The Radial Nerve
The radial nerve is a nerve that supplies muscles responsible for extension of the elbow, outward movement of the forearm, and extension of the wrist and fingers. It runs down the back of the arm, travelling to the front of the elbow, and then down the forearm.
What is Radial Nerve Palsy?
Radial nerve palsy occurs when there is injury or compression of the radial nerve, affecting its function. This may present with varying degrees of weakness of the abovementioned muscles, depending on the level of injury to the radial nerve.
Diagnosis
The diagnosis of radial nerve palsy and the level of injury is determined based on the extent of weakness and numbness.
Additional tests such as X-rays, electrodiagnostic studies, nerve ultrasound or even Magnetic Resonance Imaging (MRI), may be needed, depending on the underlying cause for the radial nerve palsy.
Treatment for radial nerve palsy depends on the underlying cause.
- If the nerve is cut, surgical repair or grafting is recommended.
- If the radial nerve palsy is due to external compression, surgical decompression may be required.
- Other procedures (such as tendon transfer surgery) may be recommended, depending on the timing from injury and chance of recovery.
After the operation, supportive or functional splints are provided to maintain the posture of the wrist and fingers, while the nerve recovers. Therapy is needed to maintain joint mobility and slowly strengthen the involved muscles. Recovery may take up to 6 months or beyond.
In most cases, the radial nerve palsy is only expected to be temporary. Progressive signs of nerve recovery may be observed over a period of 3 - 6 months. Interval splinting and therapy is recommended while awaiting recovery.
