Instabilities and dislocations of the shoulder

Anatomy: Why the shoulder is so mobile – and vulnerable

The glenohumeral joint (main shoulder joint) consists of the spherical head of the humerus and the relatively flat socket (glenoid) of the shoulder blade. This construction-related “flatness” allows for great freedom of movement, but requires stable soft tissue structures for a secure hold.

• Labrum: cartilaginous edge of the socket, increases the contact surface and serves as an attachment for the joint capsule.
• Capsular ligament apparatus: front, back and lower ligaments stabilize especially in end positions.
• Rotator cuff: Supraspinatus, infraspinatus, teres minor and subscapularis tendons actively center the humeral head.
• Scapula control: the position of the scapula significantly influences ball-and-socket guidance.
• AC joint and coracoclavicular ligaments: important for power transmission between the arm and torso.

If the interaction between passive (labrum, capsule, ligaments) and active (muscles, neuromuscular control) stability becomes unbalanced, the risk of instability or dislocation increases.

What are instabilities and what is a dislocation?

Shoulder instability refers to a recurring feeling of insecurity, subluxating (partially evasive) movements or stress-dependent pain because the head of the humerus is not reliably guided in the socket. A dislocation is a complete dislocation - often acutely painful with restricted movement and visible deformity.

• Directions: anterior (forward), posterior (backward) and inferior (downward) instabilities/dislocations.
• Origin: traumatic (e.g. fall, contact sports) or atraumatic (e.g. connective tissue laxity, hypermobility, muscular imbalance).
• Extent: unidirectional (one direction) vs. multidirectional (multiple directions).
• Course: first event vs. recurrent instability/dislocation.

Important: Not all instability requires surgery. The aim is to improve active stability and reduce the risk of further events through targeted, individually controlled therapy.

Forms and subtopics – overview

The following pages delve deeper into typical shapes and special features. They help to better classify complaints and understand possible treatment options.

• Shoulder dislocation anterior: anterior dislocation - most common form (/diseases/shoulder/instability-dislocations/shoulder-dislocation-anterior/)
• Posterior shoulder dislocation: posterior dislocation – rarer, often overlooked (/diseases/shoulder/instability-dislocations/shoulder-dislocation-posterior/)
• Inferior shoulder dislocation: rare downward dislocation (/diseases/shoulder/instability-luxations/shoulder-dislocation-inferior/)
• Recurrent shoulder dislocation: recurring dislocations (/diseases/shoulder/instability-dislocations/recurrent-shoulder-dislocation/)
• Multidirectional shoulder instability: multiple directions affected (/diseases/shoulder/instability-dislocations/multidirectional-shoulder-instability/)
• Hypermobility of the shoulder: hypermobile capsule/ligaments (/diseases/shoulder/instability-dislocations/hypermobility-shoulder/)
• AC joint sprain: Injury to the acromioclavicular joint (/diseases/shoulder/instability-luxations/ac-joint sprain/)
• Muscles, tendons, ligaments – role of active stability (/diseases/shoulder/muscles-tendons-ligaments/)
• Joint structures / cartilage / capsule – passive stability (/diseases/shoulder/joint-structures-cartilage-capsule/)

Typical symptoms and warning signs

• Sudden “dislocation” with severe pain, protective posture and deformation of the shoulder.
• Feeling of insecurity or tipping over in certain positions (e.g. arm abducted and externally rotated).
• Cracking/snapping, recurring feelings of subluxation.
• Loss of strength, fatigue during overhead activities.
• After the event: swelling, restricted movement, possibly discomfort in the arm.

Immediate clarification is advisable if there is numbness, circulatory problems in the hand, severe deformity or persistent, severe pain. Such signs may indicate nerve or vascular involvement and are an emergency.

Causes and risk factors

• Trauma: Fall on an outstretched arm, collision in sports, jerky pull.
• Labral and capsular lesions (e.g. Bankart lesion) secondary to dislocation.
• Bone involvement: Glenoid defects or Hill-Sachs impression on the humeral head.
• Hypermobility/connective tissue laxity, multidirectional instability.
• Muscular imbalance, inadequate shoulder blade control.
• Early age and contact sports increase the risk of recurrence after initial dislocation.

The more precisely the structural and functional cause is identified, the more targeted treatment can be – conservative or, if necessary, surgical.

Diagnostics in our practice in Hamburg

Careful diagnosis is the basis for effective therapy. We take time for anamnesis, clinical examination and – depending on the question – imaging procedures.

On this basis, we create an individual therapy plan - with clear goals, stages and re-evaluations.

Conservative therapy first: actively regain stability

For many instabilities, especially atraumatic and functional forms, structured, supervised rehabilitation is the treatment of first choice. Even after an initial dislocation, a conservative approach can make sense - depending on age, sport, tissue damage and needs.

• Acute phase: short-term immobilization in a suitable sling, pain and inflammation management according to medical recommendations, early functional, pain-adapted mobilization.
• Neuromuscular control: Improvement of sensorimotor control, responsiveness and proprioception.
• Scapular stability: targeted training of the scapular muscles for stable joint centering.
• Strength building rotator cuff: dosed, technically clean, with a focus on quality instead of quantity.
• Posture and technique training: ergonomic everyday patterns, sport-specific corrections.
• Taping/Orthotics: situational support for sports/everyday life, does not replace training.
• Return to sport/exercise: criteria-based (freedom from pain, full function, strength symmetry), not calendar-based.

Duration and content are individual. A typical rehabilitation process includes several phases over weeks to a few months, with regular adjustments to the healing process and the patient's goals.

Acute dislocation: what to do?

• Do not reposition (adjust) yourself. There is a risk of injury to nerves, vessels and additional structures.
• Protect your arm and keep it as immobile as possible, e.g. B. in a supportive posture.
• Cooling to relieve pain/swelling (pay attention to skin protection, take breaks).
• If you have circulatory problems, numbness or severe misalignment, consider calling emergency medical attention as soon as possible.

After medical care, judicious follow-up treatment is crucial to reduce the risk of further dislocations.

When does an operation make sense?

Surgical measures are considered if there is relevant instability despite consistent conservative therapy or if structural damage limits stability. The decision is made individually and based on evidence after detailed information about the benefits, risks and alternatives.

• Recurrent dislocations/subluxations with functional impairment.
• Severe labral/capsular damage (e.g. Bankart lesion) with signs of instability.
• Relevant bony defects of the glenoid or an “engaging” Hill-Sachs lesion.
• Young, competitive contact or overhead athletes with a high risk of recurrence.
• Professional requirements with unavoidable risk positions.

Possible procedures (examples): arthroscopic stabilization/Bankart repair, capsular shift/plication, remplissage, bony stabilization procedures for bony defects (e.g. laterjet/bone block concepts). The choice depends on the findings and objectives. Rehabilitation and adherence are crucial for the outcome.

Regenerative and complementary procedures – what is realistic?

In conservative orthopedics, depending on the accompanying findings, among other things: Injection therapies (e.g. for tendon irritation) are discussed. To date, evidence for regenerative procedures for the actual stabilization of an unstable shoulder is limited.

• PRP/autologous blood or hyaluronic acid: can modulate pain in certain accompanying problems (e.g. tendinopathies); a stabilizing effect on the capsule/labrum is not certain.
• The guiding principle of treatment remains structured, function-oriented rehabilitation; Injections are at best supplementary – according to indication and information.

Prevention and self-exercises

The goal is a resilient shoulder girdle with good neuromuscular control. Prevention begins in everyday life and continues in sport.

• Warm up and progressively increase the load, especially before overhead activities.
• Technical training and ergonomics: avoid unfavorable levers and “risk positions”.
• Train scapula and trunk stability regularly; Strengthen the rotator cuff in a balanced manner.
• Incorporate proprioception exercises and reactive stabilization.
• For hypermobility: focus on stability, not stretchability; Have exercises individually instructed.

Your visit to Hamburg-Winterhude

Our practice at Dorotheenstrasse 48, 22301 Hamburg, specializes in shoulder problems. We combine careful diagnostics with clear, understandable therapy planning. You will receive an individual exercise and rehabilitation concept; We discuss surgical options transparently if they make medical sense.

We would be happy to advise you on returning to work and sport, aids in everyday life and measures to keep your shoulder stable in the long term.