Spinal Cord Stimulation (SCS)
Spinal cord stimulation (SCS) is a neuromodulation technique that delivers low-level electrical stimulation to the spinal cord through electrodes placed in the epidural space to manage chronic neuropathic pain. It is not a cure but a method aimed at reducing pain, and it is generally considered in refractory pain conditions such as failed back surgery syndrome (FBSS).
最終更新: 2026-06-09
Definition
Spinal cord stimulation is a neuromodulation system consisting of one or more electrodes placed in the posterior epidural space over the spinal cord and a generator (battery) placed under the skin, intended to modify pain signals. The low-level electrical stimulation delivered aims to suppress or alter the perception of pain. SCS is not a treatment that eliminates the underlying disease; the goal is to reduce pain and improve function and quality of life. The system is usually tested first with a temporary trial, and a permanent system is implanted if benefit is observed.
Indications
SCS is considered in chronic neuropathic pain conditions that have not responded adequately to other treatments. The most common indications include failed back surgery syndrome (FBSS), persistent spinal pain syndrome, complex regional pain syndrome (CRPS), and selected peripheral neuropathic pain conditions. In candidate selection it is important that the pain is neuropathic in character, that conservative and pharmacological treatments have been insufficient, and that psychological evaluation is favorable. The NICE appraisal (TA159) addressed SCS as an option for patients with chronic neuropathic pain lasting at least 6 months that has not responded to appropriate medical treatment and who respond during a trial period.
Procedure
The procedure is usually performed in two stages. In the trial stage, under local anesthesia and sedation with fluoroscopic guidance, a thin electrode is placed in the epidural space; its leads are connected to a temporary external generator, and the patient assesses the pain response over several days. If sufficient pain reduction is achieved, a permanent system is implanted: the electrode is secured in the epidural space and connected to a permanent generator placed under the skin. The electrode may be placed percutaneously via a needle or, when needed, through a small laminotomy. The device is then programmed according to the patient's needs.
Advantages and Limitations
The main advantage of SCS is that it is reversible and adjustable, and that a trial period before the permanent system helps predict the response; in appropriately selected patients it can reduce pain and medication use. However, it is not a cure, and its effect varies from patient to patient; some patients do not obtain adequate benefit or the effect may diminish over time. Device-related problems, electrode migration, and the need for regular follow-up/battery management are limitations. Correct indication, multidisciplinary evaluation, and realistic expectation management are critical for success.
Recovery and Risks
Recovery time varies by patient and by the extent of the procedure; with percutaneous placement, recovery is usually short. Possible risks include infection, electrode migration or fracture, device malfunction, epidural bleeding or hematoma, dural tear and cerebrospinal fluid leak, changes in the pain pattern, and the need for reintervention. Pain may not be reduced sufficiently, or the response may decline over time. No outcome is guaranteed; the decision is individualized by considering the patient's clinical status, the character of the pain, the trial-period response, and expectations together.
参考文献
- Greenberg MS. Greenberg's Handbook of Neurosurgery. 10th ed. Thieme; 2023:1884-1886.
- Winn HR, ed. Youmans Neurological Surgery. 6th ed. Saunders; 2011:1809-1820.
- Steinmetz MP, Berven SH, Benzel EC, eds. Benzel's Spine Surgery: Techniques, Complication Avoidance, and Management. 5th ed. Elsevier; 2022:695-701.
- National Institute for Health and Care Excellence (NICE). Technology appraisal guidance TA159: Spinal cord stimulation for chronic pain of neuropathic or ischaemic origin.
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