scholarly journals Complication Profile Associated With S1 Pedicle Subtraction Osteotomy Compared to Other Spinal Levels

Neurosurgery ◽  
2019 ◽  
Vol 66 (Supplement_1) ◽  
Author(s):  
Darryl Lau ◽  
Vedat Deviren ◽  
Christopher P Ames
Keyword(s):  
Complication Rate ◽  
Diastolic Heart Failure ◽  
Adult Spinal Deformity ◽  
Neurological Complication ◽  
Pedicle Subtraction Osteotomy ◽  
Senior Author ◽  
Complication Rates ◽  
Multicenter Studies ◽  
Complication Risk ◽  
Significant Difference

Abstract INTRODUCTION S1 pedicle subtraction osteotomy (PSO) is rarely indicated. Therefore, its complication profile is not well defined. This study compares complication rates following S1 PSO to PSO performed at other spinal levels. METHODS A retrospective study of a consecutive cohort of adult spinal deformity (ASD) patients who underwent thoracolumbar 3 column osteotomy (3CO) by the senior author from 2006 to 2018 was performed. Multivariate analysis was used to asses complication risk stratified by osteotomy level. RESULTS A total of 363 patients underwent 3CO: 54 lower thoracic, 305 lumbar, and 6 S1. The number of lumbar PSO by level are as fsollows: L1 (24), L2 (26), L3 (135), L4 (102), and L5 (16). The indications for S1 PSO in this series were: high grade spondylolisthesis (spondyloptosis) in 4 cases and sacral fracture in 2 cases. Overall complication rate was 27.5%. Surgical and neurologic complications occurred in 7.7% and 5.8% of cases, respectively. Complication rate by 3CO level are as follows: thoracic (31.5%), L1 (29.2%), L2 (34.6%), L3 (20.7%), L4 (32.4%), L5 (12.5%), and S1 (50.0%). Relative to the thoracic level, S1 PSO was independently associated higher complication with an increase odd ratio of 39.60 (CI 3.12-503.41, P = .005). For S1 PSO, surgical and neurological complication rate was 16.7% for both outcomes; there was no significant difference between the 3CO levels. Specific complications encountered was a case of atrial flutter causing diastolic heart failure, a case of anaphylactic transfusion reaction, and a case with L5 weakness requiring hematoma evacuation and reduction of correction. One patient (16.7%) required revision surgery secondary to pseudarthrosis. Mean follow-up was 35.7 mo. CONCLUSION S1 PSO is a formidable procedure and associated with significantly higher complication rates than PSO performed at other levels. However, the technique is feasible with experienced surgeons. Large multicenter studies are needed to investigate this further.

scholarly journals Admission and Acute Complication Rate for Outpatient Lumbar Microdiscectomy

2010 ◽  
Vol 37 (1) ◽  
pp. 49-53 ◽  
Author(s):  
Aria Fallah ◽  
Eric M. Massicotte ◽  
Michael G. Fehlings ◽  
Stephen J. Lewis ◽  
Yoga Raja Rampersaud ◽  
...  
Keyword(s):  
Complication Rate ◽  
Admission Rate ◽  
Complication Rates ◽  
Chi Square ◽  
Lumbar Microdiscectomy ◽  
Acute Complication ◽  
Admission Data ◽  
Improved Outcomes ◽  
Significant Difference ◽  
Revision Operations

Objective:Specialization is generally independently associated with improved outcomes for most types of surgery. This is the first study comparing the immediate success of outpatient lumbar microdiscectomy with respect to acute complication and conversion to inpatient rate. Long term pain relief is not examined in this study.Methods:Two separate prospective databases (one belonging to a neurosurgeon and brain tumor specialist, not specializing in spine (NS) and one belonging to four spine surgeons (SS)) were retrospectively reviewed. All acute complications as well as admission data of patients scheduled for outpatient lumbar microdiscectomy were extracted.Results:In total, 269 patients were in the NS group and 137 patients were in the SS group. The NS group averaged 24 cases per year while the SS group averaged 50 cases per year. Chi-square tests revealed no difference in acute complication rate [NS(6.7%), SS(7.3%)] (p>0.5) and admission rate [NS(4.1%), SS(5.8%)] (p=0.4) while the SS group had a significantly higher proportion of patients undergoing repeat microdiscectomy [NS(4.1%), SS(37.2%)] (p<0.0001). Excluding revision operations, there was no statistically significant difference in acute complication [NS(5.4%), SS(1.2%)] (p=0.09) and conversion to inpatient [NS(4.3%), SS(4.6%)] (p>0.5) rate. The combined acute complication and conversion to inpatient rate was 6.9% and 4.7% respectively.Conclusion:Based on this limited study, outpatient lumbar microdiscectomy can be apparently performed safely with similar immediate complication rates by both non-spine specialized neurosurgeons and spine surgeons, even though the trend favored the latter group for both outcome measures.

scholarly journals Endonasal endoscopic pituitary surgery in the elderly

2018 ◽  
Vol 128 (2) ◽  
pp. 429-436 ◽  
Author(s):  
Peter J. Wilson ◽  
Sacit B. Omay ◽  
Ashutosh Kacker ◽  
Vijay K. Anand ◽  
Theodore H. Schwartz
Keyword(s):  
Elderly Patients ◽  
Complication Rate ◽  
Pituitary Adenomas ◽  
Statistical Tests ◽  
The Elderly ◽  
Medical Complications ◽  
Tumor Diameter ◽  
Complication Rates ◽  
Pseudoaneurysm Formation ◽  
Significant Difference

OBJECTIVEPituitary adenomas are benign, slow-growing tumors that cause symptoms either through mass effect or hormone overproduction. The decision to operate on a healthy young person is relatively straightforward. In the elderly population, however, the risks of complications may increase, rendering the decision more complex. Few studies have documented the risks of surgery using the endonasal endoscopic approach in a large number of elderly patients. The purpose of this study was to audit a single center's data regarding outcomes of purely endoscopic endonasal transsphenoidal resection of pituitary adenomas in elderly patients and to compare them to the current literature.METHODSA retrospective review of a prospectively acquired database of all endonasal endoscopic surgeries done by the senior authors was queried for patients aged 60–69 years and for those aged 70 years or older. Demographic and radiographic preoperative data were reviewed. Outcomes with respect to extent of resection and complications were examined and compared with appropriate statistical tests.RESULTSA total of 135 patents were identified (81 aged 60–69 years and 54 aged 70 years or older [70+]). The average tumor diameter was slightly larger for the patients in the 70+ age group (mean [SD] 25.7 ± 9.2 mm) than for patients aged 60–69 years (23.1 ± 9.8 mm, p = 0.056). There was no significant difference in intraoperative blood loss (p > 0.99), length of stay (p = 0.22), or duration of follow-up (p = 0.21) between the 2 groups. There was a 7.4% complication rate in patients aged 60–69 years (3 nasal and 3 medical complications) and an 18.5% complication rate in patients older than 70 years (4 cranial, 3 nasal, 1 visual, and 2 medical complications; p = 0.05 overall and 0.013 for cranial complications). Cranial complications in the 70+ age category included 2 postoperative hematomas, 1 pseudoaneurysm formation, and 1 case of symptomatic subdural hygromas.CONCLUSIONSEndonasal endoscopic surgery in elderly patients is safe, but there is a graded increase in complication rates with increasing age. The decision to operate on an asymptomatic or mildly symptomatic patient in these age groups should take this increasing complication rate into account. The use of a lumbar drain or lumbar punctures should be weighed against the risk of subdural hematoma in patients with preexisting atrophy.

scholarly journals Comparison of perioperative complications following posterior column osteotomy versus posterior-based 3-column osteotomy for correction of rigid cervicothoracic deformity: a single-surgeon series of 95 consecutive cases

2020 ◽  
Vol 33 (3) ◽  
pp. 297-306
Author(s):  
Darryl Lau ◽  
Vedat Deviren ◽  
Rushikesh S. Joshi ◽  
Christopher P. Ames
Keyword(s):  
Risk Factor ◽  
Complication Rate ◽  
Surgical Complications ◽  
Deformity Correction ◽  
Neurological Deficits ◽  
Wedge Osteotomy ◽  
Medical Complication ◽  
Complication Rates ◽  
Cervical Deformity ◽  
Significant Difference

OBJECTIVEThe correction of severe cervicothoracic sagittal deformities can be very challenging and can be associated with significant morbidity. Often, soft-tissue releases and osteotomies are warranted to achieve the desired correction. There is a paucity of studies that examine the difference in morbidity and complication profiles for Smith-Petersen osteotomy (SPO) versus 3-column osteotomy (3CO) for cervical deformity correction.METHODSA retrospective comparison of complication profiles between posterior-based SPO (Ames grade 2 SPO) and 3CO (Ames grade 5 opening wedge osteotomy and Ames grade 6 closing wedge osteotomy) was performed by examining a single-surgeon experience from 2011 to 2018. Patients of interest were individuals who had a cervical sagittal vertical axis (cSVA) > 4 cm and/or cervical kyphosis > 20° and who underwent corrective surgery for cervical deformity. Multivariate analysis was utilized.RESULTSA total of 95 patients were included: 49 who underwent 3CO and 46 who underwent SPO. Twelve of the SPO patients underwent an anterior release procedure. The patients’ mean age was 63.2 years, and 60.0% of the patients were female. All preoperative radiographic parameters showed significant correction postoperatively: cSVA (6.2 cm vs 4.5 cm [preoperative vs postoperative values], p < 0.001), cervical lordosis (6.8° [kyphosis] vs −7.5°, p < 0.001), and T1 slope (40.9° and 35.2°, p = 0.026). The overall complication rate was 37.9%, and postoperative neurological deficits were seen in 16.8% of patients. The surgical and medical complication rates were 17.9% and 23.2%, respectively. Overall, complication rates were higher in patients who underwent 3CO compared to those who underwent SPO, but this was not statistically significant (total complication rate 42.9% vs 32.6%, p = 0.304; surgical complication rate 18.4% vs 10.9%, p = 0.303; and new neurological deficit rate 20.4% vs 13.0%, p = 0.338). Medical complication rates were similar between the two groups (22.4% [3CO] vs 23.9% [SPO], p = 0.866). Independent risk factors for surgical complications included male sex (OR 10.88, p = 0.014), cSVA > 8 cm (OR 10.36, p = 0.037), and kyphosis > 20° (OR 9.48, p = 0.005). Combined anterior-posterior surgery was independently associated with higher odds of medical complications (OR 10.30, p = 0.011), and preoperative kyphosis > 20° was an independent risk factor for neurological deficits (OR 2.08, p = 0.011).CONCLUSIONSThere was no significant difference in complication rates between 3CO and SPO for cervicothoracic deformity correction, but absolute surgical and neurological complication rates for 3CO were higher. A preoperative cSVA > 8 cm was a risk factor for surgical complications, and kyphosis > 20° was a risk factor for both surgical and neurological complications. Additional studies are warranted on this topic.

Anatomic Site-Specific Complication Rates for Central Venous Catheter Insertions

2018 ◽  
Vol 35 (9) ◽  
pp. 869-874 ◽  
Author(s):  
Jacob Bell ◽  
Munish Goyal ◽  
Sallie Long ◽  
Anagha Kumar ◽  
Joseph Friedrich ◽  
...  
Keyword(s):  
Central Venous Catheter ◽  
Complication Rate ◽  
Venous Catheter ◽  
Complication Rates ◽  
Central Venous ◽  
Site Specific ◽  
Mechanical Complications ◽  
Significant Difference ◽  
Insertion Techniques ◽  
Delayed Complications

Background: Central venous catheter (CVC) complication rates reflecting the application of modern insertion techniques to a clinically heterogeneous patient populations are needed to better understand procedural risk attributable to the 3 common anatomic insertion sites: internal jugular, subclavian, and femoral veins. We sought to define site-specific mechanical and duration-associated CVC complication rates across all hospital inpatients. Methods: A retrospective chart review was conducted over 9 months at Georgetown University Hospital and Washington Hospital Center. Peripherally inserted central catheters and tunneled or fluoroscopically placed CVC’s were excluded. Mechanical complications (retained guidewire, arterial injury, and pneumothorax) and duration-associated complications (deep vein thrombosis or pulmonary embolism, and central line-associated bloodstream infections) were identified. Results: In all, 1179 CVC insertions in 801 adult patients were analyzed. Approximately 32% of patients had multiple lines placed. Of 1179 CVCs, 73 total complications were recorded, giving a total rate of one or more complications occurring per CVC of 5.9%. There was no statistically significant difference between site-specific complications. A total of 19 mechanical complications were documented, with a 1.5% complication rate of one or more mechanical complications occurring. A total of 54 delayed complications were documented, with a 4.4% complication rate of 1 or more delayed complications occurring. There were no statistically significant differences between anatomic sites for either total mechanical or total delayed complications. Conclusions: These results suggest that site-specific CVC complication rates may be less common than previously reported. These data further inform on the safety of modern CVC insertion techniques across all patient populations and clinical settings.

scholarly journals Effect of Travel Time and Distance on Outcomes in Total Ankle Arthroplasty

2020 ◽  
Vol 5 (4) ◽  
pp. 2473011420S0015
Author(s):  
Kristin C. Caolo ◽  
Scott J. Ellis ◽  
Jonathan T. Deland ◽  
Constantine A. Demetracopoulos
Keyword(s):  
Travel Time ◽  
Complication Rate ◽  
High Volume ◽  
Total Ankle Arthroplasty ◽  
Complication Rates ◽  
Linear Regression Models ◽  
Ankle Arthroplasty ◽  
Significant Difference ◽  
Drive Time

Category: Ankle; Ankle Arthritis Introduction/Purpose: Surgeons who perform a higher volume of total ankle arthroplasty (TAA) are known to have decreased complication rates; evidence shows that low volume centers performing TAA have decreased survivorship when compared with high volume centers. Understanding differences in outcomes for patients traveling different distances for their TAA is important for future patients deciding where to travel for their surgery. No study has previously examined differences in outcomes of patients traveling different distances to a high volume center for their TAA. This study compares preoperative and postoperative PROMIS scores for patients undergoing total ankle arthroplasty who traveled less than and more than 50 miles for their TAA. We hypothesized that there would be no difference in outcome scores based on distance traveled or estimated drive time. Methods: This study is a single center retrospective review of 162 patients undergoing primary total ankle arthroplasty between January 2016 and December 2018. We collected the primary address as listed in the patient’s medical record and used the directions feature on Google Maps to estimate driving mileage and estimated driving time from the patient’s address to the hospital. To analyze the distance patients traveled, patients were divided into two groups: <50 miles traveled (n=91) and >50 miles traveled (n=71). To analyze the estimated drive time, patients were divided into two groups: <90 minutes (n=77), >90 minutes (n=85). We collected preoperative and most recent postoperative PROMIS scores for all patients. Differences in most recent post-operative PROMIS scores between distance groups and travel time groups were assessed using multivariable linear regression models, adjusting for the pre-operative score and follow-up time. Results: We found no significant difference in post-operative PROMIS scores between the two groups when analyzed for distance traveled or for estimated travel time after adjustment for pre-operative PROMIS score and follow-up time (Table 1). The average follow-up for all 162 patients was 1.49 years. Power analysis showed that with a sample size of 110 (55 in each group), we had 81% power to detect an effect size of 4. Patients saw an increase in their Physical Function scores and a decrease in their Pain Interference and Pain Intensity scores with postoperative scores better than population means (Table 1). Overall complication rate for the <50 miles group was 17.6%, 7.7% required surgery. The >50 miles group had an overall complication rate of 24.0%, 9.9% required surgery. Conclusion: Patients traveling further distances to a high volume orthopedic specialty hospital for their total ankle arthroplasty do not have different clinical outcomes than patients traveling shorter distances. This is particularly important for patients deciding where to have their total ankle arthroplasty surgery. Patients who travel further have the opportunity to be treated at a local academic center; however our results show that outcomes do not change when traveling further for total ankle arthroplasty. [Table: see text]

Estimating the Risk of Deep Brain Stimulation in the Modern Era: 2008 to 2020

2021 ◽  
Author(s):  
Eun Jeong Koh ◽  
Joshua L Golubovsky ◽  
Richard Rammo ◽  
Arbaz Momin ◽  
Benjamin Walter ◽  
...  
Keyword(s):  
Deep Brain Stimulation ◽  
Brain Stimulation ◽  
Complication Rate ◽  
Surgical Complication ◽  
Neurological Complication ◽  
The United States ◽  
Complication Rates ◽  
Systemic Complication ◽  
United States Food ◽  
Deep Brain

Abstract BACKGROUND Deep brain stimulation (DBS) was first approved by the United States Food and Drug Administration in 1997. Although the fundamentals of DBS remain the same, hardware, software, and imaging have evolved significantly. OBJECTIVE To test our hypothesis that the aggregate complication rate in the medical literature in the past 12 years would be lower than what is often cited based on early experience with DBS surgery. METHODS PubMed, PsycINFO, and EMBASE were queried for studies from 2008 to 2020 that included patients treated with DBS from 2007 to 2019. This yielded 34 articles that evaluated all complications of DBS surgery, totaling 2249 patients. RESULTS The overall complication rate in this study was 16.7% per patient. There was found to be a systemic complication rate of 0.89%, intracranial complication rate of 2.7%, neurological complication rate of 4.6%, hardware complication rate of 2.2%, and surgical site complication rate of 3.4%. The infection and erosion rate was 3.0%. CONCLUSION This review suggests that surgical complication rates have decreased since the first decade after DBS was first FDA approved. Understanding how to minimize complications from the inception of a technique should receive more attention.

scholarly journals Supratentorial and Infratentorial Approaches to Pineal Surgery: A Database Analysis

2018 ◽  
Vol 80 (04) ◽  
pp. 364-370
Author(s):  
David M. Rosenberg ◽  
Brett W. Geever ◽  
Akash S. Patel ◽  
Anisse N. Chaker ◽  
Abhiraj D. Bhimani ◽  
...  
Keyword(s):  
Pineal Gland ◽  
Clinical Decision Making ◽  
Tumor Resection ◽  
Postoperative Outcomes ◽  
Complication Rates ◽  
Database Analysis ◽  
Improvement Program ◽  
Multicenter Studies ◽  
Patient Demographics ◽  
Significant Difference

Objectives Neoplasms involving the pineal gland are rare. When they do occur, tumor resection is anatomically challenging and is traditionally addressed by either a supratentorial or an infratentorial approach. To date, no large, multicenter studies have been performed that systematically analyze outcomes comparing these two approaches. This study aimed to evaluate outcomes for patients undergoing pineal neoplasm resection, comparing supratentorial and infratentorial approaches. Design Retrospective database review. Setting Multi-institutional database. Participants From 2005 to 2016, 60 patients were identified, with 13 undergoing a supratentorial approach and 47 undergoing an infratentorial approach. Main Outcome Measures Patient demographics, comorbidities, and 30-day postoperative outcomes were investigated using the American College of Surgeons National Surgical Quality Improvement Program database. Demographics, readmission, reoperation, and complication rates were analyzed and compared with previous studies. Results Patient demographics were similar between these two groups. The overall complication rates for the supratentorial and infratentorial approaches were 30.8 and 17%, respectively, and the difference was not statistically significant. The most common medical complications encountered were respiratory and hematological. Conclusion As the first multi-institutional database analysis of approaches to the pineal gland, this study provides an analysis of patient demographics, comorbidities, and postoperative complications. After controlling for preoperative risk factors and demographic characteristics, no statistically significant differences in postoperative outcomes were found between infratentorial and supratentorial approaches. The mean readmission, reoperation, and complication rates were found to be 2.1, 8.3, and 20%, respectively. The lack of significant difference between approaches suggests that clinical decision-making should depend upon anatomical considerations and physician preference, although the complications illustrated here may provide some preoperative guidance.

scholarly journals Complications associated with the use of flow-diverting devices for cerebral aneurysms: a systematic review and meta-analysis

2017 ◽  
Vol 42 (6) ◽  
pp. E17 ◽  
Author(s):  
Geng Zhou ◽  
Ming Su ◽  
Yan-Ling Yin ◽  
Ming-Hua Li
Keyword(s):  
Mortality Rate ◽  
Complication Rate ◽  
Meta Analysis ◽  
Cerebral Aneurysms ◽  
Flow Diverter ◽  
Morbidity Rate ◽  
Complication Rates ◽  
Significant Difference ◽  
Neurological Morbidity ◽  
Electronic Database Search

OBJECTIVEThe objective of this study was to review the literature on the use of flow-diverting devices (FDDs) to treat intracranial aneurysms (IAs) and to investigate the safety and complications related to FDD treatment for IAs by performing a meta-analysis of published studies.METHODSA systematic electronic database search was conducted using the Springer, EBSCO, PubMed, Medline, and Cochrane databases on all accessible articles published up to January 2016, with no restriction on the publication year. Abstracts, full-text manuscripts, and the reference lists of retrieved articles were analyzed. Random-effects meta-analysis was used to pool the complication rates across studies.RESULTSSixty studies were included, which involved retrospectively collected data on 3125 patients. The use of FDDs was associated with an overall complication rate of 17.0% (95% confidence interval [CI] 13.6%–20.5%) and a low mortality rate of 2.8% (95% CI 1.2%–4.4%). The neurological morbidity rate was 4.5% (95% CI 3.2%–5.8%). No significant difference in the complication or mortality rate was observed between 2 commonly used devices (the Pipeline embolization device and the Silk flow-diverter device). A significantly higher overall complication rate was found in the case of ruptured IAs than in unruptured IA (odds ratio 2.3, 95% CI 1.2–4.3).CONCLUSIONSThe use of FDDs in the treatment of IAs yielded satisfactory results with regard to complications and the mortality rate. The risk of complications should be considered when deciding on treatment with FDDs. Further studies on the mechanism underlying the occurrence of adverse events are required.

scholarly journals Association between a prognostic nutritional index less than 50 and the risk of medical complications after adult spinal deformity surgery

2020 ◽  
Vol 33 (2) ◽  
pp. 219-224 ◽  
Author(s):  
Shin Oe ◽  
Yu Yamato ◽  
Tomohiko Hasegawa ◽  
Go Yoshida ◽  
Sho Kobayashi ◽  
...  
Keyword(s):  
Nutritional Status ◽  
Spinal Deformity ◽  
Adult Spinal Deformity ◽  
Multiple Logistic Regression Analysis ◽  
Significant Risk ◽  
Prognostic Nutritional Index ◽  
Medical Complications ◽  
Complication Rates ◽  
Nutritional Index ◽  
Significant Difference

OBJECTIVEMany complications are likely to occur in patients with malnutrition. The prognostic nutritional index (PNI) is often used when evaluating a patient’s nutritional condition. However, no studies have investigated the association between nutritional status and postoperative medical complications or prognosis by using the PNI in the field of spinal surgery. The purpose of this retrospective study was to investigate postoperative medical complications and prognoses of patients who had undergone adult spinal deformity (ASD) surgery, according to their preoperative nutritional status.METHODSAll patients aged ≥ 40 years who had undergone scheduled ASD surgery in the authors’ hospital between March 2010 and June 2017 were eligible for study inclusion and were divided into groups according to their PNI (< 50, group L; ≥ 50, group H). Medical complications diagnosed within 30 days postoperatively were evaluated; however, surgical site infection and death were evaluated until 1 and 5 years after surgery, respectively.RESULTSAmong the 285 eligible patients, groups L and H consisted of 118 and 167 patients, whose mean ages were 68.6 and 68.3 years, respectively. There was a significant difference in body mass index (22 vs 24 mg/kg2, respectively, p = 0.000), PNI (46 vs 55, p = 0.000), comorbidity of osteoporosis (50% vs 32%, p = 0.005) and autoimmune disease (13% vs 5%, p = 0.036), medical history of malignant disorder (17% vs 6%, p = 0.007), and medical complications (49% vs 23%, p = 0.000) between groups L and H. Multiple logistic regression analysis suggested that significant risk factors for postoperative medical complications were male sex (p = 0.000, OR 3.5, 95% CI 1.78–6.96), PNI < 50 (p = 0.000, OR 2.9, 95% CI 1.69–4.93), and days to ambulation (p = 0.003, OR 1.1, 95% CI 1.02–1.09).CONCLUSIONSMedical complication rates are significantly higher in patients with PNI < 50, those with delayed ambulation, and male patients. In malnourished patients scheduled for ASD surgery, improvement of preoperative nutritional status and postoperative early ambulation are important to avoid medical complications.

scholarly journals Radiographic outcome and complications after single-level lumbar extended pedicle subtraction osteotomy for fixed sagittal malalignment: a retrospective analysis of 55 adult spinal deformity patients with a minimum 2-year follow-up

2019 ◽  
Vol 30 (2) ◽  
pp. 242-252 ◽  
Author(s):  
Thomas J. Buell ◽  
James H. Nguyen ◽  
Marcus D. Mazur ◽  
Jeffrey P. Mullin ◽  
Juanita Garces ◽  
...  
Keyword(s):  
Spinal Deformity ◽  
Adult Spinal Deformity ◽  
Statistical Significance ◽  
Pedicle Subtraction Osteotomy ◽  
Complication Rates ◽  
Interbody Cage ◽  
Single Level ◽  
Sagittal Malalignment ◽  
Segmental Lordosis

OBJECTIVEFixed sagittal spinal malalignment is a common problem in adult spinal deformity (ASD). Various three-column osteotomy techniques, including the extended pedicle subtraction osteotomy (ePSO), may correct global and regional malalignment in this patient population. In contrast to the number of reports on traditional PSO (Schwab grade 3 osteotomy), there is limited literature on the outcomes of ePSO (Schwab grade 4 osteotomy) in ASD surgery. The objective of this retrospective study was to provide focused investigation of radiographic outcomes and complications of single-level lumbar ePSO for ASD patients with fixed sagittal malalignment.METHODSConsecutive ASD patients in whom sagittal malalignment had been treated with single-level lumbar ePSO at the authors’ institution between 2010 and 2015 were analyzed, and those with a minimum 2-year follow-up were included in the study. Radiographic analyses included assessments of segmental lordosis through the ePSO site (sagittal Cobb angle measured from the superior endplate of the vertebra above and inferior endplate of the vertebra below the ePSO), lumbar lordosis (LL), pelvic tilt (PT), pelvic incidence and LL mismatch, thoracic kyphosis (TK), and sagittal vertical axis (SVA) on standing long-cassette radiographs. Complications were analyzed for the entire group.RESULTSAmong 71 potentially eligible patients, 55 (77%) had a minimum 2-year follow-up and were included in the study. Overall, the average postoperative increases in ePSO segmental lordosis and overall LL were 41° ± 14° (range 7°–69°, p < 0.001) and 38° ± 11° (range 9°–58°, p < 0.001), respectively. The average SVA improvement was 13 ± 7 cm (range of correction: −33.6 to 3.4 cm, p < 0.001). These measurements were maintained when comparing early postoperative to last follow-up values, respectively (mean follow-up 52 months, range 26–97 months): ePSO segmental lordosis, 34° vs 33°, p = 0.270; LL, 47.3° vs 46.7°, p = 0.339; and SVA, 4 vs 5 cm, p = 0.330. Rod fracture (RF) at the ePSO site occurred in 18.2% (10/55) of patients, and pseudarthrosis (PA) at the ePSO site was confirmed by CT imaging or during rod revision surgery in 14.5% (8/55) of patients. Accessory supplemental rods across the ePSO site, a more recently employed technique, significantly reduced the occurrence of RF or PA on univariate (p = 0.004) and multivariable (OR 0.062, 95% CI 0.007–0.553, p = 0.013) analyses; this effect approached statistical significance on Kaplan-Meier analysis (p = 0.053, log-rank test). Interbody cage placement at the ePSO site resulted in greater ePSO segmental lordosis correction (45° vs 35°, p = 0.007) without significant change in RF or PA (p = 0.304). Transient and persistent motor deficits occurred in 14.5% (8/55) and 1.8% (1/55) of patients, respectively.CONCLUSIONSExtended PSO is an effective technique to correct fixed sagittal malalignment for ASD. In comparison to traditional PSO techniques, ePSO may allow greater focal correction with comparable complication rates, especially with interbody cage placement at the ePSO site and the use of accessory supplemental rods.

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