Spinal cord stimulation, also known as spinal cord neurostimulation or “spinal cord stimulation”, has become a real option for people with chronic low back pain and persistent sciatica, especially when other treatments have failed. However, it is not a magic solution and it does not work in every case.
In this article you will find 10 key points to understand what spinal cord stimulation involves, when it can help, which tests are needed, what real benefits it can offer and which risks you should know about before considering it. This is general information and never replaces a personalised assessment by a team specialised in spine and chronic pain.
If you only remember a few ideas, let them be these:
- Spinal cord stimulation is mainly aimed at chronic neuropathic pain (sciatica, burning pain, tingling) that has not responded to properly indicated surgery, medication or rehabilitation.
- Before a permanent implant is placed, a temporary trial phase is carried out: if there is no clear and significant improvement in pain and function, it is not recommended to continue.
- It does not cure the structural cause, but it can reduce pain and improve quality of life in carefully selected patients.
- It has risks (infection, lead problems, changes in pain pattern) that must be weighed against the potential benefit.
- The decision should be shared: an informed patient, the spine team and the pain unit working together.
1. What exactly is spinal cord stimulation?
Spinal cord stimulation is a neuromodulation technique. One or more thin electrodes are placed in the epidural space, behind the spinal cord, and connected to a generator (similar to a “pacemaker for pain”). The device delivers programmable electrical impulses that modify the transmission of pain signals to the brain.
Nowadays there are different stimulation modes (tonic, high frequency, burst, alternating field patterns), which are adjusted according to the patient’s profile and clinical response. The goal is not to “put the spinal cord to sleep”, but to modulate specific circuits related to chronic neuropathic pain.
2. What types of pain is it used for?
Not all back pain is a candidate for spinal cord stimulation. In general, it is considered in people with:
- Neuropathic pain (burning, electric shock like, with tingling) in the legs or lower back that persists despite appropriate treatment.
- Failed back surgery syndrome, that is, pain that continues or reappears after one or more spine surgeries, without a new clear compression that would justify another major operation.
- Chronic radicular pain when it is not possible or not advisable to repeat surgery.
- Certain patterns of ischaemic pain (for example in the lower limbs) or complex neuropathic pain after trauma, always evaluated by specialised units.
On the other hand, it is usually less useful for purely mechanical, localised pain (pain that appears almost only when moving or carrying weight, without a sciatica component or neurological changes), where other options such as rehabilitation, pain education and, in some cases, surgery remain the main pillars.
3. Who is a good candidate and who is not?
Careful patient selection is critical. A suitable candidate usually meets several criteria:
- Chronic pain lasting more than 6 months, with a major impact on quality of life and daily functioning.
- Documented failure of well conducted conservative treatments: active physiotherapy, optimised medication, pain education and, where appropriate, less invasive interventional procedures.
- Up to date spine imaging that rules out a mechanical compression that could be corrected by other techniques.
- Realistic expectations: looking to reduce pain and improve function, not to “go back to zero” or “forget about the illness completely”.
- Ability to handle the device and attend regular follow up appointments.
In some situations, spinal cord stimulation may not be advisable or may require a much more detailed analysis: active infections, severe coagulation disorders, unstable psychiatric conditions, certain uncontrolled immune or connective tissue diseases, and situations of severe biomechanical instability that still require structural correction.
4. What tests and assessments are needed beforehand?
Before considering spinal cord stimulation, a comprehensive evaluation is recommended:
- Detailed medical history: course of the pain, previous surgeries, response to treatments, associated neurological symptoms.
- Neurological and musculoskeletal examination: strength, sensation, reflexes, gait, functional tests.
- Recent imaging studies: magnetic resonance imaging or CT scan of the affected spine, and in some cases dynamic or segmental studies.
- Assessment by a pain unit: review of medication, previous injections and other interventional techniques.
- Psychosocial evaluation: depression, anxiety, catastrophising, work and family environment, expectations regarding the technique.
In complex patients (for example with Ehlers-Danlos syndrome, MCAD or other systemic conditions), it may also be necessary to include inflammatory biomarkers, allergies to materials or drugs and a specific anaesthetic plan.
5. The trial phase: why it matters so much
One of the advantages of spinal cord stimulation is that a temporary trial phase is almost always carried out first. In this phase:
- Electrodes are placed through a small procedure, but the generator remains external or a temporary system is used.
- Over several days or a few weeks, stimulation parameters are adjusted while the patient records pain level, medication use and functional capacity.
- If pain and function improve in a clear and sustained way, definitive implantation of the generator is considered.
- If there is not enough improvement, the electrodes are removed and other alternatives are reconsidered.
This phase makes it possible to check in real life whether neuromodulation really helps that particular person. A brief “slightly better” sensation for a day or two is not enough: measurable, stable changes over time are sought.
6. Real benefits: what you can expect and what you cannot
Studies on spinal cord stimulation show that a significant proportion of patients achieve a meaningful reduction in pain, especially when the neuropathic component is clearly defined and selection criteria are strict.
The most common benefits when the technique works are:
- Less pain at rest and with movement.
- Reduced use of painkillers, especially long term opioids.
- Improved ability to walk, sit and carry out everyday activities.
- Better sleep quality and a greater sense of control over the illness.
However, it is important to be clear that:
- Spinal cord stimulation does not correct marked deformities or significant instabilities of the spine.
- It does not completely replace physiotherapy, lifestyle changes and the psychosocial approach to chronic pain.
- Not all patients achieve a sufficient response; this is why the trial phase is so important.
7. Risks and possible complications
Like any invasive procedure, spinal cord stimulation carries risks. Some of the most relevant are:
- Infection: it may affect the wound, the lead path or the generator itself and, in severe cases, require removal of the system.
- Mechanical problems: electrode migration, lead breakage or generator failure, which may require reprogramming or reoperation.
- Changes in the stimulation pattern: areas that are poorly covered by the stimulus, unpleasant tingling or loss of effect over time.
- Uncommon neurological complications: epidural bleeding, injury to nerve roots or the dura, usually avoided with careful technique and imaging guidance.
- Psychological impact: frustration if the result does not meet expectations, feeling dependent on the device.
In patients with complex systemic diseases, there may be additional risks related to anaesthesia, allergies to materials or drugs, or wound healing. This is why the indication should come from an experienced team with clear protocols for prevention and follow up.
8. Non surgical and surgical alternatives
Spinal cord stimulation is never the first option. Before considering it, patients usually follow a pathway that includes:
- Active rehabilitation and pain education: programmes that combine graded exercise, posture hygiene and strategies to cope better with pain.
- Optimised pharmacological treatment: multimodal painkillers, neuromodulating drugs and, in some cases, pharmacogenetic approaches.
- Injections or interventional procedures: rhizolysis, facet blocks, foraminal or epidural injections, depending on the origin of the pain.
- Psychosocial approach: management of anxiety, depression, insomnia and stress factors that amplify pain.
As for surgical alternatives, further decompressions, fusions or revision surgeries may be considered when there is a clear mechanical cause (stenosis, instability, pseudoarthrosis, recurrent herniation, etc.). In some patients, the balance tips towards neuromodulation if another surgery entails high risks or a low probability of success.
9. When to refer to a pain unit or specialised team
Some situations in which it is worth considering referral to a specialised pain and complex spine unit are:
- Low back and radicular pain persisting for more than 6 to 12 months despite a structured treatment plan.
- Patients with one or more spine surgeries and pain that still significantly interferes with daily life.
- A combination of neuropathic pain, sleep disturbances, low mood and marked functional limitation.
- People with systemic conditions (Ehlers-Danlos, MCAD, rheumatological diseases) where pain is disproportionate to imaging findings.
- Cases in which spinal cord stimulation or revision surgery has been proposed and the patient wants a second opinion.
Referral does not mean committing automatically to spinal cord stimulation, but gaining access to a more detailed evaluation that helps to organise options, timing and expectations.
10. Recovery times and life with a stimulator
After the definitive implant, most people need a few days of relative rest and several weeks to adapt to the device and to programming adjustments. It is common to:
- Feel local discomfort in the area of the generator or along the lead path during the first weeks.
- Need several reprogramming sessions to find the parameters that best control pain without troublesome side effects.
- Follow a progressive rehabilitation plan to recover strength, mobility and endurance.
In the medium term, many people can resume everyday, work and leisure activities that were previously impossible because of pain. However, they must follow certain recommendations (avoid extreme sudden movements, inform healthcare staff before MRI scans depending on the device model, attend regular check ups).
When should you go to the emergency department?
Although most postoperative courses evolve without serious problems, it is important to go immediately to the emergency department if any of the following appear:
- High fever, marked redness or discharge at the wound site.
- Sudden, progressive neurological pain different from the usual one.
- New loss of strength in the legs, difficulty controlling bladder or bowel, or walking problems that were not present before.
- Very intense back pain accompanied by a feeling of pressure inside the spinal canal.
These symptoms may indicate complications such as infection, epidural haematoma or mechanical problems with the system that require urgent evaluation.
Myths and facts about spinal cord stimulation
Myth: “If I have a stimulator, I will never feel pain again.” Fact: The aim is to reduce pain and improve quality of life, not to eliminate pain completely.
Myth: “Spinal cord stimulation works for any type of back pain.” Fact: It is mainly intended for neuropathic pain and well selected failed back surgery syndrome, not for all mechanical low back pain.
Myth: “If I have it implanted, I will no longer need rehabilitation.” Fact: The technique works best when combined with exercise, pain education and lifestyle changes.
Myth: “It is a minor procedure without risks.” Fact: It is less aggressive than many surgeries, but it is still an invasive technique with possible complications.
Frequently asked questions about spinal cord stimulation
Is spinal cord stimulation reversible?
Yes. The system can be switched off by programming and, if necessary, removed surgically. This does not guarantee that everything will return exactly to the previous state, but it offers a greater degree of reversibility than many more aggressive techniques.
How long does the generator last?
It depends on the type of device and the configuration used. Some generators have rechargeable batteries and can last many years with proper maintenance. Others need to be replaced when the battery runs out. The team will explain the options before the implant.
Will I be able to go through security scanners and have MRI scans?
Many modern systems are designed to be compatible with certain MRI environments under specific protocols. It is essential to always inform healthcare professionals that you have a spinal cord stimulator and to follow the manufacturer’s and hospital’s instructions. As for security gates, most patients can pass through them without problems, although alarms may be triggered and identification may be required.
Will I still need pain medication after the implant?
In many cases, it is possible to reduce the dose or number of drugs, but it is not always possible to stop all medication. The goal is to find a balance between the effect of the stimulator, pharmacological treatment and non pharmacological strategies.
Can spinal cord stimulation make my underlying condition worse?
In general, the technique does not speed up structural degeneration of the spine. However, if there is significant untreated instability, severe compressions or complex systemic comorbidities, the indication must be assessed carefully and the overall treatment plan adjusted.
A responsible call to action
If you live with chronic low back pain or failed back surgery syndrome, it is understandable that you are looking for a way out. Spinal cord stimulation can be a useful tool in selected profiles, but only after a full evaluation and a shared decision making process.
Talk to a specialist in spine surgery and to a pain unit with experience in neuromodulation. Bring your reports, imaging studies and your questions in writing. An individual assessment is the only way to know whether this option truly fits your case.
References
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- Dr. Vicenç Gilete, Neurosurgeon and Spine Surgeon. Excellence in lumbar surgery.
- Revista Colombiana de Anestesiología. Colombian adaptation of the spinal cord stimulation guidelines for refractory chronic pain.
- Pain and neuromodulation societies. Recent clinical guidelines on spinal cord stimulation in failed back surgery syndrome and chronic neuropathic pain.
- RTVC. The Hospital Molina Orosa incorporates a spinal neuromodulation system to treat chronic pain.
- MiViSalud. Neurostimulation treatment: what it is and what it is used for.
- Recent reviews on chronic low back pain and failed back surgery syndrome in neurosurgery, anaesthesiology and rehabilitation journals, focusing on patient selection and functional outcomes of spinal cord stimulation.
This content is for educational purposes only and does not in any case replace an in person or telemedicine medical consultation. It should not be used to establish diagnoses or modify treatments without the direct supervision of qualified healthcare professionals.
