Patient and procedural risk factors for decline in lower-extremity motor scores following adult spinal deformity surgery

Author:

Mohanty Sarthak1,Hassan Fthimnir M.1,Lenke Lawrence G.1,Burton Douglas2,Daniels Alan H.3,Gupta Munish C.4,Kebaish Khaled M.5,Kelly Michael6,Kim Han Jo7,Klineberg Eric O.8,Passias Peter G.9,Protopsaltis Themistocles9,Schwab Frank10,Shaffrey Christopher I.11,Smith Justin S.12,Line Breton G.13,Lafage Renaud10,Lafage Virginie10,Bess Shay13

Affiliation:

1. Department of Orthopaedic Surgery, The Och Spine Hospital/Columbia University Irving Medical Center, New York, New York;

2. Department of Orthopaedic Surgery, University of Kansas Medical Center, Kansas City, Kansas;

3. Department of Orthopaedic Surgery, University Orthopedics, Providence, Rhode Island;

4. Department of Orthopaedic Surgery, Washington University School of Medicine, St. Louis, Missouri;

5. Department of Orthopaedic Surgery, Johns Hopkins Medical Institute, Baltimore, Maryland;

6. Department of Orthopaedic Surgery, Rady Children’s Hospital, San Diego, California;

7. Department of Orthopaedic Surgery, Hospital for Special Surgery, New York, New York;

8. Department of Orthopaedic Surgery, University of California Davis Medical Center, Sacramento, California;

9. Department of Orthopaedic Surgery, New York University Langone Medical Center, New York, New York;

10. Department of Orthopaedic Surgery, Northwell Health Lenox Hill, New York, New York;

11. Department of Neurosurgery, Duke University Medical Center, Durham, North Carolina;

12. Department of Neurosurgery, University of Virginia Medical Center, Charlottesville, Virginia; and

13. Department of Spine Surgery, Denver International Spine Clinic, Denver, Colorado

Abstract

OBJECTIVE The purpose of this study was to discern factors that differentiate patients who experience postoperative lower-extremity motor function decline in the early postoperative period. METHODS Adult spinal deformity (ASD) patients who were enrolled in a multicenter, observational, and prospectively collected study from 2018 to 2021 at 18 spinal deformity centers in North America were queried. Eligible participants met at least one of the following radiographic and/or procedural inclusion criteria: pelvic incidence minus lumbar lordosis (PI-LL) ≥ 25°, T1 pelvic angle (T1PA) ≥ 30°, sagittal vertical axis (SVA) ≥ 15 cm, thoracic scoliosis ≥ 70°, thoracolumbar scoliosis ≥ 50°, global coronal malalignment ≥ 7 cm, 3-column osteotomy, spinal fusion ≥ 12 levels, and/or age ≥ 65 years with ≥ 7 levels of instrumentation. Patients with an inflammatory or autoimmune disease and those who were incarcerated or pregnant were excluded, as were non-English speakers. Only patients with baseline and 6-week postoperative lower-extremity motor score (LEMS) were analyzed. Patient information, including demographic data, operative data, patient-reported outcomes, and radiographic parameters, were collected. Univariate and multivariable logistic regression models were built to quantify the degree to which a patient’s postoperative LEMS decline was related to demographic and clinical characteristics. RESULTS In total, 205 patients (mean age 61.5 years, mean total instrumented levels 12.6, 67.3% female, 54.2% primary cases, 79.5% with pelvic fixation) were evaluated. Of these 205 patients, 32 (15.5%) experienced LEMS decline in the perioperative period. These patients were older (p = 0.0014) and had greater BMI (p = 0.0176), higher frailty scores (p = 0.047), longer operating room times (p = 0.033), and greater estimated blood loss (p < 0.0001), and they were more frequently observed to have intraoperative neurophysiological monitoring (IONM) changes (p = 0.018). The deteriorated cohort had greater C7SVA at baseline (p = 0.0028) but were comparable in terms of all other radiographic parameters. No radiographic differences were seen between the groups at the 6-week visit; however, the deteriorated cohort experienced greater change in PI-LL (p < 0.0001), lumbar lordosis (p = 0.0461), C7SVA (p = 0.0004), and T1PA (p < 0.0001). Multivariate logistic regression demonstrated that the presence of IONM changes and each degree of negative change in T1PA conferred 3.71 (95% CI 1.01–13.42) and 1.09 (1.01–1.19) greater odds of postoperative LEMS deterioration, respectively. CONCLUSIONS In this study, 15.6% of ASD patients incurred LEMS decline in the perioperative period. The magnitude of change in global sagittal alignment, specifically T1PA, was the strongest independent predictor of LEMS decline, which has implications for surgical planning, patient counseling, and clinical research.

Publisher

Journal of Neurosurgery Publishing Group (JNSPG)

Subject

General Medicine

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