A dislocated shoulder occurs when the humerus bone is displaced forwards out of the joint. Here we explain the symptoms, causes, and rehabilitation for shoulder dislocations.
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Dislocated shoulder symptoms
Symptoms of a shoulder dislocation include:
- Sudden severe pain will be felt at the time of injury.
- Your shoulder joint will swell up rapidly
- Bruising usually develops later.
- You may feel your shoulder has popped out of the joint.
The injured side will often look different or possibly lower than the uninjured side.
The patient may hold their arm close to their body and resist moving or turning it outwards.
If there is any nerve or blood vessel damage, you may also feel pins and needles or numbness.or discoloration through the arm to the hand.
If you suspect a dislocated shoulder, seek immediate medical attention. DO NOT attempt to put the joint back into place as long term damage can be caused.
What is a shoulder dislocation?
A dislocated shoulder occurs when the head of the humerus (upper arm) bone pops out of the shoulder joint.
They are usually either posterior or anterior dislocations:
Anterior shoulder dislocations
Most dislocated shoulders are anterior dislocations. They occur in approximately 95% of injuries.
The head of the humerus bone dislocates forwards, out of the front of the joint.
In particular, they occur when the arm is out to the side (abducted) and rotated outwards (externally rotated).
Most shoulder dislocations also cause tears to the glenoid labrum. This is a ring of cartilage which acts like a cup, in which the humerus bone rests. This is known as a Bankart lesion.
Anterior shoulder dislocatins are also associated with Axillary nerve injury, especially if there is any impaired sensation/numbness over the outside of the shoulder.
If you have dislocated your shoulder then you are likely to have damage to the surrounding ligaments, tendons, nerves, blood vessels and fractures to other bones.
Recurring injuries can be common which is why it is especially important to do sufficient shoulder rehabilitation.
Posterior shoulder dislocations
The head humerus dislocates out of the back of the joint.
Posterior dislocations account for around 3% of shoulder dislocations and can occur during epileptic seizures or when falling onto an outstretched hand.
- More on Posterior shoulder dislocation
Dislocated shoulder causes
Dislocated shoulders are usually caused by falling onto an outstretched arm, twisting your arm, or a direct impact to the shoulder.
The shoulder joint is particularly prone to injury due to the large range of movement available. The increased range of movement sacrifices joint stability. Therefore making the shoulder more susceptible to injury.
Immediate treatment for a dislocated shoulder has two stages. First protect your shoulder joint to prevent further damage and secondly seek medical attention as soon as possible.
Do not attempt to pop the shoulder back in yourself. Serious damage can occur to nerves and other blood vessels if it is done incorrectly.
Immediate First Aid
Stop play immediately and seek medical attention. It is likely you will not have a choice about this, as a dislocated shoulder is very painful.
A doctor will need to confirm your shoulder is dislocated and put it back into its socket. This is known as reduction.
Apply ice or cold therapy. Ice can be applied for 15 minutes every hour to help with the pain and swelling.
Specialist cold therapy shoulder wraps are particularly good as they apply both cold therapy and compression at the same time.
If a Doctor cannot perform a reduction immediately, they may apply a sling to take the weight off your arm.
Dislocated shoulder reduction
Reduction is the medical term used to describe relocating a dislocated bone back into the right position. The sooner your shoulder is reduced, the easier it will be to reduce it.
This can be done without surgery, called a closed reduction, or surgically, known as open reduction. The decision of whether to surgically reduce your shoulder may depend on any associated injuries, fractures and damage to your joint.
Reduction should always be followed up with a post-reduction X-Ray to check for any possible complications.
Your doctor may give you an injection of 10-15ml of xylocaine to reduce pain, muscle spasm and therefore aid reduction.
If surgery is indicated, it is usually performed as soon as possible after your injury.
Patients aged 15 to 25
In particular, evidence also suggests that young, active adults between the ages of 15 and 25 would benefit from surgical reduction for a first time anterior dislocation. The recurrence rate and quality of life outcomes appear to be better than for nonsurgical reduction.
Patients aged 25 to 40
Patients aged 25 to 40 may be recommended a period of conservative treatment first as recurrence rate is lower for older patients.
There are a number of procedures which can be performed. The decision over which procedure to use depends largely on the patient’s lifestyle and activity.
Some procedures result in reduced shoulder external rotation and so are not suitable for athletes involved in throwing or racket sports as this would affect performance.
Recurrent shoulder dislocations
Unfortunately, recurrent dislocations are frequent, especially in younger athletes. Often arthroscopic surgery is done to investigate the damage done and/or stabilize your joint.
If a Bankart lesion is found then this should be repaired. The chance of suffering another dislocated shoulder is reduced to less than 5% following surgical repair.
Treatment after reduction
Treatment following a closed reduction is often referred to as conservative treatment. It means non-surgical and usually involves a period of rest and immobilization in a sling or similar.
This is to allow the structures which may have been injured to have adequate time to heal.
Some surgeons will advocate immobilizing your shoulder in 30 degrees of external rotation. This is because using a traditional sling in internal rotation (across your front), can make a Bankart lesion worse.
Although it may be very inconvenient, immobilising at 30 degrees can reduce the chance of your injury recurring.
You may be prescribed NSAIDs such as ibuprofen to ease pain and inflammation.
Dislocated shoulder rehabilitation
Your shoulder will need extensive rehabilitation to regain mobility and strength.
Following a reduction, you will usually be advised to rest and immobilize your shoulder in a sling for 5-7 days, longer if there are fractures or severe soft tissue damage.
After the period of initial immobilization, exercises to gradually increase your range of pain-free movement are done.
Eventually isometric strengthening exercises, dynamic strengthening, proprioception and functional or sports related should be done.
- More on Dislocated shoulder exercises