Anterior shoulder dislocation

What is an anterior shoulder dislocation?

An anterior shoulder dislocation is the dislocation of the head of the humerus forward out of the socket (glenoid). The shoulder is the most mobile joint in the body - this mobility also makes it susceptible to instability. Common triggers are a fall onto an outstretched arm or an abrupt movement in abduction and external rotation, such as during sports.

During the initial dislocation, soft tissue structures such as the articular lip (labrum) and the capsular ligament structures can be injured (e.g. Bankart lesion). In addition, an indentation can occur on the head of the humerus (Hill–Sachs dent). The risk of re-dislocation depends largely on age, activity level and the extent of structural damage.

Anatomy and mechanics of the shoulder

The shoulder joint consists of the head of the upper arm (humeral head) and the relatively small socket of the shoulder blade (glenoid). The articular lip (labrum) enlarges the socket surface, while the capsule and ligaments – especially the lower glenohumeral ligament (IGHL) – stabilize it. The rotator cuff and shoulder blade muscles provide dynamic stability.

• Labrum (joint lip): ring-shaped fibrocartilage structure for stabilization
• Capsule-ligament apparatus: limits extreme movements and keeps the head in the socket
• Rotator cuff: active centering of the humeral head
• Hill–Sachs dent: impression injury to the head of the humerus after dislocation
• Bankart lesion: Detachment of the anterior-inferior labrum, often in anterior dislocation

Causes and risk factors

An anterior dislocation usually occurs traumatically. The force acts in such a way that the head of the humerus moves forward and downward. In addition to acute accidents, individual risk factors play a role.

• Trauma: Falling onto an outstretched arm, tackling, falling while cycling or skiing
• Sports with contact or overhead impact: handball, rugby, American football, volleyball
• Age: higher risk of recurrence in adolescents and young adults
• Structural attachment disorders: flat socket, bony defects (loss of the glenoid edge)
• Soft tissue weakness or hypermobility: generalized connective tissue laxity
• Previous dislocation: stability structures that have already been loosened or thinned out

Symptoms and warning signs

• Sudden, severe shoulder pain with inability to move
• Visible/tactile deformation, “shoulder protrudes”
• Protective tension and protective posture (arm on the body, slight abduction)
• Tingling or numbness over the side of the shoulder (indicating irritation of the axillary nerve)
• Loss of strength, especially when raising the arm
• After reduction: feeling of insecurity, “feeling of being dislocated” in certain positions

Emergency advice: If you have any circulatory or sensory problems or severe pain, you should seek immediate medical attention. An uncontrolled attempt at self-reduction is not recommended.

First measures for acute dislocation

• Rest your arm (sling) and move your shoulder as little as possible
• Cooling to reduce pain and swelling (e.g. cold pack wrapped in cloth)
• No sudden attempts at reduction without specialist guidance
• See a doctor quickly for assessment, imaging and gentle reduction

Diagnostics in practice

The aim is to reliably recognize the dislocation, record accompanying injuries and assess the risk of recurrence. After a gentle reduction, stability and nerve/vascular status are checked.

• History: mechanism of accident, first or recurrent dislocation, sporting requirements
• Clinical examination: position, stability tests (after acute pain has subsided), neurological status (axillary nerve), blood flow
• X-ray (ap.-p., Y/outlet, axial view): direction of dislocation, bony injuries
• Ultrasound: effusion, rotator cuff (especially in patients > 40 years old)
• MRI/MR arthrography: labral/capsular damage (Bankart), Hill–Sachs, capsular insufficiency
• CT (if necessary 3D): Quantification of bony defects (glenoid edge loss, bony Bankart)

Conservative treatment and rehabilitation

After gentle reduction, conservative therapy is the priority - especially in the case of initial dislocation without relevant bony defects and in patients with a moderate activity profile. The aim is to reduce pain, heal the soft tissues and rebuild dynamic stability.

• Short-term immobilization: usually 1–2 weeks in an arm sling; Duration individual
• Pain and inflammation management: cooling, medication if necessary (if tolerated and prescribed by a doctor)
• Early, guided physiotherapy: passive/assistive movements in low-pain areas
• Gradual strength development: rotator cuff, scapular stability, proprioception
• Everyday modification: Avoiding risky positions (abduction + external rotation) initially
• Return-to-Activity: everyday stress increase concept with functional criteria

Regenerative processes such as B. PRP are not established for pure labral/capsular injuries. They can be discussed in individual cases for accompanying tendon problems; the evidence is currently limited and individual education is required.

When does an operation make sense?

Stabilization surgery is considered if there is a high risk of recurrence or if the shoulder remains unstable despite consistent therapy. The decision-making criteria are findings, activity profile and personal goals.

• Recurrent dislocations or a pronounced feeling of instability
• Young age and high risk contact/overhead sports
• Significant bony defect of the socket (often > 15–20% glenoid loss)
• “Engaging” Hill–Sachs lesion (occurs at risk)
• Large bony Bankart fracture
• Unsuccessful conservative course over several months with functional limitation

Surgical procedures for anterior instability

The aim of the operation is the anatomical reconstruction of the stabilizing structures and the restoration of reliable joint mechanics. Procedures are selected individually based on the defect pattern.

• Arthroscopic Bankart repair: reattachment of the labrum anteriorly and inferiorly with anchors; often with capsular tightening (plication) to increase tension
• Remplissage: additional stabilization in the case of an involved Hill–Sachs lesion by inserting tendons/capsules into the dent
• Latarjet procedure (bone block): Relocation of the coracoid process in the event of relevant glenoid loss or failure of previous stabilization
• Open stabilization/bone block alternatives: in selected cases, e.g. B. Bony Bankart fixation

Follow-up treatment: As a rule, there is a short-term immobilization (usually 3-4 weeks, depending on the technique), followed by gradual movement build-up and strength training. A resilient return to contact sports usually takes several months. Times are individual and depend on the procedure.

Possible risks are discussed in advance, including: Bleeding, infection, stiffness, nerve irritation, renewed instability. Realistic expectation management is part of serious information.

Course, prognosis and prevention

The risk of recurrent dislocations depends on age and activity. Younger patients with contact sports have statistically higher repetition rates than older patients with lower levels of stress. Structured rehabilitation improves neuromuscular control and can reduce the risk of recurrence.

• Prevention through targeted training of the rotator cuff and scapular control
• Technical training in sports and gradual increase in load
• If necessary, temporary sports orthoses in risky situations
• Avoid extreme positions that promote instability in the early phase

Everyday life, work and sport: realistic timelines

The return to everyday life takes place individually. Office work is often possible within 1-2 weeks, while physically demanding work takes longer. Function-based criteria apply to sports; pure time information is only a rough guide.

• Everyday life: light activities after a few days, driving a car only when the vehicle is safely inspected
• Sport without arm contact (e.g. ergometer): often early, provided it is pain-free and stable
• Weight room: initially leg and core oriented, upper body training later and guided
• Contact and overhead sports: only after proven stability, strength and control

Differential diagnoses and related injuries

• Posterior shoulder dislocation: rare, including after electrical accidents or seizures
• Inferior shoulder dislocation (luxatio erecta): arm fixed in the overhead position
• AC joint sprain: injury to the acromioclavicular joint
• Proximal humerus fracture or bony Bankart fracture
• Rotator cuff tear (especially > 40 years)

A differentiated diagnosis is crucial, as therapy and follow-up treatment vary depending on the pattern of injury.

Your treatment in Hamburg

In our orthopedic practice at Dorotheenstrasse 48, 22301 Hamburg, you will receive a structured assessment and treatment tailored to you. We prioritize conservative options, closely monitor rehabilitation and objectively discuss surgical options if the indication is given.

• Appointments can be made quickly for acute complaints
• Cooperative physiotherapy planning with clear goals
• Modern imaging and standardized stability assessment
• Transparent information without promises of cure

Safe Exercises: Principles (upon release)

Specific exercises are dosed individually. Basic principles after approval by the practitioner: low pain, controlled, progressive.

• Scapular stability: serratus and trapezius activation
• Isometry of the rotator cuff in neutral joint positions
• Proprioceptive training (e.g. closed chain, unstable surfaces)
• Later: functional chains, sport-specific technology