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Shoulder – Anatomy, Conditions and Treatment

The shoulder is the most mobile joint in the human body. It connects the arm to the trunk and allows a wide range of movements in nearly every direction.

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Things worth knowing about "Shoulder"

The shoulder is the most mobile joint in the human body. It connects the arm to the trunk and allows a wide range of movements in nearly every direction.

What is the Shoulder?

The shoulder is a complex anatomical region that connects the arm to the trunk. It is considered the most mobile joint in the human body, allowing movements in nearly every direction – including lifting, lowering, rotating, and circling the arm. This exceptional range of motion, however, comes at the cost of stability, making the shoulder particularly susceptible to injuries and degenerative conditions.

Anatomy of the Shoulder

The shoulder region consists of several key structures:

Glenohumeral joint: The main shoulder joint, formed between the head of the humerus (upper arm bone) and the glenoid cavity of the scapula (shoulder blade). It is a ball-and-socket joint with a wide range of motion.
Acromioclavicular (AC) joint: The connection between the clavicle (collarbone) and the acromion (part of the shoulder blade).
Sternoclavicular joint: The connection between the clavicle and the sternum (breastbone).
Rotator cuff: A group of four muscles and their tendons (supraspinatus, infraspinatus, teres minor, subscapularis) that stabilize the shoulder joint and enable rotational movements.
Bursa: Fluid-filled sacs that reduce friction between tendons and bones.
Joint capsule and ligaments: Stabilizing structures that surround and protect the joint.

Common Shoulder Conditions and Injuries

Shoulder Impingement Syndrome

Shoulder impingement occurs when tendons or the bursa are pinched in the narrow space beneath the shoulder arch (acromion). This leads to pain when lifting the arm and is one of the most common shoulder conditions.

Rotator Cuff Tear

A rotator cuff tear can result from an acute injury (such as a fall) or from chronic wear and tear. Typical symptoms include pain and reduced arm strength, especially when lifting the arm to the side.

Shoulder Instability and Dislocation

Due to its exceptional mobility, the shoulder joint is the most frequently dislocated joint in the body. In cases of shoulder instability, the glenoid cavity may be too shallow or the stabilizing structures may be weakened, allowing the humeral head to slip out of the socket.

Frozen Shoulder (Adhesive Capsulitis)

Frozen shoulder is an inflammatory condition of the joint capsule that leads to progressive stiffness and significant pain. It can occur spontaneously or develop following an injury or surgical procedure.

Shoulder Osteoarthritis (Omarthrosis)

Shoulder osteoarthritis describes the degeneration of the articular cartilage within the shoulder joint. It causes pain, stiffness, and restricted mobility, particularly in older adults.

Bursitis

Shoulder bursitis results from overuse or inflammation of the bursa. Affected individuals typically report tenderness on pressure and swelling in the shoulder area.

Symptoms of Shoulder Problems

Common symptoms associated with shoulder conditions include:

Pain at rest or during movement
Restricted range of motion in the arm
Weakness when lifting or carrying
Clicking or grinding sensations in the joint
Swelling or tenderness
Pain radiating down the arm or into the neck

Diagnosis of Shoulder Complaints

Shoulder conditions are diagnosed through:

Physical examination: Assessment of range of motion, strength, and pain points by a physician.
Imaging: X-rays reveal bony changes, while ultrasound and MRI (magnetic resonance imaging) provide detailed visualization of soft tissues such as tendons and muscles.
Arthroscopy: A minimally invasive procedure allowing direct visualization and, if necessary, treatment of the inside of the joint.

Treatment of Shoulder Conditions

Conservative Treatment

Many shoulder problems can be managed without surgery:

Physiotherapy: Targeted strengthening and stretching exercises to stabilize and mobilize the joint.
Pain relievers and anti-inflammatory medications: Nonsteroidal anti-inflammatory drugs (NSAIDs) such as ibuprofen help reduce pain and inflammation.
Corticosteroid injections: Targeted injections into the joint or bursa to reduce inflammation.
Rest and immobilization: Beneficial in the short term for acute injuries.

Surgical Treatment

In severe or treatment-resistant cases, surgery may be required:

Arthroscopic procedures: Minimally invasive repair of tendon tears or removal of inflamed tissue.
Shoulder replacement: In advanced osteoarthritis, an artificial shoulder joint (prosthesis) may be implanted.

Prevention of Shoulder Problems

The following measures can help prevent shoulder complaints:

Regular strengthening of the muscles surrounding the shoulder
Ergonomic working and sitting postures
Warming up before sports and physical activities
Avoiding overuse and incorrect loading of the shoulder

References

German Society for Orthopaedics and Trauma Surgery (DGOU): Guidelines on Shoulder Disorders, 2022.
Neer CS. Impingement lesions. Clinical Orthopaedics and Related Research, 1983; 173:70-77.
Matsen FA, Fehringer EV, Lippitt SB, Wirth MA, Rockwood CA. Rockwood and Matsen's The Shoulder. 5th ed. Elsevier, 2017.

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