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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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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