Examination of Adult Spinal Deformity Patients Undergoing Surgery with Implanted Spinal Cord Stimulators and Intrathecal Pumps.

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Spine (Phila Pa 1976)


washington; seattle; swedish neuro


STUDY DESIGN: Retrospective cohort study of a prospectively collected multi-center database of adult spinal deformity (ASD) patients.

OBJECTIVE: We hypothesized that patients undergoing ASD surgery with and without previous SCS/ITP would exhibit increased complication rates but comparable improvement in HRQOL.

SUMMARY OF BACKGROUND DATA: ASD patients sometimes seek pain management with spinal cord stimulators (SCS) or intrathecal medication pumps (ITP) prior to spinal deformity correction. Few studies have examined outcomes in this patient population.

METHODS: Patients undergoing ASD surgery and eligible for 2-year follow-up were included. Pre-operative radiographs were reviewed for the presence of SCS/ITP. Outcomes included complications, ODI, SF-36 MCS, and SRS-22r. Propensity score matching was utilized.

RESULTS: In total, out of 1,034 eligible ASD patients, a propensity score-matched cohort of 60 patients (30 with SCS/ITP, 30 controls) was developed. SCS/ITP were removed intra-operatively in most patients (56.7%, n = 17). The overall complication rate was 80.0% versus 76.7% for SCS/ITP versus control (p > 0.2), with similarly non-significant differences for intraoperative and infection complications (all p > 0.2). ODI was significantly higher among patients with SCS/ITP at baseline (59.2 versus 47.6, p = 0.0057) and at 2-year follow-up (44.4 versus 27.7, p = 0.0295). The magnitude of improvement, however, did not significantly differ (p = 0.45). Similar results were observed for SRS-22r pain domain. Satisfaction did not differ between groups at either baseline or follow-up (p > 0.2). No significant difference was observed in the proportion of patients with SCS/ITP versus control reaching MCID in ODI (47.6% versus 60.9%, p = 0.38). Narcotic usage was more common among patients with SCS/ITP at both baseline and follow-up (p < 0.05).

CONCLUSIONS: ASD patients undergoing surgery with SCS/ITP exhibited worse preoperative and post-operative ODI and SRS-22r pain domain; however, the mean improvement in outcome scores was not significantly different from patients without stimulators or pumps. No significant differences in complications were observed between patients with versus without SCS/ITP.Level of Evidence: 3.

Clinical Institute

Neurosciences (Brain & Spine)

Clinical Institute

Orthopedics & Sports Medicine