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Scapulothoracic – Anatomy, Function and Conditions

Scapulothoracic refers to the functional connection between the shoulder blade (scapula) and the rib cage (thorax), essential for shoulder mobility and arm elevation.

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Things worth knowing about "Scapulothoracic"

Scapulothoracic refers to the functional connection between the shoulder blade (scapula) and the rib cage (thorax), essential for shoulder mobility and arm elevation.

What does scapulothoracic mean?

The term scapulothoracic describes the anatomical and functional relationship between the shoulder blade (scapula) and the rib cage (thorax). Although it is not a true joint in the classical sense – lacking typical joint structures such as cartilage and a joint capsule – this connection is commonly referred to in medicine as the scapulothoracic joint or the scapulothoracic articulation. It is more accurately described as a muscle-guided gliding plane between the underside of the scapula and the posterior thoracic wall.

Anatomy of the scapulothoracic region

The scapula lies flat against the posterior surface of the thorax and is held in place entirely by muscles. The most important muscles that stabilize and move the shoulder blade include:

Serratus anterior muscle: protracts the scapula and holds it against the thorax
Trapezius muscle: elevates, depresses, and rotates the scapula
Rhomboid major and minor muscles: retract the scapula toward the spine
Levator scapulae muscle: elevates the scapula

Between the scapula and the thorax lies loose connective tissue with bursae (fluid-filled sacs) that allow smooth, friction-free gliding movement.

Function and clinical relevance

The scapulothoracic joint is a central component of the shoulder-arm complex. It works closely with the glenohumeral joint (the main shoulder joint between the humerus and the glenoid fossa), the acromioclavicular joint, and the sternoclavicular joint to provide the full range of arm motion.

During arm elevation overhead, the scapulothoracic joint contributes approximately 60 degrees of movement, while the glenohumeral joint accounts for the remaining approximately 120 degrees. This coordinated interaction is known as the scapulohumeral rhythm.

Common conditions and complaints

Scapulothoracic crepitus

A frequent phenomenon is scapulothoracic crepitus – a snapping, grinding, or grating sound or sensation when the shoulder blade moves. Possible causes include:

Inflammation or thickening of the bursae (scapulothoracic bursitis)
Bony prominences (osteophytes) on the scapula or ribs
Muscular imbalances and postural dysfunction
Previous injuries or surgical procedures

Scapular dyskinesis

Scapular dyskinesis refers to abnormal or altered movement of the scapula, often associated with shoulder pain, overuse syndromes, or shoulder instability. Common causes include muscular weakness or imbalances, nerve palsies (e.g., of the long thoracic nerve), or structural injuries.

Scapulothoracic bursitis

Inflammation of the bursae within the scapulothoracic gliding plane can cause pain, swelling, and restricted shoulder mobility. It may result from overuse, poor posture, or direct trauma.

Diagnosis

Evaluation of the scapulothoracic region typically includes:

Clinical examination: assessment of scapular position, range of motion, and muscular symmetry
Imaging: X-ray, ultrasound, or MRI (magnetic resonance imaging) to identify bony changes, bursitis, or soft tissue pathology
Electromyography (EMG): when nerve damage is suspected

Treatment

Treatment of scapulothoracic complaints depends on the underlying cause and may include:

Physiotherapy: targeted strengthening and stretching of scapular stabilizers, posture correction
Manual therapy: mobilization of the shoulder blade and surrounding structures
Pain management: nonsteroidal anti-inflammatory drugs (NSAIDs), local corticosteroid injections
Surgical intervention: in rare cases of persistent symptoms, such as removal of bony prominences or inflamed bursae (bursectomy)

References

Kapandji, I. A. - The Physiology of the Joints, Volume 1: Upper Limb. Churchill Livingstone, Edinburgh, 2007.
Ludewig, P. M. & Reynolds, J. F. - The Association of Scapular Kinematics and Glenohumeral Joint Pathologies. Journal of Orthopaedic & Sports Physical Therapy, 2009; 39(2): 90-104.
Peat, M. - Functional anatomy of the shoulder complex. Physical Therapy, 1986; 66(12): 1855-1865.

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