Spine J. 2023 Aug 22:S1529-9430(23)03344-2. doi: 10.1016/j.spinee.2023.08.006. Online ahead of print.
ABSTRACT
BACKGROUND CONTEXT: Standard partial facetectomies, [Smith-Petersen Osteotomy, (SPO)], (Schwab-grade-I) and complete facet resection also known as Ponte osteotomy, [PO], (Schwab-grade-II) are narrowly akin and collectively appreciated as posterior column shortening osteotomies (PCOs). The former is considered a gentler osteotomy grade than the latter. The spine literature provides very little information on their comparison regarding perioperative complications and major curve correction rate outcomes.
PURPOSE: To determine whether Schwab-grade-I PCO (SPO) and Schwab-grade-II PCO (PO) are comparably safe in the surgical management of severe rigid scoliosis or kyphoscoliosis patients.
STUDY DESIGN/SETTING: Retrospective single-center comparative clinical study.
PATIENT SAMPLE: A total of 38 patients with severe rigid scoliosis or kyphoscoliosis were propensity score matched in this study, [SPO-treated]; n=21 (55.30%) and [PO-treated]; n=17 (44.70%), who underwent primary spinal deformity corrective surgery, respectively.
OUTCOME MEASURES: Outcomes included demographics, baseline pulmonary functional outcomes, perioperative complications incidence, hospital costs, Oswestry disability index (ODI), and scoliosis research society-22 (SRS-22) questionnaire scores.
METHODS: Following approval by the institutional review board (IRB) of Beijing Chaoyang Hospital-Affiliated Capital Medical University in Beijing, out of a total of 82 consecutive surgical patients with complete data demonstrating severe and/or rigid spinal deformity, a pool of 38/82 (46.3%) propensity-matched adults (≥18 years) with severe rigid scoliosis or kyphoscoliosis patients defined with a preoperative major curve magnitude of ≥80 degrees on anteroposterior plain radiographs, and flexibility of <25% on bending plain radiographs who underwent primary spinal deformity corrective surgery were retrospectively evaluated. The patients were dichotomized into two (2) osteotomy groups: standard (partial) facetectomy (SPO-treated), n=21 with an average age of 24.67 years, (i.e., Schwab-grade-I PCO) and complete facet excision, (PO-treated), (i.e., Schwab-grade-II PCO), n=17 with an average age of 23.12 years. The minimum follow-up period was 2 years. Primary outcomes included baseline and clinical features. Secondary outcomes included perioperative [intraoperative, immediate, and at 2-year postoperative] complication rates. Tertiary outcomes included perioperative ODI and SRS-22 scores. Statistical analyses were carried out by Student t-test and Pearson’s Chi-squared test (Fisher’s Exact Test), through Python statistical software package. Statistical significance was set at (p<0.05).
RESULTS: Of the 38 matched severe rigid scoliosis or kyphoscoliosis patients, 55.30% (n=21) were SPO-treated and 44.70% (n=17) were PO-treated patients, respectively. The overall average age of patients was 23.97 years, with a female incidence of 76.32%. Major curve correction rates were 49.19% and 57.40% in SPO-treated and PO-treated patients, respectively, (p>0.05). Immediately following surgery, comparable overall complication rates of 28.57% (n=6/21) vs 29.41% (n=5/17) were observed in the SPO-treated and PO-treated patients, respectively, (p=0.726). We observed incidences of 9.52%, (n=2/21) vs 5.88%, (n=1/17) for surgical intensive care unit (SICU) admission, and incidences of 4.76%, (n=1/21) vs 5.88%, (n=1/17) for cardiopulmonary events in SPO-treated versus PO-treated patients after surgery, respectively, (p>0.05). The incidences of neurological deficits in the SPO-treated and PO-treated patients were respectively, 14.29%, (n=3/21) vs 17.65%, (n=3/17) immediately following surgery, (p>0.05), and 0.00%, (n=0/21) in SPO-treated vs 14.28%, (n=3/21) in PO-treated patients at ≥2 years postoperative, (p<0.05). Among the 3 patients that reported neurological deficits in the PO-treated group at ≥2 years postoperative, 2 patients had preexisting baseline neurological deficits. The ODI score in the PO-treated group was significantly inferior at a minimum 2-year follow-up, (p<0.05).
CONCLUSIONS: In the current study, both SPO-treated and PO-treated patients demonstrated statistically comparable surgical complications immediately following corrective surgery. Severe rigid kyphoscoliosis patients with preexisting baseline neurological deficits were more inclined to sustain neurological morbidity following corrective surgery. PCO corrective techniques are warranted as safe options for treating patients with severe rigid spine deformity phenotypes.
PMID:37619870 | DOI:10.1016/j.spinee.2023.08.006