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Arm weakness that persists after an accident, fall, or neck or shoulder injury may indicate nerve damage rather than a problem with the muscles or joints alone. A brachial plexus injury can cause numbness, pain, and difficulty moving the arm because these nerves carry signals between the spinal cord and the shoulder, arm, and hand. How well the arm recovers depends largely on where the nerves are injured and how severe the damage is.
How Brachial Plexus Injury Affects Arm Function
The brachial plexus connects the spinal cord with the nerves that control movement and sensation in the shoulder, arm, and hand. An injury to this nerve network may make it difficult to lift the arm, bend the elbow, move the wrist, or grip objects. It can also cause pain, numbness, or changes in sensation.
The effects depend on how badly the nerves are damaged. A stretched or compressed nerve may still recover, whereas a torn nerve or one pulled away from the spinal cord can cause more severe and lasting problems with movement and sensation.
How the Location of Nerve Damage Affects Symptoms
Brachial plexus injury symptoms can range from mild changes in sensation to significant loss of arm function. Common symptoms include:
- Arm weakness: Difficulty lifting the arm, bending the elbow, moving the wrist, or gripping objects.
- Numbness or tingling: Reduced or altered sensation in the shoulder, arm, forearm, hand, or fingers.
- Nerve pain: Burning, shooting, or electric-like pain that may travel through the shoulder, arm, or hand.
- Reduced coordination: Difficulty performing movements that require precise control of the hand or fingers.
- Partial or complete loss of movement: Severe nerve injuries may cause significant weakness or paralysis in part of the arm.
The movements and areas of sensation affected often depend on where the nerve damage occurs.
Upper Brachial Plexus Injury
Damage to the upper brachial plexus often affects the nerves that control the shoulder and upper arm. When the upper trunk, which mainly arises from the C5–C6 nerve roots, is involved, patients may have difficulty lifting or rotating the arm and bending the elbow. Hand function may remain relatively preserved.
Lower Brachial Plexus Injury
Lower plexus injuries often affect the forearm, wrist, and hand. When the lower trunk, which mainly arises from the C8–T1 nerve roots, is involved, grip strength may decrease, finger movements may become less precise, and sensation in the forearm or hand may change.
Types of Brachial Plexus Injuries
The type of brachial plexus injury reflects what has happened to the nerve itself. A stretch leaves the nerve intact, a rupture tears it, and an avulsion separates the nerve root from the spinal cord. These differences affect both the chance of nerve recovery and the treatment that may be needed.
Brachial Plexus Stretch Injury
Stretching beyond the nerve’s normal range can interfere with signals traveling to the arm without completely tearing the nerve. Weakness, numbness, tingling, or reduced movement may follow. Some stretch injuries gradually recover, although the time needed depends on how severely the nerve was affected.
Brachial Plexus Nerve Rupture
When part of the nerve tears, signals to the arm may not travel normally. Depending on where the damage occurs, patients may notice weakness, numbness, or difficulty moving part of the arm. More severe tears may need nerve reconstruction if the nerve is unlikely to heal on its own.
Brachial Plexus Avulsion Injury
Avulsion occurs when a nerve root pulls away from the spinal cord and is the most severe form of brachial plexus injury. Because the nerve root is no longer connected to the spinal cord, it cannot heal in the same way as a stretch or rupture injury. Surgeons may use techniques such as nerve transfer to help restore selected arm movements.
Common Causes of Brachial Plexus Injury
Most traumatic cases occur when a strong force pulls the neck and shoulder in opposite directions or places sudden pressure on the nerves.
Common causes of brachial plexus injury include:
- Motorcycle and vehicle accidents: High-energy collisions can stretch or tear nerves around the neck and shoulder.
- Sports injuries: Contact sports and high-impact activities can suddenly stretch or compress the nerves around the neck and shoulder.
- Falls: Landing heavily on the shoulder or neck can stretch or compress the nerves.
- Deep cuts or wounds: Serious cuts around the neck or shoulder can directly injure the brachial plexus.
- Birth-related injuries: Difficult delivery, especially when the baby’s shoulder gets stuck during childbirth, can stretch the brachial plexus and cause brachial plexus palsy.
The pattern and severity of nerve damage can differ even after similar types of trauma. Persistent weakness or loss of sensation after an injury may therefore need further evaluation to determine which nerves are affected.
How Doctors Diagnose a Brachial Plexus Injury
Arm weakness alone does not show the full extent of a brachial plexus injury. The distribution of weakness, numbness, and changes in reflexes can point to the part of the nerve network that has been damaged. Doctors combine these findings with MRI, EMG, and nerve conduction studies to define the extent of the injury and assess how much nerve function remains.
Physical examination
Shoulder and elbow weakness may appear even when wrist and hand function remain normal. In other cases, weakness extends farther down the arm. Doctors examine these differences together with reflexes and sensation to work out where the nerve injury is located.
Magnetic resonance imaging (MRI)
MRI for a brachial plexus injury provides detailed images of the nerve network and surrounding tissues. Doctors may use it to identify nerve damage, swelling, scarring, or other changes that could explain the symptoms and help guide treatment planning.
Electromyography (EMG) and nerve conduction studies
Electromyography (EMG) and nerve conduction studies assess how well nerves and muscles function after an injury. These tests can help identify the affected nerves, measure the extent of nerve damage, and track whether nerve function begins to return over time.
X-ray or CT myelography
X-rays may help detect fractures or other bone injuries around the neck and shoulder. In more severe cases, CT myelography can give doctors a closer look at possible nerve root damage near the spinal cord, including avulsion injuries.
Brachial Plexus Injury Treatment Options
Treatment planning for a brachial plexus injury focuses on the extent of nerve damage and the function that remains in the affected arm. Signs of nerve recovery, the location of the injury, and the time since trauma all help determine whether rehabilitation is appropriate or whether surgical reconstruction may offer greater benefit.
Rehabilitation and Nonsurgical Treatment
A stretched or compressed nerve may recover without surgery. During this period, rehabilitation keeps the arm moving, limits joint stiffness, and maintains the remaining muscle activity. Changes in strength, sensation, and movement over time show how well the nerve is recovering.
Physical rehabilitation may include:
- Maintaining movement in the shoulder, elbow, wrist, and hand
- Preventing joint stiffness and muscle shortening
- Strengthening muscles that still function
- Supporting hand coordination and daily activities
- Managing pain and changes in sensation
- Monitoring returning nerve and muscle function
Because nerves recover slowly, doctors may track changes in strength, sensation, muscle activity, and EMG findings over several months.
Brachial Plexus Surgery
Severe nerve damage can leave the arm with limited movement even after a period of recovery and rehabilitation. In these cases, surgery may help restore nerve signals to muscles that no longer receive normal nerve input. For brachial plexus nerve surgery, surgeons consider which nerves are damaged, how much function remains, and how much time has passed since the injury.
Nerve Repair
For a clean tear with little nerve tissue loss, surgeons may bring the two nerve ends back together directly. They do not need a graft in this situation, and new nerve fibers can grow across the repaired area toward the muscles.
Nerve Grafting
If the injury damages a section of the nerve, the two healthy ends may be too far apart to reconnect directly. Surgeons can bridge this gap with a healthy nerve segment taken from another part of the body. New nerve fibers then grow through the graft toward the muscles they need to reach.
Nerve Transfer
Major damage can make the original nerve pathway unusable. Surgeons can then use a nearby working nerve branch and connect it to the nerve that controls the weakened muscle. This gives nerve signals a shorter route to reach the muscle and may help restore movements such as lifting the shoulder or bending the elbow.
Why Timing Matters After a Brachial Plexus Injury
Time can affect the recovery potential of both the injured nerves and the muscles they control. If muscles go without normal nerve signals for too long, their ability to regain function may gradually decline, which can also limit the results of later nerve reconstruction.
Timing often guides the next step in treatment:
- First few months: Doctors monitor strength, sensation, and nerve function for signs of recovery.
- Around 3–6 months: Nerve reconstruction may be considered when the nerves show little sign of meaningful recovery.
- Within 1 year: Treatment should generally not be delayed beyond this period, as prolonged loss of nerve supply can reduce the likelihood of restoring useful muscle function.
Early specialist evaluation helps doctors determine whether the nerves are recovering as expected or whether surgery should be considered within the appropriate treatment window.
What Affects Recovery After a Brachial Plexus Injury
Recovery after a brachial plexus injury can take several months or longer because damaged nerves need time to regrow toward the muscles they innervate. The extent of nerve damage, where the injury occurs, and how early treatment begins can all affect how much function returns over time.
Factors that can influence recovery include:
- Type and severity of nerve damage
- Location of the injury
- Time between injury and treatment
- Distance the nerve must regenerate to reach the affected muscles
- Surgical treatment, when needed
- Progress during rehabilitation
Regular follow-up helps doctors monitor changes in strength, sensation, and muscle activity as recovery progresses. Rehabilitation also helps maintain joint movement, reduce stiffness, and support the return of useful arm function.
At Neuroscience Center at Vejthani International Hospital, specialists evaluate complex brachial plexus injuries through neurological assessment, imaging, nerve function testing, rehabilitation, and surgical treatment when needed. The goal is to accurately identify the injury, plan treatment within the appropriate timeframe, and help patients regain meaningful use of the affected arm.
FAQ
What are the symptoms of brachial plexus injury?
Brachial plexus injury symptoms vary with the location and extent of nerve damage. Patients may experience arm weakness, numbness or tingling, pain, or difficulty moving the shoulder, arm, or hand. Everyday tasks such as lifting the arm or gripping objects can also become difficult.
Can brachial plexus injury occur in newborns?
A brachial plexus injury can occur during childbirth, particularly when the baby’s shoulder becomes stuck during delivery. Nerve stretching may affect movement and sensation in the arm. Early evaluation helps determine whether the baby needs monitoring, rehabilitation, or further treatment.
What are the treatment options for brachial plexus injury?
Treatment may range from rehabilitation and close monitoring to surgery, depending on how severely the nerves are damaged and whether they show signs of recovery. Surgical options can include nerve repair, nerve grafting, nerve transfer, and, in selected cases, tendon or muscle transfer to improve arm function.
How long does recovery from brachial plexus injury take?
Brachial plexus injury recovery time can range from several months to longer, especially when the nerve damage is extensive. Recovery is influenced by the location and severity of the injury, how early treatment begins, whether surgery is needed, and progress during rehabilitation.
When Brachial Plexus Surgery May Be Needed
Surgery may become necessary when a nerve has ruptured or pulled away from the spinal cord, or when arm function shows little improvement over time. The decision also depends on which nerves are damaged, how much movement remains, and how long it has been since the injury. Early assessment is important because nerve reconstruction generally offers better potential for recovery when performed within the appropriate treatment window.
For more information, please contact
Neuroscience Center, Vejthani International Hospital
Call: (+66)2-734-0000 Ext. 5400
English Hotline: (+66)85-223-8888
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