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Key Takeaways
- A shoulder dislocation occurs when the upper arm bone (humerus) comes out of the shoulder socket, usually after a fall, sports injury or accident.
- It is a medical emergency that requires prompt treatment to reposition the shoulder and reduce the risk of nerve damage, recurring dislocations and long-term instability.
- Most people recover well with early treatment, rehabilitation and, in some cases, surgery if the shoulder remains unstable.
Your shoulder gives you the freedom to lift, throw and reach in almost every direction. But that flexibility also makes it the joint most likely to dislocate. Knowing the signs and getting prompt treatment can help reduce complications and support your recovery.
What is shoulder dislocation?
A shoulder dislocation happens when the head of your upper arm bone (humerus) is forced out of the shoulder socket (glenoid).
Your shoulder is the most mobile joint in your body, allowing you to lift, rotate and reach in many directions. This wide range of movement also makes it the joint most commonly affected by dislocations.
A dislocated shoulder usually occurs after significant force, such as a fall, sports injury or road traffic accident. When the shoulder dislocates, the ligaments, cartilage and surrounding muscles may also be stretched or torn.
A shoulder dislocation is different from a shoulder separation, which involves the ligaments connecting the collarbone to the shoulder blade rather than the shoulder joint itself.
Causes of shoulder dislocation
A shoulder dislocation can happen whenever a strong force pushes your arm beyond its normal range of movement.
Common causes include:
- Falling onto an outstretched hand
- Sports injuries (such as rugby, football, basketball, hockey or martial arts)
- Cycling or motorcycle accidents
- Motor vehicle collisions
- Direct impact to your shoulder
- Workplace accidents
- Seizures or electric shocks, which can cause sudden muscle contractions leading to dislocation
Your risk is higher if you:
- Have had a previous shoulder dislocation
- Participate in contact or overhead sports
- Have naturally loose joints (joint hypermobility)
- Have weak shoulder muscles
- Are younger, especially under 30 years old
Types of shoulder dislocation
Shoulder dislocations are classified based on the direction the upper arm bone moves out of the socket.
Anterior shoulder dislocation
This is the most common type, accounting for over 90% of shoulder dislocations.
The upper arm bone moves forward, often after:
- Falling onto an outstretched arm
- Throwing injuries
- Contact sports
Posterior shoulder dislocation
This is much less common.
It may occur after:
- Seizures
- Electric shocks
- Significant trauma
Posterior dislocations are sometimes harder to diagnose because the deformity is less obvious.
Inferior shoulder dislocation
Also called luxatio erecta, this rare injury occurs when the arm is forced upward above the head.
It usually results from high-energy trauma and often involves additional injuries.
Symptoms of shoulder dislocation
Symptoms usually develop immediately after the injury.
You may experience:
- Severe shoulder pain
- A visible shoulder deformity
- Your shoulder looking "out of place"
- Inability to move your arm normally
- Swelling
- Bruising
- Muscle spasms
- Weakness
- Numbness or tingling in your arm, hand or fingers
- A feeling that the shoulder has "popped out"
If you have severe pain after an injury or suspect a shoulder dislocation, seek emergency medical care immediately.
Speak with our Care Team today to be matched with an orthopaedic specialist who can assess your condition, explain your options, and help you plan the next steps in your treatment.
What should you do immediately after a shoulder dislocation?
Applying an ice pack to the shoulder may help reduce pain and swelling after a shoulder dislocation or acute shoulder injury.
A shoulder dislocation is a medical emergency. If you think your shoulder has dislocated, avoid trying to move it back into place yourself, as this can cause further injury.
Until you receive medical care:
- Keep your arm still and support it with a sling or against your body.
- Apply an ice pack wrapped in a towel for 15–20 minutes at a time to help reduce pain and swelling.
- Avoid eating or drinking if surgery or sedation may be needed.
- Do not attempt to reposition the shoulder yourself or let someone without medical training do it.
- Go to the nearest emergency department or seek urgent medical attention as soon as possible.
Prompt treatment helps reduce pain, restore shoulder function, and lower the risk of complications.
Diagnosis of shoulder dislocation
Your doctor will usually diagnose a shoulder dislocation through a physical examination and imaging tests.
Physical examination
Your doctor will ask how the injury happened and assess your symptoms.
They will examine your shoulder for:
- Deformity
- Swelling
- Tenderness
- Range of movement (only if appropriate)
- Shoulder stability
Your doctor may compare both shoulders to identify differences.
Because moving a dislocated shoulder can be extremely painful, the examination is usually gentle.
Imaging tests
Imaging helps confirm the diagnosis and identify associated injuries.
Your doctor may recommend:
X-ray
An X-ray is the first imaging test performed. It confirms:
- The direction of the dislocation
- Whether the shoulder has been successfully repositioned
- Any associated fractures
MRI
An MRI may be recommended if your doctor suspects injuries to:
- Ligaments
- Labrum
- Rotator cuff tendons
- Cartilage
MRI is particularly useful if your shoulder continues to feel unstable after treatment.
CT scan
A CT scan may be used if complex fractures or significant bone loss are suspected, particularly before surgery.
Neurological and vascular testing
Because shoulder dislocations can injure nearby nerves and blood vessels, your doctor will also check:
- Sensation in your arm and hand
- Muscle strength
- Pulse at your wrist
- Blood circulation
- Finger movement
These checks help identify injuries that require urgent treatment.
How are shoulder dislocations treated?
Treatment depends on your age, activity level, the severity of the injury and whether this is your first dislocation.
Closed reduction
The first step is usually closed reduction, where your doctor gently guides the upper arm bone back into the shoulder socket.
This should only be performed by a trained healthcare professional.
You may receive:
- Pain relief medication
- Sedation
- Muscle relaxants
Once the shoulder is back in place, your pain usually improves significantly.
Immobilisation
After reduction, you may need to wear a sling for several days or weeks to allow healing.
The duration depends on:
- Your age
- The severity of the injury
- Associated injuries
Medications
Your doctor may recommend medications to reduce significant pain and inflammation.
Physiotherapy
Physical therapy is an important part of recovery.
Your rehabilitation programme may include exercises to:
- Restore shoulder movement
- Strengthen the rotator cuff
- Improve shoulder stability
- Reduce the risk of future dislocations
- Help you safely return to sports or work
A physiotherapist guides shoulder exercises to restore strength, flexibility and range of motion after a shoulder dislocation.
Surgery
Surgery may be recommended if:
- You have repeated shoulder dislocations
- Your shoulder remains unstable
- You have significant ligament or labral tears
- You have fractures requiring repair
- You are a young athlete involved in contact sports
The goal is to repair damaged structures and restore shoulder stability.
Shoulder dislocation recovery timeline
Recovery varies depending on the severity of the injury, associated damage, and whether surgery is required. Following your rehabilitation programme is important for regaining strength and reducing the risk of another dislocation.
Note: Recovery times vary from person to person. Your orthopaedic specialist or physiotherapist will advise when it is safe to return to work, driving, or sports.
Can a shoulder dislocation happen again?
Yes. Once you've had a shoulder dislocation, you have a higher risk of experiencing another one, particularly if the ligaments or cartilage were damaged during the initial injury.
The risk of recurrent dislocation is higher if you:
- Are younger, especially under 30 years of age
- Participate in contact or overhead sports
- Return to sports before completing rehabilitation
- Have significant ligament, labrum, or bone injuries
- Have naturally loose joints (joint hypermobility)
Completing your physiotherapy programme, strengthening the muscles around the shoulder, and following your doctor's advice before returning to sports can help reduce the risk of another dislocation. If the shoulder continues to dislocate or feels unstable, surgery may be recommended to restore stability.
How to prevent shoulder dislocation?
Although not all shoulder dislocations can be prevented, you can reduce your risk by:
- Strengthening your shoulder and rotator cuff muscles
- Completing your physiotherapy programme after an injury
- Warming up before exercise
- Using proper sports techniques
- Wearing appropriate protective equipment during contact sports
- Avoiding activities that place excessive strain on an injured shoulder until you have fully recovered
If you've had a previous shoulder dislocation, following your rehabilitation plan is especially important to reduce the risk of another injury.
Complications of shoulder dislocation
Most people recover well after treatment, but complications can occur.
Recurring dislocations
Once you've had one shoulder dislocation, you're more likely to experience another, particularly if you're young or participate in contact sports.
Nerve and blood vessel damage
The injury may stretch or compress nearby nerves and blood vessels.
This can lead to:
- Numbness
- Weakness
- Reduced sensation
- Poor circulation
Although uncommon, these injuries require prompt medical attention.
Rotator cuff tears
Older adults are more likely to develop rotator cuff tears during a shoulder dislocation.
This can result in persistent pain and weakness.
Chronic shoulder instability
Some people continue to feel that the shoulder is loose or may "slip out" during everyday activities.
Persistent instability may require surgery.
Arthritis
Repeated dislocations and cartilage damage can increase your risk of developing shoulder osteoarthritis later in life.
Labral tears (Bankart lesion)
A Bankart lesion occurs when the cartilage (labrum) at the front of the shoulder socket tears.
This injury is a common cause of recurrent shoulder instability.
Hill-Sachs lesion
A Hill-Sachs lesion is a dent or compression fracture in the head of the upper arm bone that occurs when it strikes the edge of the shoulder socket during a dislocation.
Large Hill-Sachs lesions increase the likelihood of future dislocations.
When should you see an orthopaedic specialist?
You should see an orthopaedic specialist if you:
- Think your shoulder is dislocated
- Have severe shoulder pain after an injury
- Cannot move your arm normally
- Notice your shoulder looks deformed
- Have numbness, tingling or weakness in your arm or hand
- Experience repeated shoulder dislocations
- Continue to have shoulder instability after treatment
- Have persistent pain or limited movement after your injury
Seek emergency medical attention immediately if you suspect a shoulder dislocation.
How HiA helps
If you've injured your shoulder or have ongoing shoulder instability, Health in Asia (HiA) makes it easier to connect with experienced orthopaedic specialists in Singapore.
Whether you need an urgent assessment, a second opinion, imaging such as an X-ray or MRI, or advice on treatment options, HiA can help you find and book appointments with the right specialist.
Not sure whether your shoulder injury needs medical attention? Talk to our Care Team on WhatsApp – we'll help you understand your options and connect you with an appropriate healthcare provider.
Frequently asked questions
You may still be able to move your arm slightly, but movement is usually very painful and limited. Most people find it difficult or impossible to lift the affected arm, and the shoulder may appear visibly out of place.
No. A dislocated shoulder does not usually go back into the correct position on its own. It needs prompt medical treatment to reposition the joint safely. Delaying treatment can increase the risk of complications such as nerve injury, recurrent dislocations and long-term shoulder instability.
Yes. Send us what you have. If anything's missing, we'll tell you exactly what to request and how.
Usually, no. If it’s urgent, act on the first doctor’s advice right away. If it’s not urgent, taking a little time to check can save you from going the wrong way.
Yes, where the specialist offers it and your case suits it. We'll flag which of your options can start remotely.
Disclaimer
This article and its contents are provided for educational and informational purposes only and do not constitute medical advice or professional services specific to you or your medical condition. For decisions about your health or treatment, speak with a qualified doctor who knows your situation. An…
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