Sometimes a shoulder dislocation and nerve damage occur together, which can significantly affect recovery and function. Recognising and managing the nerve injury is crucial for a full recovery. So how do you know if a shoulder dislocation has damaged a nerve, and what should you do?
What is a shoulder dislocation?
A shoulder dislocation occurs when the upper arm bone (humerus) is forced out of its socket in the shoulder blade (glenoid). It often happens during contact sports, falls, or forceful overhead movements.
The most common type is an anterior dislocation, where the humeral head moves forward. Posterior dislocations are less frequent, but occur after seizures, electric shocks, or a fall onto an outstretched hand. When the shoulder dislocates, the surrounding muscles, tendons, ligaments, and nerves can all be stretched or torn.
Which nerve is damaged in a shoulder dislocation?
The nerve most at risk is the axillary nerve, which supplies the deltoid and teres minor muscles and provides sensation to the outer shoulder. It’s the most commonly injured nerve in a shoulder dislocation.
Less commonly, the dislocation stretches other nerves of the brachial plexus, or — in a more severe injury — several nerves at once. The risk of nerve injury rises with age and is higher when the dislocation comes with a fracture.
Signs of nerve damage after a shoulder dislocation
In the acute setting, the shoulder deformity and pain dominate. Once the shoulder is reduced (put back into place), a careful nerve assessment becomes essential. Your clinician checks:
- Sensation over the “regimental badge” area (the outer shoulder), which reflects axillary nerve function — and sensation in the forearm and hand for the other nerves
- Muscle strength — lifting the arm away from the body, and elbow and hand movements
- The neck and shoulder, to exclude other causes of reduced movement
Nerve-related burning pain (neuropathic pain) may be present, and points to a more severe injury. Other complications to look for include a humerus fracture, a rotator cuff tear, and nerve-root damage in the neck — all of which can cause weakness, wasting, and altered sensation.
When to seek urgent help. A shoulder that looks deformed after an injury needs prompt medical assessment to be put back into place. After reduction, see a doctor quickly if you have weakness lifting the arm, numbness over the outer shoulder, or burning nerve pain — these suggest nerve involvement and should be assessed early.
How is the nerve damage diagnosed?
The diagnosis starts with the clinical examination — testing the deltoid and the sensation over the outer shoulder. Weakness of shoulder abduction with numbness in the regimental-badge area is the classic sign of an axillary nerve injury.
Ultrasound and MRI assess the nerve, the rotator cuff, and the other structures. Nerve conduction studies and EMG confirm the extent and site of nerve damage, and are usually performed a few weeks after the injury, once the changes have had time to appear.
Treatment and recovery
The good news is that most nerve injuries after a shoulder dislocation recover on their own.
Early management focuses on protecting the shoulder and keeping it moving. A sling provides comfort in the early days, and physiotherapy begins early to maintain range of motion and prevent stiffness while the nerve recovers. As the nerve heals, strengthening of the deltoid and rotator cuff follows. For neuropathic pain, medications such as amitriptyline can help.
We monitor recovery clinically, repeating nerve studies where needed. Most axillary nerve injuries recover over weeks to months. Where there’s no recovery after several months, or a complete nerve rupture is suspected, we refer for a surgical opinion — occasionally, nerve repair or grafting is needed.
Frequently asked questions about shoulder dislocation and nerve damage
How do I know if I’ve damaged a nerve in a shoulder dislocation?
The commonest sign is weakness lifting the arm out to the side, together with numbness over the outer shoulder (the regimental-badge area) — this points to an axillary nerve injury. Burning or electric-shock pain also suggests nerve involvement. Any of these after a dislocation should be assessed.
Will the nerve recover on its own?
Usually, yes. Most axillary nerve injuries after a shoulder dislocation recover over weeks to months with a sling for comfort and early physiotherapy. Nerve studies help track recovery, and surgery is only considered if there’s no improvement after several months.
How long does recovery take?
It varies with the severity. Milder injuries recover over a few weeks, while more significant ones take several months. Physiotherapy throughout is important to keep the shoulder mobile and strong while the nerve heals.
Can a shoulder dislocation cause permanent nerve damage?
It’s uncommon, but possible with a severe injury — particularly a complete nerve rupture or an avulsion. This is why early assessment and monitoring matter: recognising a nerve injury that isn’t recovering allows timely referral for a surgical opinion.
Is nerve damage more likely with a fracture or in older people?
Yes. The risk of nerve injury rises with age, and a dislocation accompanied by a fracture roughly doubles the risk. Older people also more often tear the rotator cuff at the same time, which can complicate the picture — so a careful assessment is especially important.
Final word from Sport Doctor London about shoulder dislocation and nerve damage
Nerve damage is an important complication of a shoulder dislocation, most often affecting the axillary nerve. Recognising it early — through the tell-tale weakness and outer-shoulder numbness — and starting the right rehabilitation gives the best chance of full recovery. Most nerve injuries recover with time, but the ones that don’t need timely specialist assessment.
If you’ve dislocated your shoulder and have weakness, numbness, or nerve pain, Dr Masci can assess you in London, including ultrasound in clinic. Contact the team here or call +44 (0) 203 488 0350.
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