About Chemoneurolysis
Chemoneurolysis uses a small amount of phenol or alcohol to partially disable a nerve. When the target is a nerve that controls an overactive muscle, the muscle relaxes. When the target is a sensory nerve, pain signals are reduced. Over time the nerve recovers, so the effect wears off and can be repeated.
It is often used alongside or instead of botulinum toxin for spasticity, particularly when large muscle groups such as the hip adductors, elbow flexors, or calf are involved. The goal is practical: easier walking, dressing, hygiene, splint use, or positioning.
Dr. Chen locates the nerve with ultrasound and mild electrical stimulation, which makes the target muscle twitch and confirms the needle position before any medication is placed.
What happens during treatment
- 1.
Dr. Chen evaluates muscle tone, range of motion, and your functional goals, and reviews any prior treatments.
- 2.
A test block with local anesthetic may be done first to show how the limb will respond when the nerve is quieted.
- 3.
The skin is cleaned, and a thin needle is guided to the nerve under ultrasound and electrical stimulation.
- 4.
The medication is injected in small amounts. You go home the same day with a therapy plan to use the improved range of motion.
Who may be a good candidate
- People with spasticity after a stroke, brain injury, spinal cord injury, or multiple sclerosis that limits function or care.
- People whose spasticity involves large muscles that would need very high doses of botulinum toxin.
- People with selected chronic nerve pain in whom other treatments have not worked well enough.
Recovery
Most people return to their usual routine right away. The effect on muscle tone is often noticeable within days. Stretching, splinting, and strengthening work in the weeks afterward help you get the most from the treatment. Effects typically last several months before the nerve recovers.
Risks and limits
The most important risk is dysesthesia, a burning or uncomfortable sensation that can occur when the treated nerve also carries sensation. It is usually temporary but can be bothersome. Other possible effects include local pain, swelling, bruising, and more weakness than intended. Infection is rare. Chemoneurolysis is not the right choice for everyone with pain, and we reserve it for carefully selected situations.
What to expect at your visit
- 1.
We listen first
Your visit opens with a real conversation: how the problem started, what you have already tried, and the activity you want back.
- 2.
Exam and in-office ultrasound
A hands-on exam, then ultrasound at the exam table, often while you move, so your physician can see the tendon, joint, or nerve involved.
- 3.
A clear diagnosis and plan
You leave knowing what is wrong and what your options are, from strength-based rehab to procedures, and why we recommend each one.
- 4.
Treatment and follow-through
Most procedures happen here in the office. We coordinate with your physical therapist and check progress against the goals you set.
Questions about Chemoneurolysis
- How is chemoneurolysis different from botulinum toxin?
- Botulinum toxin works at the junction between nerve and muscle, while chemoneurolysis acts on the nerve itself. Chemoneurolysis can treat large muscle groups without the dose limits of botulinum toxin, and the two are often used together.
- Is chemoneurolysis permanent?
- No. The nerve gradually recovers, so the effect usually lasts several months. The treatment can be repeated if it helped.
- Does chemoneurolysis hurt?
- The needle and electrical stimulation can be uncomfortable, and phenol can sting briefly as it is injected. Most people tolerate the procedure well, and soreness afterward is usually mild.