Search

Study Design: Retrospective study.Objective: To compare syrinx characteristics, scoliotic parameters, and neurological deficits between Chiari I malformation (CIM) and idiopathic syringomyelia (IS) in the scoliotic population.Summary Of Background Data: CIM and IS are common in neuromuscular scoliosis patients; however, differences in syrinx characteristics, scoliotic parameters, and neurological deficits between CIM and IS are unclear.Methods: Thirty-six patients with scoliosis secondary to CIM were enrolled retrospectively and matched with 36 IS patients for sex, age, scoliosis classification, and Cobb angle. Information on radiographic features of scoliosis and syrinx and neurological deficits was systematically collected.Results: Sex, age, and coronal, and sagittal scoliosis parameters did not differ between the CIM and IS groups. The CIM group had a longer syrinx (12.9 ± 4.0 vertebral levels vs. 8.7 ± 5.5 vertebral levels, P < 0.001), a higher cranial extent (3.6 ± 2.2 vs. 5.2 ± 3.5, P = 0.027), and a lower caudal extent (15.6 ± 2.9 vs. 13.0 ± 4.6, P = 0.006) than the IS group, despite no differences in syrinx/cord (S/C) ratio or syrinx classification. No differences in neurological deficits were identified between the CIM and IS patients.Conclusion: With demographic and scoliotic coronal parameters matched, the CIM patients had a longer syrinx, located at a higher cranial and lower caudal level, compared with the IS group. No significant differences in syrinx S/C ratio, sagittal features of scoliosis, or neurological deficits were detected between the two groups.Level Of Evidence: 3. [ABSTRACT FROM AUTHOR]

Background: The natural history of split spinal cord malformation (SCM) is still unclear. Knowledge of the characteristics of the osseous spur and its relationship with the spinal deformity may allow early identification of patients with a higher risk of a neurological deficit and enhance surgical decision-making.Methods: Eighty-five consecutive patients with congenital scoliosis and type-I SCM who had undergone surgical treatment at our hospital from May 2000 to December 2013 were identified retrospectively. There were 22 male and 63 female patients with an average age of 13.9 years at the time of surgery. Preoperative clinical and radiographic data were collected to investigate the characteristics of the scoliosis and the osseous spur. Two groups were identified on the basis of whether the patients had intact neurological function (Group A) or a neurological deficit (Group B).Results: There were 52 patients (61%) in Group A (intact neurological function) and 33 patients (39%) in Group B (neurological deficit). There were no significant differences in the demographic distribution, curve magnitude, or length and thickness of the osseous spur between the 2 groups. In Group A, the location of the osseous spur relative to the apex of the major curve was proximal in 13 patients (25%), distal in 28 (54%), and central in 11 (21%). In Group B, the osseous spur was proximal in 7 (21%), distal in 8 (24%), and central in 18 (55%). The 2 groups differed significantly with respect to the location of the osseous spur (chi square = 10.898, p = 0.004). Group-B patients had a higher proportion of patients with kyphotic deformity (42%) than Group A (10%). The ratio of the diameters of the hemicords (concave side divided by convex side) differed significantly between the 2 groups (0.98 for Group A versus 0.89 for Group B, p = 0.030).Conclusions: The neurological status in patients with congenital scoliosis and type-I SCM appears to be closely related to the location of the osseous spur relative to the congenital scoliosis. An osseous spur at the apex of the scoliosis may be related to a higher risk of developing a neurological deficit, especially in patients with kyphotic deformity. Asymmetric splitting of the spinal cord may contribute to neurological deficits.Level Of Evidence: Prognostic Level III. See Instructions for Authors for a complete description of levels of evidence. [ABSTRACT FROM AUTHOR]

Study Design: A retrospective study.Objective: To compare the clinical outcomes of different surgical strategy for patients with congenital scoliosis (CS) and type I split cord malformation (SCM).Summary Of Background Data: CS associated with type I SCM is a challenge for spine surgeon because of the high potential rate of neurological compromise. Traditionally, bony spur resection (BR) has been indicated before any procedure for scoliosis correction.Methods: From May 2002 to February 2013, 82 CS patients with type I SCM who underwent corrective surgery at our center were retrospectively reviewed. There were 20 male and 62 female patients with an average age of 13.8 years (4-39 yrs) at surgery. They were divided into two groups according to different surgical strategy. The patients in the BR group underwent staged prophylactic neurosurgery or one-stage BR before corrective surgery, whereas patients in the nonresection (NR) group underwent one-stage corrective surgery without addressing bony spur.Results: There were 15 patients in the BR group and 67 patients in the NR group. No significant differences were detected in preoperative characteristics between two groups. The average follow up was 37 months (24-105 months). In the BR group, the correction rate was 53.0% and 45.9% at the final follow up. Whereas, in the NR group, the correction rate was 48.5% and 42.1% at the final follow up. Compared with the NR group, the operation time and blood loss were statistically higher in the BR group. Five patients experienced transient neurological complications and one patient in the BR group suffered permanent neurological damage of incomplete loss bladder control.Conclusion: One-stage corrective surgery could be safe and effective for patients with CS and SCM. For patients with intact or stable neurological status, prophylactic neurosurgical intervention to remove bony spur before curve correction may not be necessary.Level Of Evidence: 4. [ABSTRACT FROM AUTHOR]

Background: The treatment of congenital scoliosis associated with split cord malformation (SCM) raises the issue of how to best manage such patients to avoid neurological deficit while achieving a satisfactory correction.Methods: This prospective clinical study was performed at our center from March 2000 through June 2013. We enrolled a total of 214 patients (61 male and 153 female) with congenital scoliosis associated with SCM who were undergoing spinal correction surgery. The mean age at surgery was 14.1 years. The inclusion criteria were congenital scoliosis with confirmed SCM; status as neurologically intact or stable over the preceding 2 years; and no neurological deterioration as evidenced on traction, side-bending, or fulcrum-bending radiographs. Patients with unstable neurological status or for whom vertebral column resection surgery was planned were excluded. All patients underwent scoliosis surgery without prophylactic detethering.Results: On the basis of the Pang classification, 73 patients were in the type-I SCM group, and 141 were in the type-II SCM group. The groups did not differ significantly with respect to preoperative characteristics, operative time, blood loss, or number of levels fused. The mean follow-up was 37 months (range, 24 to 108 months). The rate of scoliosis correction was lower in the type-I group than in the type-II group (p < 0.05). In the type-I group, the correction rate was 48.9% at 1 week postoperatively and 42.2% at the last follow-up. In the type-II group, the correction rate was 54.7% at 1 week postoperatively and 47.9% at the last follow-up. Eleven (5.1%) of the patients experienced transient neurological complications, with no significant difference between the groups (p = 0.415). No patient experienced permanent neurological deficit during surgery or follow-up.Conclusions: Patients with congenital scoliosis associated with SCM, regardless of type, can safely and effectively undergo spinal deformity correction and achieve spinal balance without neurological intervention. For such patients with intact or stable neurological status, prophylactic detethering prior to scoliosis surgery may not be necessary.Level Of Evidence: Therapeutic Level II. See Instructions for Authors for a complete description of levels of evidence. [ABSTRACT FROM AUTHOR]

Study Design. Retrospective study of a series of 226 consecutive Chinese patients with congenital scoliosis. Objective. To identify the incidence of intraspina] abnormalities and other organ defects in surgical patients with congenital scoliosis in Chinese population. Summary of Background Data. Previous studies have revealed high rates of intraspinal anomalies and other organ defects in patients with congenital scoliosis. The incidence of abnormalities in patients with congenital scoliosis in Chinese population has not been reported. Methods. A total of 226 patients with congenital scoliosis underwent surgical treatment in Peking Union Medical College Hospital between January 2005 and March 2011 were identified. A definitive diagnosis of congenital scoliosis for all patients was made. Complete data were reviewed, including medical records, plain radiograph, magnetic resonance (MR) image of the whole spine, echocardiography, and renal ultrasound. The incidence of intraspinal abnormalities and other organ defects were analyzed. Results. Intraspina[ abnormalities were found in 99 (43%) patients. Diastematomydia was identified to be the most common intraspinal pathological anomaly, which was different from the previous reports. The incidence of intraspinal anomaly in patients with failures of segmentation and mixed defects were significantly higher than those with failures of formation. Patients with thoracic hemivertebrae were found to have a higher incidence of intraspinal abnormalities than patients with lumbar hemivertebrae. Patients with intraspinal abnormality had a higher incidence of positive clinical findings than those with normal magnetic resonance imaging. However, the difference between the 2 groups was not statistically significant. Other organic defects were found in 91(40%) patients. Cardiac defects were detected in 18%, urogenital anomalies in 12%, and gastrointestinal anomalies in 5% of the patients in this study. Conclusion. Diastematomyelia was found to be the most common intraspinal pathological anomaly and cardiac defects were the most common extraspinal anomaly in surgical patients with congenital scoliosis in this study. Magnetic resonance imaging, echocardiography, and ultrasound should be part of routine evaluation in all congenital cases before surgery, no matter positive clinical findings were found or not. [ABSTRACT FROM AUTHOR]

Most cases of congenital spinal deformities were sporadic and without strong evidence of heritability. The etiology of congenital spinal deformities is still elusive and assumed to be multi-factorial. The current study seeks to elucidate the effect of maternal vitamin A deficiency and the production of congenital spinal deformities in the offsping. Thirty two female rats were randomized into two groups: control group, which was fed a normal diet; vitamin A deficient group, which were given vitamin A-deficient diet from at least 2 weeks before mating till delivery. Three random neonatal rats from each group were killed the next day of parturition. Female rats were fed an AIN-93G diet sufficient in vitamin A to feed the rest of neonates for two weeks until euthanasia. Serum levels of vitamin A were assessed in the adult and filial rats. Anteroposterior (AP) spine radiographs were obtained at week 2 after delivery to evaluate the presence of the skeletal abnormalities especially of spinal deformities. Liver and vertebral body expression of retinaldehyde dehydrogenase (RALDHs) and RARs mRNA was assessed by reverse transcription-real time PCR. VAD neonates displayed many skeletal malformations in the cervical, thoracic, the pelvic and sacral and limbs regions. The incidence of congenital scoliosis was 13.79% (8/58) in the filial rats of vitamin A deficiency group and 0% in the control group. Furthermore, vitamin A deficiency negatively regulate the liver and verterbral body mRNA levels of RALDH1, RALDH2, RALDH3, RAR-α, RAR-β and RAR-γ. Vitamin A deficiency in pregnancy may induce congenital spinal deformities in the postnatal rats. The decreases of RALDHs and RARs mRNA expression induced by vitamin A deprivation suggest that vertebral birth defects may be caused by a defect in RA signaling pathway during somitogenesis. [ABSTRACT FROM AUTHOR]

STUDY DESIGN.: A randomized prospective study.OBJECTIVE.: To compare safety, efficacy, and cost between 1-stage and 2-stage anterior and posterior spinal fusion in treating rigid thoracic adolescent idiopathic scoliosis (AIS).SUMMARY OF BACKGROUND DATA.: Retrospective study issued different outcomes comparing 1-stage with 2-stage surgical procedures in treating neuromuscular and congenital scoliosis. A randomized prospective study in AIS has rarely been reported.METHODS.: Twenty-four patients were randomly divided into 2 groups. Group A underwent a 2-stage procedure, group B a 1-stage procedure. Inclusion criteria were: (1) AIS; (2) rigid single thoracic curve, ≥90° on anteroposterior and ≥60° on side bending view; and (3) pulmonary function tests, vital capacity ≥500 mL or FEV1 ≥50%. Exclusion criteria were: (1) curves either <90° on anteroposterior or <60° on bending view; and (2) pulmonary function tests, both vital capacity <500 mL and FEV1 <50%. The mean follow up was 3.3 years (range 2–5.1). Clinical outcomes between the 2 groups were analyzed.RESULTS.: A statistical t test demonstrated no significant difference in age (P = 0.299), curves on anteroposterior (P = 0.908), on bending (P = 0.905), after surgery (P = 0.699), and at last follow-up (P = 0.946). No significant difference in blood loss (P = 0.089), transfusion (P = 0.334), operation time (P = 0.172), fusion segments anterior (P = 0.161), posterior (P = 0.546), wound drainage (P = 0.557), thoraco drainage (P = 0.948), and loss of correction at follow-up (P = 0.596). However, significant differences were found in length of stay (P < 0.001), patient cost of hospitalization (P < 0.001) between 2 groups, and curve correction (P < 0.001) in each group. Perioperative complications included 1 patient each with pneumonia, pneumothorax (group A), and ileus (group B). Screw nut loosing was found in 1 patient in group B, but no curve deteriorated. No neurologic deficit occurred in either group.CONCLUSION.: A comparison of 1-stage versus 2-stage fusion in treating rigid thoracic curves in AIS did not show significant differences in safety or efficacy but did demonstrate significant difference in length of stay and patient cost. [ABSTRACT FROM AUTHOR]

Background: Congenital early-onset scoliosis (CEOS) is characterized by a spectrum of vertebral anomalies, including formation failures and segmentation failures at the apex segment, which makes CEOS different from other etiologies of earlyonset scoliosis. To date, studies on patients who have graduated from CEOS treatment using traditional dual growing rods (TDGR) have been scarce, and the preliminary results of TDGR with or without the apical control technique (ACT) have varied. We therefore compared the final outcomes of patients with CEOS who graduated from TDGR with or without the ACT. Methods: A retrospective study of patients with CEOS who had graduated from TDGR treatment performed from 2007 to 2020 was conducted. Graduation included final fusion or observation after reaching skeletal maturity. Patients were divided into the ACT-TDGR group (apical vertebrectomy and/or hemivertebrectomy with short fusion and TDGR) and the TDGR-only group. Demographic characteristics, radiographic data, patient-reported clinical outcomes, pulmonary function, and complications were analyzed. Results: A total of 41 patients with CEOS were enrolled: 13 in the ACT-TDGR group and 28 in the TDGR-only group. The lengthening intervals were longer in the ACT-TDGR group (mean [and standard deviation], 1.26 ± 0.66 years) than in the TDGR-only group (0.80 ± 0.27 years). The preoperative main curve was larger in the ACT-TDGR group (80.53° ± 19.50°) than in the TDGR-only group (64.11° ± 17.50°). The residual curve was comparable between groups (26.31° ± 12.82° in the ACT-TDGR group compared with 27.76° ± 15.0° in the TDGR group) at the latest follow-up. The changes in apical vertebral rotation and thoracic rotation were significantly larger in the ACT-TDGR group. Patients had comparable T1-12 and T1-S1 heights, pulmonary function, and 22-item Scoliosis Research Society (SRS-22) scores at the latest follow-up. The mean number of mechanical-related complications per patient was lower in the ACT-TDGR group (0.77 ± 0.73) than in the TDGR-only group (1.54 ± 1.43). Seventeen patients underwent final fusion. Conclusions: In this small-scale study, we observed that both ACT-TDGR and TDGR-only could correct the deformity while allowing for spinal growth in patients with CEOS. ACT-TDGR yielded better correction in severe cases and did not have a deleterious effect on spinal height. A large number of cases will be needed to validate the clinical value of the ACT. Level of Evidence: Therapeutic Level III. See Instructions for Authors for a complete description of levels of evidence. [ABSTRACT FROM AUTHOR]

Background: Both patients with Chiari-I malformation (CIM) with syringomyelia and those with idiopathic syringomyelia (ISm) have a syrinx and can have scoliosis as well. However, there is no literature regarding differences between CIM and ISm in terms of radiographic outcomes and surgical complications after posterior fusion, to our knowledge. The aim of the present study was to compare radiographic features, clinical outcomes, and surgical complications after posterior spinal fusion between patients with CIM-associated scoliosis and those with ISm-associated scoliosis.Methods: One hundred and twenty patients with syringomyelia-associated scoliosis were retrospectively analyzed. Twenty-one patients with scoliosis secondary to CIM were enrolled and matched by sex, age, and the Cobb angle of the scoliotic curve with 21 patients with scoliosis secondary to ISm. All patients underwent 1-stage posterior fusion surgery. Coronal and sagittal radiographic parameters were evaluated before surgery, immediately after surgery, and at the final follow-up (at least 2 years). We also collected data regarding syringeal features, neurological deficits, intraoperative neuromonitoring, and complications.Results: Sex, age, preoperative coronal/sagittal scoliosis parameters, and neurological deficits were similar between the matched CIM and ISm groups. On average, the CIM group had a longer syrinx (12.3 ± 3.6 versus 8.9 ± 4.5 vertebral levels, p = 0.010) than the ISm group. The CIM and ISm groups showed similar correction rates for primary curves (70.9% ± 10.6% versus 69.5% ± 16.3%, p = 0.739). There were no significant differences in coronal/sagittal correction, intraoperative neuromonitoring abnormalities, surgical complications, or Scoliosis Research Society-22 questionnaire scores between the 2 groups.Conclusions: Despite matched demographic and scoliotic coronal parameters, patients with CIM had longer syrinxes compared with patients with ISm. One-stage posterior fusion achieved comparable clinical and radiographic outcomes for both CIM- and ISm-associated scoliosis without significant differences in neurological complications.Level Of Evidence: Prognostic Level III. See Instructions for Authors for a complete description of levels of evidence. [ABSTRACT FROM AUTHOR]

Study Design: A prospective study.Objective: To investigate the incidence and risk factors of acute pancreatitis after scoliosis surgery.Summary Of Background Data: Pancreatitis has been recognized as a possible complication of extra-abdominal surgeries. However, there were few reports on the incidence and risk factors of acute pancreatitis after scoliosis surgery.Methods: A prospective clinical study was performed at our center from September 2014 to October 2015. One hundred seventy-six patients undergoing posterior spinal correction surgery were enrolled. The diagnosis of acute pancreatitis was based on their clinical manifestations combined with laboratory examination. Demographic, intraoperative, and radiological parameters were evaluated to identify the risk factors of acute pancreatitis after scoliosis surgery.Results: Thirteen patients (7.4%) were diagnosed with acute pancreatitis. Compared with patients without pancreatitis, pancreatitis patients had lower body mass index (BMI) (15.5 vs. 19.5, P = 0.001), larger preoperative Cobb angle of major curve (87.5° vs. 59.2°, P < 0.001), lower correction rate (57.4% vs. 69.0%, P = 0.045), lower intraoperative mean arterial pressure (57.9 mmHg vs. 66.1 mmHg, P < 0.001), and longer fusion levels (13.3 vs. 10.1, P < 0.001). No significant differences were noted with respect to operation time, intraoperative blood loss, or the amount of sagittal profile correction. Furthermore, multivariate logistic analysis revealed that BMI (odds ratio [OR] = 1.542, P = 0.009), lowest intraoperative mean arterial pressure (OR = 1.126, P = 0.039), and segments of fusion (OR = 0.551, P = 0.025) were independent risk factors for postoperative acute pancreatitis. All cases were treated with bowel rest, intravenous fluids, and fasting and completely recovered with 3.3 (2-5) days.Conclusion: The incidence of postoperative acute pancreatitis after scoliosis surgery was 7.4%. The low BMI, lowest intraoperative mean arterial pressure, and long segments of fusion were independent risk factors for acute pancreatitis after scoliosis surgery.Level Of Evidence: 3. [ABSTRACT FROM AUTHOR]

Background: Vertebrae, ribs, and spinal cord are anatomically adjacent structures, and their close relationships are clinically important for planning better corrective surgical approach. The objective is to identify the radiographic characteristics in surgical patients with congenital scoliosis (CS) and coexisting split cord malformation (SCM).Methods: A total of 266 patients with CS and SCM underwent surgical treatment at our hospital between May 2000 and December 2015 was retrospectively identified. The demographic distribution and radiographic data were collected to investigate the characteristics of spine curve, vertebral, rib, and intraspinal anomalies. According to Pang's classification, all patients were divided into two groups: type I group is defined as two hemicords, each within a separate dural tube separated by a bony or cartilaginous medial spur, while type II group is defined as two hemicords within a single dural tube separated by a nonrigid fibrous septum.Results: There were 104 patients (39.1%) in Type I group and 162 patients (60.9%) in Type II group. SCM was most commonly found in the lower thoracic and lumbar regions. The mean length of the septum in Type I SCM was significantly shorter than Type II SCM (2.7 vs. 5.2 segments). Patients in Type I group had a higher proportion of kyphotic deformity (22.1%). The vertebral deformities were simple in only 16.5% and multiple in 83.5% of 266 cases. Patients in Type I group presented higher prevalence of multiple (90.4%) and extensive (5.1 segments) malformation of vertebrae. In addition, hypertrophic lamina and bulbous spinous processes were more frequent in Type I group (29.7%), even developing into the "volcano-shape" deformities. Rib anomalies occurred in 62.8% of all patients and 46.1% of them were complex anomalies. The overall prevalence of other intraspinal anomalies was 42.9%. The most common coexisting intraspinal anomalies was syringomyelia (30.5%).Conclusion: The current study, with the largest cohort to date, demonstrated that patients with CS and coexisting SCM presented high prevalence of multiple vertebral deformities, rib and intraspinal anomalies. The length of the split segment in Type I SCM was shorter than that in Type II SCM. Compared with Type II SCM, patients with Type I SCM presented with higher incidence of kyphotic deformity, more extensive and complicated vertebral anomalies, and more complex rib anomalies. [ABSTRACT FROM AUTHOR]

Study Design: A case-control association study was performed to investigate the relationship between ladybird homeobox (LBX1) and adolescent idiopathic scoliosis (AIS) in northern Chinese Han population.Objective: To explore the prevalence and functional importance of LBX1 polymorphisms in patients with AIS within the northern Chinese Han population.Summary Of Background Data: AIS is the most common subtype of idiopathic scoliosis. Genetic factors such as LBX1 polymorphisms have been recently proved to be associated with AIS in some populations. In this study we explored the prevalence and functional importance of the polymorphisms around LBX1 in patients with AIS within the northern Chinese Han population.Methods: Five tag single nucleotide polymorphisms (SNPs) around or in LBX1 were genotyped in 180 patients with AIS and 182 controls. And the luciferase assay was performed to explore the functional importance of the most significant SNPs.Results: We replicated that rs11190870, previously reported as the most significantly associated SNP, was enriched in our AIS cohort. In addition, we found that the T allele of rs1322331 was associated with a novel risk allele (odds ratio = 3.349, 95% confidence interval 1.742-6.436). In the following luciferase assay, the TT-type promoter showed significantly reduced transcription activity in vitro.Conclusion: Two SNPs around LBX1, rs11190870 and rs1322331 are associated with AIS in northern Chinese Han population. The T allele of rs1322331 is a novel risk allele. We hypothesize that rs1322331 might increase patients' susceptibility to AIS by reducing LBX1-AS1 transcription and thus upregulating the function of LBX1.Level Of Evidence: 3. [ABSTRACT FROM AUTHOR]

Background: The X-ray films of the patients with Marfan syndrome scoliosis (MSS) look like those with adolescent idiopathic scoliosis (AIS). In literature, there are many reports on the correction results of AIS, while there are a few studies focused on the difference of the correction results between MSS and AIS. This study aims to analyze whether there are differences of posterior correction surgery in MSS and AIS. Methods: All the patients included underwent posterior correction surgery. The radiographic data, operation duration, estimated blood loss, transfusion, fusion levels, and correction rate were retrospectively reviewed and analyzed between the two groups. Results: Group MSS included 42 patients, 11 male and 31 female, with an average age of 15.2 years old. Group AIS included 168 patients (ratio, 1:4), 34 male and 134 female, with an average age of 14.5 years old. Twenty-three patients in group MSS and 94 patients in group AIS were followed up regularly, with an average time of 18.4 and 18.5 months, respectively. The mean coronal Cobb angle of the major curve before operation and at final follow-up, the correction rate, fusion level, operation duration, estimated blood loss during operation, and transfusion between the two groups were 60.4 and 57.5°, 14.6 and 15.2°, 76.4 and 74.1 %, 11.5 and 11.0 vertebrae, 4.6 and 4.0 h, 845 and 698 ml, and 1151 and 894 ml, respectively. The age, gender ratio, curve type, and coronal Cobb angle of the major curve were all matched (all P > 0.05). Group MSS had a longer operation duration and more estimated blood loss compared with those of group AIS (both P < 0.05), while there was no significant difference in terms of fusion level, transfusion, coronal Cobb angle of the major curve at final follow-up, and the correction rate (all P > 0.05). Conclusions: When performing posterior correction for scoliosis, the surgeons should be aware that the patients with Marfan syndrome scoliosis had more estimated blood loss and longer operation duration than AIS patients, while the correction rate was similar. [ABSTRACT FROM AUTHOR]

Study Design. A retrospective radiographical analysis. Objective. To assess the effect of unfused segments in the reconstitution of coronal balance after posterior selective thoracolumbar/lumbar (TL/L) curve fusion for adolescent idiopathic scoliosis. Summary of Background Data. Current literature suggests that compensatory changes occur after selective TL/L curve fusion surgery. Hitherto, the roles of the unfused levels in coronal balance reconstitution have not been fully understood. Methods. Radiographical data of patients with idiopathic scoliosis who underwent selective posterior TL7L curve fusion Peking Union Medical College Hospital before October 2011 with a minimum of 2 years of follow-up period were retrospectively analyzed. Changes of coronal trunk shift during the follow-up period were studied and multiple linear regression analysis was performed to determine its correlation with changes of upper and lower curve of unfused thoracic segments, instrumented segments angle, distal unfused segments angle, and coronal sacral inclination. Results. A total of 43 patients were included in this study. Preoperative and first erect radiographs demonstrated trunk shifts of 21.1 mm and 18.7 mm respectively, showing no significant differences (P = 0.205). At the last follow-up, it compensated to 9 mm, which showed significant differences (P <0.01). Regression analysis of all patients showed that coronal trunk shift changes only correlated with distal unfused segment angle changes. Subgroup analysis based on the magnitude of preoperative thoracic curve found that only distal unfused segments .had an impact on coronal balance reconstitution. However, subgroup analysis based on the flexibility of preoperative thoracic curve showed that both proximal unfused thoracic segments and distal unfused lumbar segments contributed to coronal balance compensation in patients with a thoracic curve flexibility rate of more than 70%. Conclusion. The reconstitution of coronal balance was mainly compensated by distal unfused segments after selective posterior fusion of TL/L idiopathic scoliosis. The effect of unfused thoracic segments in coronal balance reconstitution mainly depended on its flexibility. [ABSTRACT FROM AUTHOR]

Background: The patients with extremely severe spinal deformity are commonly considered high-risk candidates for surgical treatment because of their underlying lung disease. Currently, little has been reported about the postoperative pulmonary complication events in this population. This retrospective study sought to evaluate preoperative pulmonary function tests in the surgical treatment of extremely severe scoliosis. Methods: Preoperative forced vital capacity (FVC), FVC ratio, forced expiratory volume at the end of the first second (FEV1), FEV1 ratio, peak expiratory flow (PEF), and PEF ratio were performed and evaluated on 60 patients with extremely severe scoliosis (coronary main Cobb angle ≥100°). Results: Among the 60 patients, 11 (18.3%), 13 (21.7%), and 22 (36.7%) had severe, moderate, and mild pulmonary dysfunction, respectively. Compared with the moderate and mild scoliosis groups, significant differences were observed in Cobb, FVC, FVC ratio, FEV1, FEV1 ratio, and PEF ratio in the extremely severe scoliosis group. Various postoperative pulmonary complications occurred in nine cases (15%). Patients with severe or moderate dysfunction as measured by the FVC ratio had a higher incidence of postoperative pulmonary complications. A transthoracic procedure was not related to postoperative pulmonary complications, but thoracoplasty significantly increased the incidence of postoperative pulmonary complications (P < 0.001, OR = 20, 95% CI = 3.45–115.97). Discussion: Pulmonary function was impaired in extremely severe scoliosis. Patients with severe restrictive pulmonary dysfunction had a higher incidence of postoperative pulmonary complications. Thoracoplasty was an important risk factor in the prediction of postoperative pulmonary complications. [ABSTRACT FROM AUTHOR]

The article discusses the results of a study which compared radiologic and clinical outcomes, efficiency and cost between anterior spinal fusion (ASF) and posterior spine fusion (PSF) in surgical treatment of moderate lumbar/thoracolumbar adolescent idiopathic scoliosis (AIS). The study found shorter fusion levels and reduced surgical trauma and costs in ASF.

Background: In idiopathic scoliosis patients, after anterior spinal fusion and instrumentation, the discs (interspace angle) between the lowest instrumented vertebra (LIV) and the next caudal vertebra became more wedged. We reviewed these patients and analyzed the changes of the angle. Methods: By reviewing the medical records and roentgenograms of adolescent idiopathic scoliosis patients underwent anterior spinal fusion and instrumentation, Cobb angle of the curve, correction rate, coronal balance, LIV rotation, interspace angle were measured and analyzed. Results: There were total 30 patients included. The mean coronal Cobb angle of the main curve (thoracolumbar/lumbar curve) before and after surgery were 48.9° and 11.7°, respectively, with an average correction rate of 76.1%. The average rotation of LIV before surgery was 2.1 degree, and was improved to 1.2 degree after surgery. The interspace angle before surgery, on convex side-bending films, after surgery, at final follow up were 3.2°, -2.3°, 1.8° and 4.9°, respectively. The difference between the interspace angle after surgery and that preoperatively was not significant (P = 0.261), while the interspace angle at final follow-up became larger than that after surgery, and the difference was significant(P = 0.012). The interspace angle after surgery was correlated with that on convex side-bending films (r = 0.418, P = 0.022), and the interspace angle at final follow-up was correlated with that after surgery (r = 0.625, P = 0.000). There was significant correlation between the loss of the interspace angle and the loss of coronal Cobb angle of the main curve during follow-up (r = 0.483, P = 0.007). Conclusion: The interspace angle could be improved after anterior correction and instrumentation surgery, but it became larger during follow-up. The loss of the interspace angle was correlated with the loss of coronal Cobb angle of the main curve during follow-up. [ABSTRACT FROM AUTHOR]

STUDY DESIGN.: A retrospective radiographic study on the type of surgically treated idiopathic scoliosis, with a prospective study on the reliability of the type-related fusion guide. OBJECTIVES.: To identify and classify surgically treated idiopathic scoliosis, and define its related fusion levels by a new classification system. SUMMARY OF BACKGROUND DATA.: Some classification methods for idiopathic scoliosis have been suggested. However, poor intraobserver reproducibility and interobserver reliability were experienced in these studies, and were not appropriate for guiding surgical planning. METHODS.: A total of 427 surgically treated idiopathic scoliosis cases were reviewed. Preoperative and postoperative standing anteroposterior, lateral, and preoperative supine side-bending radiograph were analyzed using the Scoliosis Research Society definition of scoliosis and curve apex. The resulting classification was tested for intraobserver reliability and interobserver reliability, and by 6 surgeons. Apical frequencies were determined for each type, and prospective surgical testing of the new type and its related fusion guide was performed. RESULTS.: Three major types and 13 subtypes were identified, of which the Peking Union Medical College type I accounted for 56.62%, type II 42.16%, and type III 1.22%. The interobserver reliability testing was 85% (kappa coefficient 0.832), while intraobserver reproducibility was 91% (kappa coefficient 0.898). Each type had its corresponding fusion levels. A prospective study of 152 cases was performed according to the classification. All of these cases were followed over 18 months, and no postoperative decompensation was noted. CONCLUSION.: The Peking Union Medical College classification of idiopathic scoliosis is one system to combine each type with its corresponding fusion level, and it had much higher interobserver reliability and intraobserver reproducibility than the King system. Further prospectivestudies would help to clarify and expand this system. [ABSTRACT FROM AUTHOR]