Minimally invasive retroperitoneal lymph node dissection for men with testis cancer: a retrospective cohort study of safety and feasibility.

PURPOSE: To describe the perioperative safety, functional and immediate post-operative oncological outcomes of minimally invasive RPLND (miRPLND) for testis cancer. METHODS: We performed a retrospective multi-centre cohort study on testis cancer patients treated with miRPLND from 16 institutions in eight countries. We measured clinician-reported outcomes stratified by indication. We performed logistic regression to identify predictors for maintained postoperative ejaculatory function. RESULTS: Data for 457 men undergoing miRPLND were studied. miRPLND comprised laparoscopic (n = 56) or robotic (n = 401) miRPLND. Indications included pre-chemotherapy in 305 and post-chemotherapy in 152 men. The median retroperitoneal mass size was 32 mm and operative time 270 min. Intraoperative complications occurred in 20 (4%) and postoperative complications in 26 (6%). In multivariable regression, nerve sparing, and template resection improved ejaculatory function significantly (template vs bilateral resection [odds ratio (OR) 19.4, 95% confidence interval (CI) 6.5-75.6], nerve sparing vs non-nerve sparing [OR 5.9, 95% CI 2.3-16.1]). In 91 men treated with primary RPLND, nerve sparing and template resection, normal postoperative ejaculation was reported in 96%. During a median follow-up of 33 months, relapse was detected in 39 (9%) of which one with port site (< 1%), one with peritoneal recurrence and 10 (2%) with retroperitoneum recurrences. CONCLUSION: The low proportion of complications or peritoneal recurrences and high proportion of men with normal postoperative ejaculatory function supports further miRPLND studies.

Vertebra Plana in Children May Result from Etiologies Other Than Eosinophilic Granuloma.

BACKGROUND: Vertebra plana in children is a diagnostic dilemma for orthopaedic surgeons. This radiographic finding sometimes has been said to be pathognomonic for eosinophilic granuloma (Langerhans cell histiocytosis); however, vertebra plana may also be caused by a range of other conditions. We sought to determine whether vertebra plana can be associated with malignancies other than eosinophilic granuloma. QUESTIONS/PURPOSES: (1) To report the underlying diagnoses for children with vertebra plana and determine how frequently these patients were found to have eosinophilic granuloma as opposed to an underlying malignant process, (2) to evaluate the occurrence of nondiagnostic results on biopsy, and (3) to determine whether the presenting characteristics of spinal lesions were associated with the ultimate clinical diagnosis. METHODS: As part of a retrospective review, our institutional electronic medical record was searched for all patients younger than 18 years between 1976 and 2017 whose clinical record included the term vertebra plana. Patients with trauma were excluded. Twenty-seven patients met the inclusion criteria (mean [range] age 9 years [0 to 18]; 12 girls). To address our first research purpose about the underlying diagnoses of patients with vertebra plana, we reviewed the final clinical diagnosis. To address our second research purpose about the utility of biopsy, we reviewed which patients underwent a biopsy and whether it had been diagnostic. To address our third research purpose about the radiographic criteria, we classified the radiographs and compared this to the clinical diagnosis. Vertebral collapse was described as less than 50% collapse, 50% to 100% collapse, symmetrical, and asymmetrical. The location of each lesion was noted. RESULTS: Twelve of 27 patients had a diagnosis of eosinophilic granuloma. Six of 27 had other neoplastic etiologies, including acute lymphoblastic leukemia, primary germ cell tumor, giant cell tumor, rhabdomyosarcoma and teratoma. Seventeen of 27 patients underwent biopsy to confirm the diagnosis; six biopsies were consistent with eosinophilic granuloma, six for other etiologies, and five were nondiagnostic. With the limited patient numbers available, there was no difference in the frequency of less than 50% loss of height or 50% to 100%, or symmetric and asymmetric loss of height, and location of the lesion among patients with eosinophilic granuloma and those with other diagnoses. CONCLUSIONS: Eosinophilic granuloma or Langerhans cell histiocytosis is a common cause of vertebra plana, but other causes must be considered in children presenting with this radiographic finding. Six of 27 of patients presenting to our center with vertebra plana had an underlying neoplasm other than eosinophilic granuloma. With the limited patient numbers available, pain, spinal location, and the degree and symmetry of collapse were not associated with a diagnosis of eosinophilic granuloma in this series. Thus, patients presenting with vertebral plana and back pain need a comprehensive work-up and potentially tissue biopsy to determine diagnosis and appropriate treatment. LEVEL OF EVIDENCE: Level IV, diagnostic study.

MicroRNA for Prediction of Teratoma and Viable Germ Cell Tumor after Chemotherapy.

MicroRNAs (miRNAs) are emerging as highly sensitive and specific markers for testicular germ cell tumors (GCTs) across the spectrum of disease. However, their utility in specific clinical scenarios requires further study. Here, we review the current evidence for miRNAs as tumor markers for the evaluation of treatment response in patients undergoing chemotherapy for the treatment of advanced testicular GCT.

Urine-Based Markers for Detection of Urothelial Cancer and for the Management of Non-muscle-Invasive Bladder Cancer.

Currently, evaluation for hematuria is driven by the AUA/SUFU guidelines, and urine markers are not recommended for routine evaluation. Bladder cancer is a disease characterized by a high recurrence rate that is impacted by stage and grade. The use of urine markers within the guidelines is recommended for very specific indications such as atypical cystoscopic findings or atypical cytologic findings. Routine use is also not recommended for patients undergoing surveillance. Many protein, DNA and RNA, and molecular biomarkers have been examined as an adjunct to cystoscopy and cytology in the diagnosis and surveillance of bladder cancer, and several FDA-approved tumor markers are now available. The role of biomarkers remains an important area of further study to enhance the diagnosis and surveillance of bladder cancer. Beyond this, tumor markers may also play an important role in risk stratification and prediction of treatment response, allowing for personalized care for patients with bladder cancer. This article reviews the urine biomarkers currently available in the diagnosis and surveillance of bladder cancer.

Robotic post-chemotherapy retroperitoneal lymph node dissection for testicular cancer: A multicenter collaborative study.

OBJECTIVES: To evaluate the perioperative and oncological/functional outcomes of robotic post-chemotherapy retroperitoneal lymph node dissection for testicular cancer. METHODS AND MATERIALS: In this retrospective study, we included patients who underwent robotic post-chemotherapy retroperitoneal lymph node dissection at 7 academic centers between 2011 and 2021. Patients' characteristics, perioperative findings, as well as oncological and functional outcomes are reviewed. Relationships with the main outcome (90-day complications) were analyzed using multivariable logistic regression. RESULTS: A total of 90 patients with a median (IQR) age of 30 (25-37) years were included. The main primary histologic type was non-seminomatous germ cell tumor (89%). Seven patients (8%) were electively converted to open. Median estimated blood loss, operative time, and length of hospital stay were 150 ml, 5.6 hours, and 2 days, respectively. Final pathology revealed teratoma in 49 (55%), necrosis/fibrosis in 29 (32%), and viable germ cell tumor in 12 (13%) patients. The 90-day complication rate was 16.7%, most of which were low-grade (Clavien-Dindo < III) and managed conservatively. On multivariable analysis, pure seminoma (odds ratio 17.4) and bilateral dissection template (odds ratio 4.2) were independently associated with 90-day complications. No 90-day hospital readmission was recorded. With a median (IQR) follow-up of 16 (4-32) months, 6 (6.7%) patients had disease recurrence and there was 1 cancer-related death. CONCLUSION: With appropriate patient selection at centers with expertise in testicular cancer and minimally invasive surgery, robotic post-chemotherapy retroperitoneal lymph node dissection appears safe and effective, although longer follow-up is warranted.

Pathologic fracture in metastatic kidney cancer: Identifying widening disparities and opportunity for quality improvement.

BACKGROUND: Management and palliation of pathologic fracture (PFx) secondary to metastatic prostate (mCaP) and renal cancer (mRCa) is hospital resource intensive. Using a national all-payer database, we assessed the burden of PFx secondary to mCaP and mRCa nationwide. Admission rates, mortality, surgical fixation rates, and risk factors for high-cost admissions for pathologic fractures were assessed METHODS: National Inpatient Sample was queried from 2013 to 2015 for mCaP and mRCa admissions. Hospitalization costs of PFx was assessed over time by cancer type. Hospitalization outcomes were stratified by cancer type. Multivariable logistic regression models were constructed to examine predictors of high-cost admission for PFx (>75th percentile). RESULTS: From 2013 to 2015, there were 21,466 and 6,334 admissions for mCaP and mRCa with bone metastasis, respectively. Proportion of admissions for PFx was greater in mRCa than mCaP (15.9% vs. 7.2%, P < 0.01). PFx secondary to mRCa was associated with longer length of stay, hospitalization cost, and greater rate of surgical fixation. Costs of admission for PFx increased by $4,005 dollars from 2013 to 2015 for mRCa (P = 0.03), but did not increase for mCaP (P = 0.5). On multivariable analysis, mRCa was associated with greater odds of PFx (OR:2.12, P < 0.01), and high-cost hospitalization for mRCa associated PFx (OR:1.37, P = 0.02). CONCLUSIONS: PFx secondary to mRCa represents a significant health care burden. mRCa was associated with greater odds of PFx compared to mCaP, as well as greater inpatient morbidity and cost. Formalized guidelines on screening and management of bone lesions in mRCa may be needed to mitigate this under-recognized health care burden.

The Impact of Race and Gender on 30-Day Urologic Surgery Complications.

OBJECTIVE: To assess the effect of race and gender on complications after urologic surgeries. MATERIALS AND METHODS: The American College of Surgeons' National Surgical Quality Improvement Program data was utilized for patients undergoing urologic surgeries. Patient demographics and comorbidities were analyzed. Postoperative complications occurring in a 30-day postoperative period were noted and classified per the Clavien-Dindo classification. RESULTS: From 2008-2018, 284,050 patients underwent urologic surgery. The majority were men (80%) and identified as non-Hispanic white (80%). Complications occurred in 12%, including 9% minor, 5% major, and mortality in 0.6%. Univariate analysis found female gender, non-Hispanic black and Native American race, and patient comorbidities (hypertension, diabetes, heart failure, lung disease, chronic kidney disease) to be associated with increased risk of complications. Female gender remained a significant predictor on multivariable logistic regression, and Hispanic race was found to be an independent negative predictor of postoperative complications, although these results did not appear clinically significant. On exclusion of gender-specific urologic surgeries, female gender was associated with higher likelihood of minor complications, but male gender was associated with higher likelihood of major complications or mortality. CONCLUSION: Race was not associated with postoperative complication rate. Patient comorbidities are associated with an increased risk of 30-day postoperative complications. Females were more likely to have minor and males were more likely to major complications. Optimizing patient comorbidities preoperatively is key to improving postoperative outcomes.

Performance characteristics of 18F-fluciclovine positron emission tomography/computed tomography prior to retroperitoneal lymph node dissection.

INTRODUCTION: We aimed to determine whether anti-1-amino-3-18F-fluorocyclobutane-1-carboxylic acid (18F-fluciclovine) positron emission tomography/computed tomography (PET/CT) can accurately detect residual non-seminomatous germ cell tumor (NSGCT) prior to retroperitoneal lymph node dissection (RPLND). There is no reliable way to differentiate between fibrosis/necrosis, teratoma, and viable germ cell tumor in patients receiving post-chemotherapy RPLND. Functional imaging, including 18F-fludeoxyglucose (18F-FDG) PET/CT, has been disappointing. Due to the need for better imaging modalities, our prospective, pilot study aims to investigate the accuracy of 18F-fluciclovine PET/CT in detecting residual tumor prior to RPLND. METHODS: From March 2018 to May 2019, 10 eligible patients underwent preoperative 18F-fluciclovine PET/CT prior to undergoing bilateral, full-template RPLND or excision of mass (for one re-do RPLND) in a prospective, phase 2 study. Correlation between 18F-fluciclovine PET/CT and RPLND pathology were evaluated on a per-patient level. RESULTS: A total of 10 patients (mean age 29±7.6 years) underwent 18F-fluciclovine PET/CT prior to surgery. Nine of 10 patients received chemotherapy prior to RPLND. Correlation between 18F-fluciclovine PET/CT and RPLND pathology was seen in 3/10 (30%) patients. Five of 10 patients (50%) with negative 18F-fluciclovine PET/CT were found to have residual disease/teratoma on RPLND. Compared to the reference standard of RPLND, 18F-fluciclovine PET/CT demonstrated 29% sensitivity and 33% specificity. No patients experienced any adverse events due to 18F-fluciclovine PET/CT. CONCLUSIONS: Despite a different mechanism of action from 18F-FDG, 18F-fluciclovine has low sensitivity and specificity for residual teratoma in the retroperitoneum.

Simple Nephrectomy in a Tertiary Care Safety Net Hospital-Patient Characteristics, Causes, Cost, and Renal Function Implications.

OBJECTIVE: To evaluate factors associated with simple nephrectomy at a safety net hospital with a diverse patient population and large catchment area. Simple nephrectomy is an underreported surgery. Performance of simple nephrectomy may represent a failure of management of underlying causes. METHODS: We performed a retrospective review of simple nephrectomies performed at a major urban safety net hospital from 2014 to 2019. Detailed demographic, surgical, and renal functional outcomes were abstracted. We assessed the medical and social factors leading to performance of simple nephrectomy and report contemporaneous perception of preventability of the simple nephrectomy by the surgeon. RESULTS: Eighty-five patients underwent simple nephrectomy during the study period; 55% were non-white, 77% were women, and the median age at time of surgery was 46 years. The most common medical factors contributing to simple nephrectomy were stone disease in 55.3%, followed by retained ureteral stent (30.6%) and stricture (30.6%). The most common social factors were lack of insurance (58.5%), substance abuse issues (32.3%), mental health issues (24.6%), and immigration status (18.5%). In 38.8% of cases, the provider felt the surgery was preventable if medical factors leading to simple nephrectomy were properly addressed. CONCLUSIONS: Simple nephrectomy is a common surgery in the safety net hospital setting. Both medical and sociologic factors can lead to simple nephrectomy, and awareness of these factors can lead efforts to mitigate them. This review has led to the implementation of strategies to minimize occurrences of retained stents in our patients.

Occurrence and Natural History of Thyroid Cancer in Patients with Cowden Syndrome.

INTRODUCTION: Cowden syndrome patients are at an increased risk of developing differentiated thyroid carcinoma (DTC). There are limited studies of thyroid cancer biology within this population. We aimed to describe the frequency and progression of DTC in this population. METHOD: We reviewed all patients with clinically or genetically confirmed Cowden syndrome treated at our institution between 1979 and 2017. Presentation, operative details, pathology, and adjuvant treatment for all thyroid diseases were analyzed. RESULTS: Forty-seven patients were identified. Thirty-seven received a clinical diagnosis while 10 tested positive on genetic testing for the PTEN gene. Average follow-up time was 10 years. Twenty-three patients underwent a total thyroidectomy. Nine patients were diagnosed with thyroid cancer, with a mean age of 28.5 years, 4 cases of the follicular variant of papillary thyroid cancer (PTC), 4 of PTC, and 1 of cystic PTC. One patient required an interval lateral neck dissection but no patients developed distant metastasis. Fourteen patients underwent thyroidectomy, 12 due to follicular adenoma, Hürthle cell adenoma, or multinodular goiter, 1 due to Graves' disease, and 1 who elected to undergo a prophylactic thyroidectomy. No mortality was associated with thyroid cancer in these patients. CONCLUSION: Patients with Cowden syndrome are at a significantly increased risk of developing DTC and have a younger age of onset. In this study, 20% of the patients with Cowden syndrome were diagnosed with DTC, but distant metastasis and overall mortality were absent. Clinical features were similar to those of sporadic DTC, proving that, apart from screening, Cowden syndrome-related DTC can be treated in similar fashion.

Predictors of cost for posterior spinal fusion in adolescent idiopathic scoliosis.

STUDY DESIGN: Single-center retrospective review of pediatric patients who underwent posterior spinal fusion for adolescent idiopathic scoliosis (AIS). OBJECTIVE: To determine what clinical and operative factors influence inflation-adjusted hospital costs of posterior spine fusion surgery for AIS. With rising healthcare costs and the advent of bundled payments, it is essential understand the predictors of costs for surgical procedures. We sought to determine the components of hospital costs for AIS posterior spine fusion surgery using standardized, inflation-adjusted, line-item costs for services and procedures. METHODS: The study population comprised 148 AIS patients who underwent spinal fusion surgery at a large tertiary care center between 2009 and 2016. Data on medical characteristics, curve type, curve magnitude, number of screws and the number of levels was collected through manual chart review of X-rays and medical records. Hospital costs from admission until discharge were retrieved from an institutional database that contained line-item details of all procedures and services billed during the hospital episode. Bottom-up microcosting valuation techniques were used to generate standardized inflation-adjusted estimates of costs and standard deviations in 2016 dollars. RESULTS: Mean cost of AIS surgery was $48,058 ± 9379. Physician fees averaged 15% of the total cost ($7045 ± 1732). Implant costs and surgical/anesthesia/surgeon's fees accounted for over 70% of the hospital costs. Mean number of screws was 16 ± 4.5, mean number of levels fused was 11.2 ± 2.2, and the mean implant density (screws per level fused) was 1.45 ± 0.35. On multivariate analysis, the number of screws per level fused, number of levels fused, curve magnitude and length of stay were all significantly associated with hospital costs (p < 0.01). CONCLUSIONS: Bundled payments for AIS surgery should include adjustments for number of levels fused and curve size. Areas for cost savings include further reduction in implant costs, shortening length of stay, and reducing intraoperative costs. LEVEL OF EVIDENCE: III.

Minimum 20-Year Health-Related Quality of Life and Surgical Rates After the Treatment of Adolescent Idiopathic Scoliosis.

STUDY DESIGN: Longitudinal cohort. OBJECTIVES: To determine the patient-reported functional outcomes and need for related surgical procedures in a US cohort of adolescent idiopathic scoliosis (AIS) patients with minimum 20-year follow-up. SUMMARY OF BACKGROUND DATA: There is limited information regarding the long-term outcomes of scoliosis treatment in the US population. METHODS: A novel population of patients who underwent pediatric treatment for AIS with minimum 20-year follow-up was identified. Search of a single-center diagnostic registry generated 337 patients who fulfilled the inclusion criteria (AIS, curve magnitude >35°, and childhood treatment with bracing, surgery, or observation from 1975 to 1992). Any additional spine surgery as well as EQ5D, ODI, SRS 22, SAQ were determined. A total of 180 patients were included (mean of 30-year follow-up, range 20-37). Childhood treatment entailed bracing (41 patients), surgery (103 patients), and observation (36 patients). RESULTS: During the study period, only 1 of the 41 bracing patients underwent additional scoliosis-related spine surgery, whereas 5 of the 36 patients in the observation cohort underwent scoliosis surgery as adults. Seven of 103 childhood surgical patients required additional revision surgery as adults. Fifteen patients (4 braced, 7 fusion, and 4 observed) underwent chest wall surgery as adults. SRS scores were around 10% worse compared to population-based controls, with the exception of SRS mental health scores, which were similar to controls. Overall, 5.6% of patients were on disability, with no difference between operative and nonoperative groups. CONCLUSION: We found a low rate of adult scoliosis surgery in the braced population, and a low rate of revision surgery at the 30-year follow-up in patients undergoing spine fusion for AIS between 1975 and 1992. No detected differences in patient-reported outcomes were found between the braced, surgical, and observed populations at a mean of 30 years' follow-up. LEVEL OF EVIDENCE: Level III, therapeutic.

The Effect of Expansion Thoracostomy on Spine Growth in Patients with Spinal Deformity and Fused Ribs Treated with Rib-Based Growing Constructs.

STUDY DESIGN: Retrospective review of prospective registries. OBJECTIVES: We hypothesized that patients with congenitally fused ribs who underwent thoracostomy upon implantation of rib-based distraction devices would achieve improved spine growth compared with those who did not undergo thoracostomy. SUMMARY OF BACKGROUND DATA: Patients with fused ribs may develop thoracic insufficiency syndrome. Treatment for severe early-onset spinal deformity with rib fusions often includes the placement of rib-based expansion devices with surgical division of the fused ribs (thoracostomy). The effect of thoracostomy on spinal growth has not been fully examined. METHODS: Two multicenter registries of primarily prospectively collected data were searched. Patients with fused ribs and implantation of a rib-based device were identified. A total of 151 patients with rib fusions treated with rib-based constructs and minimum two-year follow-up were included. Among those, 103 patients were treated with expansion thoracostomy at the time of implantation, whereas 48 patients received device implantation alone. We evaluated change in T1-T12 and T1-S1 height, coronal Cobb angle, kyphosis, and number of surgeries. Preoperative deformity was similar between the two groups. Only 19% of patient underwent final fusion, with similar numbers fused in each group. RESULTS: At latest follow-up, the expansion thoracostomy group had a greater total improvement in T1-S1 height (7.2 cm vs. 4.8 cm, p = .004). There was no difference between the two groups for change in spinal height at each lengthening procedure. Interestingly, thoracostomy patients also underwent more total surgeries (11.5 vs. 9.6, p = .031) and more lengthening procedures (8.3 vs. 6.6, p = .017) than the comparison group despite similar length of follow-up. CONCLUSIONS: Patients who underwent expansion thoracostomy at the time of rib expansion device implantation achieved greater improvement in T1-S1 height than those who underwent implantation of rib expansion device alone. Further work is needed to evaluate whether expansion thoracostomy impacts pulmonary function.

Spine Deformity With Fused Ribs Treated With Proximal Rib- Versus Spine-Based Growing Constructs.

STUDY DESIGN: Retrospective review of prospectively collected data. OBJECTIVE: To compare the use of spine-based versus rib-based implants for the treatment of early-onset scoliosis (EOS) in the setting of rib fusions. SUMMARY OF BACKGROUND DATA: Treatment for severe early-onset spinal deformity with rib fusions includes growing spine devices with proximal rib or spine anchors. The results of treatment, however, have not been compared between spine-based versus rib-based proximal anchors. METHODS: 169 patients with rib fusions treated with rib-based or spine-based constructs and minimum two-year follow-up were included. Sixteen patients were treated with proximal spine-based anchors and 153 with proximal rib-based devices (VEPTRs). Overall, 104 of the patients with rib-based fixation underwent thoracoplasty at the index surgery. We evaluated change in T1-T12 and T1-S1 height, coronal Cobb angle, kyphosis, and number of lengthening/revision surgeries. RESULTS: Kyphosis increased a mean of 7° in the rib-based group and decreased a mean of 20 degrees in the spine-based group (p = .002). Major Cobb angle decreased in both groups (p < .0001); however, the spine-based group had greater Cobb angle improvement (24 vs. 11 degrees, p = .04). From implant and lengthening of distraction devices, there was a mean 3.3-cm (22%) increase in T1-T12 height and a mean of 8.0 lengthenings in the rib-based group compared with a 5.7-cm increase and 6.3 lengthening surgeries in the spine-based group. Patients with rib-based constructs had a mean of 11 total procedures, whereas spine-based patients had a mean of 8. CONCLUSIONS: Patients underwent a mean of eight lengthening surgeries before final fusion or cessation of lengthening with a modest 2.3-cm increase in T1-T12 height. Compared with proximal rib anchors, proximal spine anchors controlled kyphosis and improved Cobb angle correction for early-onset scoliosis with rib fusions.

Intraoperative Computed Tomography-Guided Navigation for Pediatric Spine Patients Reduced Return to Operating Room for Screw Malposition Compared With Freehand/Fluoroscopic Techniques.

PURPOSE: Placement of pedicle screws can be performed using freehand/fluoroscopic technique or intraoperative computed tomography (CT)-guided navigation. We sought to compare screw malposition and return to operating room (OR) for pedicle screw malposition for screws placed with and without CT-guided navigation. METHODS: This study was a single-center retrospective comparative study. All patients younger than 18 years with minimum two-year follow-up who underwent pedicle screw instrumentation between 2009 and 2015 were included. Institutional review board approval was obtained and patient charts were reviewed for patient demographics and surgical outcomes. If available, incidental CTs following the index surgery were reviewed to assess screw position. RESULTS: A total of 217 patients underwent spinal instrumentation. Overall, 112 patients had pedicle screws placed using fluoroscopic guidance, whereas 105 patients had screws placed using low-dose intraoperative CT-guided navigation (O-arm; Medtronics). Of the total cohort, 107 (49.3%) patients had adolescent idiopathic scoliosis, and the remainder had neuromuscular, tumor, congenital, or other diagnoses. Patients in each group had a similar number of levels fused (fluoroscopic = 10.9 vs. CT navigation = 9.8, p = .06). There was no difference in total estimated blood loss (1,127 vs. 1,179 mL, p = .63) or in blood loss per level fused (133.7 vs. 146.6 mL, p = .47). Patients with screws placed using fluoroscopic guidance had a shorter total operative time (441 vs. 468 minutes, p = .04); however, there was no difference when controlling for number of levels fused (58.3 vs. 61.5 minutes/level, p = .63). Postoperative CTs were available in 51 patients representing 526 imaged screws, which showed a significantly higher rate of severely malpositioned (>4 mm) screws in the fluoroscopic group than the CT navigation group (3.3% vs. 1.0%, p = .027). There was a 3.6% rate of return to OR for pedicle screw malposition in the freehand/fluoroscopic group compared with 0% in the CT-guided navigation group (p = .048). Including patients with less than two-year follow-up (169 fluoroscopy, 220 CT guidance) also found higher rates of screw malposition (13.5% vs. 7.1%, p = .004), severe screw malposition (3.0% vs. 0.50%, p = .04), and return to OR due to screw malposition (2.4% vs. 0%, p = .02) in patients with screws placed using fluoroscopic guidance. CONCLUSION: Patients with pedicle screws placed with CT-guided navigation had a lower rate of severely malpositioned screws and unplanned returns to the OR. There was no significant difference in blood loss or operative time when controlling for number of levels fused. SIGNIFICANCE: In the era of health care "never-events," return to OR for screw malposition could certainly be deemed unacceptable. Use of intraoperative CT-guided navigation thus far eliminated return to OR for screw malposition in a complex cohort of pediatric spinal deformity patients, without measurable increase in operative time or blood loss.

Cumulative Anesthesia Exposure in Patients Treated for Early-Onset Scoliosis.

BACKGROUND: Early-onset scoliosis (EOS) is a potentially life-threatening condition that requires early intervention to prevent severe deformity and pulmonary compromise. Observational studies have demonstrated that children receiving multiple procedures requiring general anesthesia are at a higher risk for adverse neurocognitive outcomes. We sought to characterize anesthetic exposure in EOS patients and to determine risk factors for increased exposure. We hypothesized that patients treated for EOS were at risk of receiving large amounts of cumulative anesthesia in childhood because of the need for early intervention to preserve pulmonary function. We sought to determine which factors impacted the amount of anesthesia patients received over the course of treatment. METHODS: Records of all EOS patients treated at a tertiary referral center from 2000 to 2014 were reviewed. Patients with a minimum two-year follow-up, under age 10 at diagnosis, were included. Anesthesia was recorded in three categories: 1) orthopedic surgeries; 2) nonorthopedic surgeries; and 3) imaging/associated procedures. Diagnoses included congenital, idiopathic, neuromuscular, and syndromic scoliosis. Treatment groups were: observation, bracing, Mehta casting, growing spine, or fusion. RESULTS: Mean cumulative anesthesia time was 1606 minutes. Patients with neuromuscular (mean 2132 minutes, p = .006) or congenital scoliosis (1875 minutes, p < .001) received more anesthesia than those with idiopathic scoliosis (754 minutes). Patients treated by fusion (2036 minutes, p < .001) or growing spine (2855 minutes, p < .001) received more anesthesia than those treated by bracing. CONCLUSIONS: Disease severity, non-idiopathic diagnoses, and longer length of follow-up were associated with increased anesthesia. Patients who presented at earlier ages, and those treated by Mehta casting, were more likely to exceed three hours of anesthesia prior to age 3. LEVEL OF EVIDENCE: III.

Paper #8: Cumulative Anesthesia Exposure in Patients Treated for Early Onset Scoliosis.

Anesthesia time was collected for 72 consecutive patients with early onset scoliosis (EOS). Patients averaged 26.8 hours of anesthesia, of which 64% came from orthopedic procedures. 42% of patients received greater than 3 hours of cumulative anesthesia prior to age 3, exceeding the FDA's recommendation. Non-idiopathic diagnosis and treatment other than bracing were statistically significant risk factors for greater cumulative anesthesia exposure.