Nerve root injections

What is a nerve root – and why can it hurt?

Nerve roots are the parts of the nerves that emerge from the spinal canal on the left and right. They supply skin, muscles and reflexes in characteristic supply areas. If the nerve root is irritated by an intervertebral disc, bony narrowness (spinal canal or foramen stenosis) or inflammation, radicular pain occurs - typically electrifying or burning and along a specific course in the arm (cervical) or leg (lumbar). Common accompanying symptoms include tingling, numbness or loss of strength.

• Causes: Herniated/bulging disc, foraminal stenosis, facet joint arthrosis with irritation, postoperative irritation
• Symptoms: radiating pain, sensitive tingling/numbness, occasionally muscle weakness
• Aim of the injection: to dampen inflammation, reduce swelling, and relieve pressure on the nerve root

When are nerve root injections useful?

Injection to the nerve root is considered if radicular pain persists or is particularly severe despite conservative therapy according to guidelines. As a rule, it is not a first measure, but complements medication, physiotherapy and activity control.

• Proven or suspected disc herniation/prolapse with radicular pain
• Foraminal or spinal canal stenosis with root irritation symptoms
• Postoperative irritation (e.g. scar surroundings) after individual examination
• If pain currently prevents active therapy (physiotherapy, training).

In the event of progressive paralysis, defecation/urination disorders or other warning signs, an urgent specialist or emergency examination is required; An injection does not replace acute care.

Conservative alternatives before and alongside the injection

Since we work conservatively, we first examine non-invasive options. Acute radicular pain can often be controlled without an injection. Nerve root injections are preferred when these measures have been exhausted or a targeted anti-inflammatory effect is needed.

• Pain and inflammatory medication according to a step-by-step scheme
• Physiotherapy: nerve mobilizing exercises, posture and strength training
• Activity control, ergonomic adjustments, heat therapy
• Manual medicine, short-term stabilization aids (e.g. lumbar support) in individual cases
• Multimodal pain therapy for chronic processes

Procedure variants: PRT and transforaminal injection

In practice, image-guided, precise placement of the cannula on the affected nerve root has proven successful. CT or X-ray fluoroscopy-assisted procedures are common. The terms are sometimes used synonymously; Technically, however, there are variants.

• Periradicular therapy (PRT): Injection near the nerve root in the foramen; usually CT-supported
• Transforaminal epidural injection: Access through the foramen into the epidural space
• Interlaminar epidural injection: access between the vertebral arches, especially a. in central stenosis
• Regions: cervical (cervical spine), thoracic (thoracic spine, rare), lumbar/sacral (lumbar spine, common)

Which variant makes sense depends on the findings, anatomy, safety aspects and experience of the practitioner. We will discuss the individual approach with you and, if necessary, cooperate with radiological partners on imaging.

How nerve root injection works

The combination of a local anesthetic and a low-dose corticosteroid is standard. The local anesthetic can dampen the transmission of pain in the short term, while the corticosteroid has an anti-inflammatory and anti-swelling effect on the nerve root area for days to weeks. This often improves the stimulus situation and gives the nerve “rest” to recover.

• Goal: reduce inflammatory mediators, reduce perineural swelling
• Secondary effects: better tolerance for activity and physiotherapy
• Additional diagnostic benefit: Relief in a typical dermatome supports the assignment of the source of the symptoms

Preliminary diagnostics and education

Before each injection, there is a thorough anamnesis, neurological examination and a review of existing imaging (MRI/CT) - if necessary, this will be arranged. The injection only makes sense if the clinical picture and findings match.

• History: course of pain, radiation, numbness/strength, previous illnesses
• Examination: reflexes, strength, sensitivity, Lasègue/Spurling depending on the region
• Findings: MRI/CT to localize the nerve root irritation
• Medication check: anticoagulants, diabetes, allergies
• Education: benefits, risks, alternatives, driving ability

Nerve root injection procedure

The treatment is sterile and usually image-supported. Sedation is usually not necessary; Most patients find the sting to be short and easy to tolerate.

A feeling of warmth or pressure may occur immediately after the injection. An initial improvement is sometimes noticeable immediately, but more often within 24-72 hours.

Aftercare, behavior and training

After the injection, you should take it easy on the same day and avoid sudden movements. Light everyday activity is usually allowed. As soon as the pain subsides, it makes sense to gradually start exercise programs - this increases the chance of lasting stabilization.

• Do not drive for 24 hours if you experience numbness/weakness
• Cooling possible in the event of an irritant reaction at the puncture site
• Early, guided exercises (nerve mobilization, core strength/posture)
• Follow-up appointment for follow-up checks and therapy adjustments

Risks and possible side effects

Nerve root injections are considered a safe procedure when carried out professionally, but side effects are still possible. We will inform you in detail in advance and take safety precautions.

• Common: temporary increased pain, numbness, bruising at the injection site
• Uncommon: increase in blood pressure/blood sugar (cortisone), facial flushing, restlessness
• Rare: infection, allergic reaction, vascular entry with dizziness/metal taste, headache
• Very rare: nerve irritation/injury, dural puncture, serious complications

If you have a fever, increasing weakness, severe headaches when standing, severe redness/warmth or new neurological deficits, please seek medical help immediately.

Safety check and contraindications

A nerve root injection is not indicated in every situation. A careful risk-benefit assessment is a prerequisite.

• Acute infections/fever, local skin infection
• Inadequate anticoagulation or blood clotting disorder
• Severe allergy to local anesthetics/corticosteroids
• Pregnancy: strict indications; prefer alternative concepts
• Serious neurological deficits: primarily check for urgent clarification/surgical indication
• Poorly controlled diabetes: close blood sugar monitoring required

Prospects of success and evidence

Studies show that targeted nerve root injections can provide short- to medium-term relief of radicular pain in selected patients. The effect varies from person to person and is not guaranteed. Particularly in the case of root irritation caused by intervertebral discs, injections can create time for the inflammation to resolve naturally and make active therapy easier.

• Effectiveness: often noticeable within days, duration variable (weeks to months possible)
• Less suitable for: predominantly axial back pain without radiation
• Therapy cycle: often 1-3 injections 1-3 weeks apart; only continue if it is beneficial
• The aim remains to improve function and active training - not just the injection

Checklist: Preparation for the injection

• Bring a list of medications with you (including blood thinners, anti-diabetics)
• Current imaging (MRI/CT) – if available
• Report any allergies, suspected pregnancy, or infections in advance
• Comfortable clothing on the day of treatment, accompanying person if unsure
• Do not plan any important decisions/trips that require a driving license after the injection

Special situations

• Cervical spine injections: require special care; Check benefit-risk individually
• Multisegmental stenoses: interlaminar epidural technique can be considered
• Postoperative scars: effect sometimes less; individual strategy necessary
• Concomitant diseases: diabetes, osteoporosis, anticoagulation – adjust dose and timing

Related and alternative injection procedures

Not all pain in the spine comes from the nerve root. Depending on the findings, facet joints, the sacroiliac joint or muscular trigger points may be responsible. Then other targeted infiltrations make more sense.

• Facet infiltration in osteoarthritis-related back pain
• SIJ infiltration for pain in the sacrum-iliac joint
• Trigger point injections for myofascial pain
• Periradicular therapy (PRT) as a specific form of nerve root injection

When should surgery be considered?

Surgery may be considered if there are severe or increasing neurological deficits, persistent severe radicular pain despite conservative measures, or warning signs such as urinary/stool incontinence. Nerve root injections are not a substitute for surgical relief, but in borderline cases they can help to bridge time or clarify the diagnosis.

Organization, frequency and cost information

The number of injections depends on the effect and tolerability. A step-by-step approach has proven to be successful: after the first injection, follow-up and only repeat if there is evidence of benefit. We will inform you transparently in advance about individual cost and reimbursement questions; Coverage may vary depending on the provider.

Your contact point in Hamburg

Our orthopedic practice at Dorotheenstrasse 48, 22301 Hamburg, offers you evidence-based, conservative treatment of spinal problems. We carefully examine whether a nerve root injection makes sense in your case and - if indicated - integrate it into a holistic concept of education, exercise therapy and pain management.