this extensive range is that shoulder abduction is much more complex than movement at the glenohumeral joint alone. Abduction requires coordinated movement of the glenohumeral joint and the scapulothoracic articulation and this is called the scapulohumeral (or scapulothoracic) rhythm.

Why is there a problem with the scapulohumeral joint?

In the case of these athletes, because of the combined movements exerting the scapulohumeral joint, this type of dislocations has an increased incidence in our days, which indicates the need to develop suppleness. The horse with acute/recent olecranon bursitis suffers from the problem of flexion and extension of scapulohumeral joint.

Is the scapulothoracic joint a true anatomic joint?

The Scapulothoracic (ST) “joint” is not a true anatomic joint as it has none of the usual joint characteristics (union by fibrous, cartilaginous, or synovial tissues). It is an articulation of the scapula with the thorax which depends on the integrity of the anatomic Acromioclavicular (AC)and Sternoclavicular (SC)joints.

Which is an articulation of the scapula with the thorax?

It is an articulation of the scapula with the thorax which depends on the integrity of the anatomic Acromioclavicular (AC) and Sternoclavicular (SC) joints.