Radial Nerve Palsy: Causes, Symptoms, Diagnosis & Treatment- By Dr. Balaraju Naidu, Robotic Orthopedic Surgeon, ONUS Robotic Hospitals
Radial Nerve Palsy is a nerve-related condition that affects the function of the wrist, hand, and fingers. It usually happens when the radial nerve is injured, compressed, stretched, or damaged. One of the most common signs of radial nerve palsy is wrist drop, where the patient finds it difficult to lift the wrist upward.
The radial nerve controls important muscles that help extend the wrist, fingers, and thumb. It also provides sensation to parts of the back of the hand and forearm. When this nerve is affected, patients may experience weakness, numbness, tingling, reduced grip strength, and difficulty using the hand for daily activities. Radial nerve injury is commonly linked to trauma, humerus fractures, compression, and prolonged pressure on the arm.
What Is Radial Nerve Palsy?
Radial Nerve Palsy occurs when the radial nerve does not function properly due to injury or compression. This can interrupt signals from the brain to the muscles of the wrist and fingers, causing weakness or loss of movement.
The condition may be temporary in some cases, especially when caused by mild compression. However, if the nerve is severely injured, cut, trapped, or damaged after a fracture, recovery may take longer and may require advanced treatment.
What Is Wrist Drop?
Wrist drop is the classic symptom of radial nerve palsy. In this condition, the patient is unable to extend or lift the wrist and fingers properly. The hand may hang downward when the arm is stretched forward.
This can make simple activities difficult, such as:
Holding a glass
Writing or typing
Lifting objects
Opening doors
Using a mobile phone
Buttoning clothes
Gripping tools
Driving or riding a bike
Wrist drop happens because the muscles responsible for lifting the wrist and fingers are not receiving proper nerve signals.
Common Causes of Radial Nerve Palsy
1. Humerus Fracture
The radial nerve runs close to the humerus bone in the upper arm. Because of this close relationship, a fracture of the humerus can injure or stretch the radial nerve. Patients may develop wrist drop after an accident, fall, or fracture.
2. Prolonged Pressure on the Arm
Sleeping in an abnormal position, prolonged pressure over the arm, or compression of the nerve can cause temporary radial nerve palsy. This is sometimes seen when the arm is compressed for a long time.
3. Injury or Trauma
Road traffic accidents, sports injuries, falls, cuts, or penetrating injuries can damage the radial nerve. Depending on the severity, the nerve may be bruised, stretched, compressed, or completely injured.
4. Tight Casts or Bandages
A tight plaster cast, splint, or compression dressing can press on the radial nerve and cause symptoms. Any new numbness, tingling, severe pain, or weakness after applying a cast should be reported immediately.
5. Elbow Injuries or Dislocations
Injuries around the elbow, fractures, or dislocations can affect branches of the radial nerve and lead to weakness in the fingers or wrist.
6. Nerve Compression Around the Forearm
Radial nerve entrapment can occur at different locations along the nerve pathway. Compression near the elbow or forearm may cause pain, weakness, or difficulty extending the fingers. Entrapment near the supinator muscle and posterior interosseous nerve is a recognized cause of radial nerve-related symptoms.
7. Surgical or Post-Fracture Complications
Sometimes, radial nerve palsy may be seen after fracture fixation, trauma surgery, or swelling around an injury site. Proper assessment is important to understand whether the nerve is recovering naturally or needs further intervention.
Common Symptoms of Radial Nerve Palsy
Patients with radial nerve palsy may experience:
Wrist drop
Weak grip strength
Difficulty lifting the wrist
Difficulty lifting fingers or thumb
Numbness on the back of the hand
Tingling sensation
Weakness after fracture or injury
Pain around the arm, elbow, or forearm
Difficulty holding objects
Reduced hand control
Fatigue while using the hand
The exact symptoms depend on where the radial nerve is affected. A higher-level injury may affect the wrist, fingers, and sensation more significantly, while lower-level nerve involvement may mainly affect finger extension.
Warning Signs You Should Not Ignore
Consult an orthopedic specialist if you notice:
Sudden wrist drop
Hand weakness after injury or fracture
Numbness or tingling after trauma
Difficulty lifting fingers
Loss of grip strength
Weakness after a plaster cast or tight bandage
Pain with progressive weakness
No improvement in hand function over time
Early diagnosis helps identify the severity of nerve injury and improves the chances of recovery.
How Is Radial Nerve Palsy Diagnosed?
Diagnosis begins with a detailed clinical examination. The doctor checks wrist movement, finger extension, thumb movement, grip strength, sensation, reflexes, and the site of injury.
Depending on the cause, the doctor may recommend:
X-ray to check for fracture or bone injury
MRI or ultrasound in selected cases
Nerve conduction study
EMG test to assess nerve and muscle function
Clinical follow-up to monitor nerve recovery
Nerve conduction studies and EMG are useful in identifying the location and severity of nerve involvement and monitoring recovery.
Treatment Options for Radial Nerve Palsy
Treatment depends on the cause, severity, duration, and type of nerve injury.
1. Wrist Splinting
A wrist splint helps support the hand in a functional position and prevents stiffness. It can also make daily activities easier while the nerve recovers.
2. Physiotherapy and Hand Therapy
Physiotherapy plays an important role in recovery. Exercises help maintain joint mobility, prevent stiffness, improve muscle strength, and support functional hand use.
Therapy may include:
Wrist and finger range-of-motion exercises
Grip strengthening
Nerve gliding exercises
Muscle re-education
Splint training
Functional hand exercises
Many radial nerve palsy cases are initially managed conservatively with splinting and rehabilitation, especially when the nerve is compressed but not completely cut.
3. Treating the Underlying Cause
If the nerve problem is due to a fracture, cast pressure, swelling, or compression, the underlying cause must be treated properly. For fracture-related palsy, the bone injury and nerve function are monitored carefully.
4. Medicines
Pain-relieving medicines, anti-inflammatory medicines, or nerve-related medicines may be advised depending on symptoms. Medicines should be taken only as prescribed by the doctor.
5. Observation and Follow-Up
Some nerve injuries recover gradually over weeks to months. Regular follow-up is important to check whether wrist and finger movement is improving.
6. Surgical Treatment
Surgery may be needed if the nerve is severely injured, trapped, compressed, cut, or not recovering as expected. Surgical options may include nerve exploration, decompression, nerve repair, nerve grafting, or tendon transfer in selected cases.
The decision for surgery depends on injury type, duration, EMG findings, fracture condition, and clinical recovery.
Recovery From Radial Nerve Palsy
Recovery varies from patient to patient. Mild compression injuries may improve faster, while severe trauma-related nerve injuries can take months. Recovery depends on:
Severity of nerve damage
Cause of injury
Age and general health
Associated fracture or soft tissue injury
Time taken to start treatment
Physiotherapy compliance
Need for surgery
Patients should not delay evaluation, especially if wrist drop appears suddenly or follows a fracture or injury.
Can Radial Nerve Palsy Be Prevented?
Not all cases can be prevented, especially those caused by accidents or fractures. However, some precautions can reduce risk:
Avoid sleeping with prolonged pressure on the arm
Avoid tight casts, bands, or compression around the arm
Use crutches properly
Treat fractures and injuries early
Report numbness or weakness after plaster application
Follow physiotherapy advice after injury
Avoid ignoring hand weakness after trauma
Expert Care for Radial Nerve Palsy at ONUS Robotic Hospitals
At ONUS Robotic Hospitals, patients with wrist drop, radial nerve palsy, fracture-related nerve injuries, hand weakness, and upper limb trauma receive advanced orthopedic evaluation and personalized treatment.
Early diagnosis, proper nerve assessment, fracture management, splinting, physiotherapy, and surgical planning when needed can help improve functional recovery.
For Appointments:
Dr. Balaraju Naidu, Robotic Orthopedic Surgeon
ONUS Robotic Hospitals β Hyderabad
π link: contact-us or book-appointment
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