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Dr Seng Chusheng
Dr Seng Chusheng Consultant Orthopaedic Surgeon MBBS (Singapore), MRCS (Edinburgh), MMed (Orth), FRCS (Edinburgh)
Shoulder Dislocation: Causes, Treatment, and Prevention

The first thing many people notice is not always the pain, but how unfamiliar the shoulder feels afterwards. Even once it has been put back in place, there can be a lingering sense that something is not quite right. Movements that used to be automatic, such as reaching overhead, pushing up from a chair or turning in bed, may start to feel deliberate or uncertain. For some, this settles over time. For others, the shoulder does not fully regain its sense of stability, especially in certain positions. This can make everyday activities feel less predictable and may raise concerns about whether the joint could slip out again. That uncertainty is often what brings people to seek further evaluation.

What Is a Shoulder Dislocation?

A shoulder dislocation occurs when the upper arm bone (humeral head) is forced out of its normal position in the shoulder joint. The shoulder is a ball-and-socket joint, where the rounded head of the humerus fits into a shallow socket called the glenoid.
When excessive force is applied, such as during a fall or impact, the humeral head can slip out of the glenoid socket, causing pain, instability and limited movement.

Types of Shoulder Dislocation

Shoulder dislocations can be classified based on the direction in which the upper arm bone moves out of the socket. Understanding the different types can help determine the severity of the sports injury and guide appropriate treatment.
Anterior Dislocation

Anterior Dislocation

This is the most common type of shoulder dislocation, where the humeral head moves forward out of the glenoid socket. It often occurs due to a fall onto an outstretched arm or a direct blow to the shoulder, leading to pain and visible deformity.

Posterior Dislocation

Posterior Dislocation

In this less common type, the humeral head is pushed backward out of the socket. It may occur due to high-impact injuries, seizures, or electrical shocks, and can sometimes be harder to detect initially.

Inferior Dislocation

Inferior Dislocation

Also known as luxatio erecta, this is a rare type where the humeral head moves downward out of the socket. It is usually associated with significant trauma and may result in the arm being stuck in an overhead position.

Shoulder Subluxation (Partial Dislocation)

Shoulder Subluxation (Partial Dislocation)

A subluxation occurs when the humeral head partially slips out of the socket but returns to its normal position on its own. Although less severe than a full dislocation, it can still cause pain, instability, and an increased risk of future dislocations.

If you have experienced a shoulder dislocation or ongoing instability, Dr Seng Chusheng manages a full range of cases, from first-time injuries to recurrent dislocations.

What Causes Shoulder Dislocations?

Shoulder dislocations occur when forces applied to the joint exceed what the surrounding structures can stabilise. Because the shoulder is designed for a wide range of movement, it is inherently less stable than other joints and more susceptible to being displaced.
Common causes of shoulder dislocations include:
  • Trauma or Falls

    A fall onto the shoulder or an outstretched arm is one of the most common causes. The impact can drive the humeral head out of the socket, particularly during accidents or sudden slips.
  • Sports Injuries

    Contact sports and activities involving rapid changes in direction or overhead movement, such as football or basketball, increase the risk. Dislocations often occur during collisions or when the arm is forced into an awkward position.
  • Forceful or Uncontrolled Movements

    Sudden movements, especially when the arm is extended or rotated, can place significant stress on the joint and lead to dislocation even without direct impact.
  • Previous Shoulder Dislocation

    A prior dislocation can stretch or damage the ligaments and soft tissues that stabilise the joint. This makes the shoulder more prone to slipping out again, sometimes with less force than the initial injury.
  • Weak or Unstable Shoulder Muscles

    The muscles around the shoulder play an important role in keeping the joint stable. Weakness, fatigue or poor coordination can reduce this support and increase the risk of injury.
  • Underlying Joint Laxity

    Some individuals naturally have more flexible or looser ligaments. This can make the shoulder joint less stable and more likely to dislocate.

How Is Shoulder Dislocation Diagnosed?

Diagnosing a shoulder dislocation involves a combination of clinical assessment and imaging to confirm the injury and evaluate any associated damage.
  • Clinical Assessment

    The doctor will assess the shoulder for visible changes in shape, swelling and areas of tenderness. Movement is checked carefully, as certain positions may be painful or restricted. Sensation and strength in the arm may also be evaluated to rule out nerve involvement.

    You will also be asked about how the injury occurred, including the position of the arm and the force involved. A history of previous dislocations is important, as it can increase the risk of recurrence and affect management.
  • X-Rays

    X-rays are typically the first imaging test used. They confirm whether the shoulder is dislocated and help identify any associated fractures. X-rays are often taken both before and after the joint is put back into place.
  • MRI Scans

    An MRI may be recommended to assess damage to soft tissues, such as ligaments, tendons and cartilage. This is particularly useful if there is concern about ongoing instability or injury to structures that support the joint.
  • CT Scans

    CT scans provide more detailed images of the bones and may be used if a complex fracture is suspected or if further evaluation of the joint structure is needed.

Shoulder Dislocation Treatment Options

Treatment for a shoulder dislocation focuses on returning the joint to its normal position, managing pain and restoring stability. The approach depends on the severity of the injury and whether it is a first-time or recurrent dislocation.

Non-Surgical Option

Many first-time dislocations can be managed without surgery. The initial step is usually a closed reduction, where the humeral head is gently guided back into the socket.discomfort. Physiotherapy is an important part of recovery, helping to strengthen the surrounding muscles and restore stability to the joint. After the joint has been repositioned, the shoulder may be supported in a sling for a short period to allow the surrounding tissues to heal. Pain relief is often prescribed during this phase. Rehabilitation through physiotherapy plays a key role in recovery, focusing on strengthening the muscles around the shoulder and improving joint stability.

Surgical Options

Surgery may be considered if the shoulder continues to feel unstable, if dislocations recur, or if there is significant damage to the bones or soft tissues. The aim is to restore stability and reduce the likelihood of future dislocations. Common procedures include:
  • Ligament Repair

    Repairing or tightening stretched ligaments to improve support around the joint.
  • Labrum Repair

    Reattaching or repairing the labrum, the cartilage rim that helps keep the humeral head centred within the socket.
  • Bone Reconstruction

    Restoring or reshaping areas of bone loss in the shoulder to improve joint alignment and stability.

For a personalised treatment plan, Dr Seng Chusheng manages shoulder dislocations with both non-surgical care and advanced surgical techniques when needed.

Shoulder Dislocation Management & Rehabilitation

Recovery from a shoulder dislocation typically involves a structured rehabilitation programme aimed at restoring strength, stability and confidence in movement. Progress is gradual and guided by how the shoulder responds at each stage.

Early Stage

In the initial phase, the focus is on allowing the shoulder to settle while preventing stiffness. Gentle, controlled movements may be introduced alongside the use of a sling for support. Pain and swelling are managed during this period to allow the surrounding tissues to begin healing.

Physiotherapy and Strengthening

As symptoms improve, rehabilitation shifts towards strengthening the muscles that support the shoulder, particularly the rotator cuff. These exercises help improve joint control and reduce the risk of further instability.

Mobility and Functional Training

Once strength begins to return, the emphasis moves to restoring range of motion and coordination. Exercises become more functional, gradually reintroducing movements used in daily activities or sports.

Return to Activity and Maintenance

A gradual return to normal activities is guided by strength and stability. Ongoing exercises are often recommended to maintain shoulder function and reduce the risk of recurrence, especially for those returning to higher-demand activities.

How to Prevent Shoulder Dislocation?

While not all shoulder dislocations can be avoided, certain measures can help reduce the risk and improve long-term shoulder stability.
  • Strengthen Shoulder Muscles

    Strengthening the rotator cuff and surrounding muscles plays a key role in supporting the shoulder joint. A well-conditioned shoulder is better able to withstand sudden or awkward movements.
  • Maintain Good Shoulder Mobility

    Regular stretching helps preserve flexibility and allows the joint to move through its full range without strain. This supports more controlled and efficient movement patterns.
  • Use Proper Technique

    Whether during sports or daily activities, good form reduces unnecessary stress on the shoulder. This is particularly important for overhead or repetitive movements.
  • Prepare Before Activity

    Warming up before exercise helps activate the muscles and improves joint readiness, lowering the risk of injury.
  • Progress Activity Gradually

    Sudden increases in intensity or load can place excessive strain on the shoulder. Building up gradually allows the joint and surrounding structures to adapt.
  • Protect the Shoulder When Needed

    In contact sports or higher-risk activities, protective support or bracing may provide additional stability.
  • Address Previous Injuries Properly

    Incomplete rehabilitation after a dislocation increases the risk of recurrence. Following through with strengthening and recovery is essential.
  • Be Aware of Vulnerable Positions

    Certain arm positions place the shoulder at higher risk, particularly in individuals with a history of instability. Being mindful of these movements can help prevent re-injury.

Getting the Right Care for a Shoulder Dislocation

A shoulder dislocation can range from a one-off injury to a recurring issue that affects stability and confidence in movement. Early assessment and appropriate management are important not only for recovery, but also for reducing the risk of future dislocations. The right approach depends on the severity of the injury, the degree of instability and the individual's activity level.
At Axis Sports Injury Clinic, care is guided by a structured approach to diagnosis, treatment and rehabilitation, with the aim of restoring long-term shoulder stability. Dr Seng Chusheng manages shoulder dislocations across all levels of severity and provides treatment plans tailored to each patient's condition and recovery goals. If your shoulder does not feel quite right after a dislocation, schedule a consultation early to address the issue and reduce the risk of further injury.

FAQs About Shoulder Dislocation

How long does shoulder dislocation surgery take?

Is it possible for a shoulder to dislocate again after surgery?

What happens if a dislocation is not treated immediately?

Will insurance cover surgery for shoulder dislocation?

Portrait of Dr Seng Chusheng, Consultant Orthopaedic Surgeon

Dr Seng Chusheng

Consultant Orthopaedic Surgeon

MBBS (Singapore), MRCS (Edinburgh), MMed (Orth), FRCS (Edinburgh)

Dr Seng Chusheng is an experienced orthopaedic surgeon with over 10 years of clinical practice and more than a thousand surgeries performed. He specialises in sports surgery, with particular expertise in managing shoulder dislocations and sports-related injuries, helping patients return safely to activity.

He is also a Fellow of the Royal College of Surgeons of Edinburgh (Orthopaedic Surgery), and was recognised for his dedication to patient care with the SingHealth Service With A Heart Award during his time as a consultant orthopaedic surgeon at Singapore General Hospital.

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