Spinal cord stimulation for chronic, intractable pain: experience over two decades

Area of Science:

• Neurosurgery
• Pain Management
• Biomedical Engineering

Background:

• Spinal cord stimulation (SCS) technology has significantly evolved over the past two decades.
• Early SCS systems used single-channel devices requiring laminectomy for electrode placement.
• Current SCS utilizes programmable multichannel systems with percutaneous electrode insertion.

Purpose of the Study:

• To review institutional experience with SCS devices from 1972 to 1990.
• To assess technical and patient factors predicting clinical outcome and hardware reliability.
• To evaluate the long-term efficacy and safety of evolving SCS technology.

Main Methods:

• Retrospective review of 320 consecutive patients treated with SCS.
• Analysis of 205 patients with 2-20 years of follow-up (mean 7.1 years).
• Univariate and multivariate statistical methods to identify predictors of outcome and reliability.
• Outcome measures included pain ratings, employment, daily activities, and analgesic use.

Main Results:

• At a mean 7-year follow-up, 52% of patients with permanent implants reported sustained pain relief (>50%).
• Improvements in daily activities and reduced analgesic use were maintained by a majority of patients.
• Programmable multichannel SCS demonstrated significantly fewer clinical and technical failures compared to single-channel systems (P < 0.001).
• Reduced electrode migration and malposition were noted with multichannel devices (P = 0.025).

Conclusions:

• Evolving SCS technology, particularly programmable multichannel systems, enhances clinical outcomes and hardware reliability.
• Patient selection based on prognostic factors can optimize SCS procedure success.
• SCS remains an effective long-term treatment for chronic pain, with continuous technological advancements improving patient care.