P82. Limited bend out of proximal thoracic curve is associated with add on phenomenon following posterior surgery for Lenke 1A curves

2021 ◽  
Vol 21 (9) ◽  
pp. S179-S180
Author(s):  
Saechin Kim ◽  
Gleeson Rebello ◽  
Nikolaos Paschos
Keyword(s):  
Thoracic Curve ◽  
Posterior Surgery

scholarly journals Application of Intraoperative CT-Guided Navigation in Simultaneous Minimally Invasive Anterior and Posterior Surgery for Infectious Spondylitis

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
Meng-Huang Wu ◽  
Navneet Kumar Dubey ◽  
Ching-Yu Lee ◽  
Yen-Yao Li ◽  
Chin-Chang Cheng ◽  
...  
Keyword(s):  
Minimally Invasive ◽  
Pedicle Screws ◽  
Ct Guided ◽  
Posterior Surgery ◽  
Intraoperative Computed Tomography ◽  
Reactive Protein ◽  
Angle Correction ◽  
Average Operative Time ◽  
Placement Accuracy ◽  
Infectious Spondylitis

This study was aimed at evaluating the safety and efficacy of using intraoperative computed tomography- (iCT-) guided navigation in simultaneous minimally invasive anterior and posterior surgery for infectious spondylitis. Nine patients with infectious spondylitis were enrolled in this study. The average operative time was 327.6 min (range, 210–490) and intraoperative blood loss was 407 cc (range, 50–1,200). The average duration of hospital stay was 48.9 days (range, 11–76). Out of a total of 54 pedicle screws employed, 53 screws (98.1%) were placed accurately. A reduced visual analog scale on back pain (from 8.2 to 2.2) and Oswestry disability index (from 67.1% to 25.6%) were found at the 2-year follow-up. All patients had achieved resolution of spinal infection with reduced average erythrocyte sedimentation rate (from 83.9 to 14.1 mm/hr) and average C-reactive protein (from 54.4 to 4.8 mg/dL). Average kyphotic angle correction was 10.5° (range, 8.4°–12.6°) postoperatively and 8.5° (range, 6.9°–10.1°) after 2 years. In conclusion, the current iCT-guided navigation approach has been demonstrated to be an alternative method during simultaneous minimally invasive anterior and posterior surgery for infectious spondylitis. It can provide a good intraoperative orientation and visualization of anatomic structures and also a high pedicle screw placement accuracy in patient’s lateral decubitus position.

scholarly journals Main thoracic curve adolescent idiopathic scoliosis: association of higher rod stiffness and concave-side pedicle screw density with improvement in sagittal thoracic kyphosis restoration

2015 ◽  
Vol 22 (3) ◽  
pp. 259-266 ◽  
Author(s):  
Hui Liu ◽  
Zemin Li ◽  
Sibei Li ◽  
Kuibo Zhang ◽  
Hao Yang ◽  
...  
Keyword(s):  
High Density ◽  
Thoracic Curve ◽  
Screw Placement ◽  
Major Curve ◽  
High Stiffness ◽  
Main Thoracic ◽  
Group A ◽  
Screw Density ◽  
Low Stiffness ◽  
Group D

OBJECT The aim of this study was to evaluate the effects of rod stiffness and implant density on coronal and sagittal plane correction in patients with main thoracic curve adolescent idiopathic scoliosis (AIS). METHODS The authors conducted a retrospective study of 77 consecutive cases involving 56 female and 21 male patients with Lenke Type 1 main thoracic curve AIS who underwent single-stage posterior correction and instrumented spinal fusion with pedicle screw fixation between July 2009 and July 2012. The patients' mean age at surgery was 15.79 ± 3.21 years. All patients had at least 1 year of follow-up. Radiological parameters in the coronal and sagittal planes, including Cobb angle of the major curve, side-bending Cobb angle of the major curve, thoracic kyphosis (TK), correction rates, and screw density, were measured and analyzed. Screw densities (calculated as number of screws per fusion segment × 2) of < 0.60 and ≥ 0.60 were defined as low and high density, respectively. Titanium rods of 5.5 mm and 6.35 mm diameter were defined as low and high stiffness, respectively. Patients were divided into 4 groups based on the type of rod and density of screw placement that had been used: Group A, low-stiffness rod with low density of screw placement; Group B, low-stiffness rod with high density of screw placement; Group C, high-stiffness rod with low density of screw placement; Group D, high-stiffness rod with high density of screw placement. RESULTS The mean coronal correction rate of the major curve, for all 77 patients, was (81.45% ± 7.51%), and no significant difference was found among the 4 groups (p > 0.05). Regarding sagittal plane correction, Group A showed a significant decrease in TK after surgery (p < 0.05), while Group D showed a significant increase (p < 0.05); Group B and C showed no significant postoperative changes in TK (p > 0.05). The TK restoration rate was highest in Group D and lowest in Group A (A, −39.32% ± 7.65%; B, −0.37% ± 8.25%; C, −4.04% ± 6.77%; D, 37.59% ± 8.53%). Screw density on the concave side was significantly higher than that on the convex side in all the groups (p < 0.05). CONCLUSIONS For flexible main thoracic curve AIS, both rods with high stiffness and those with low stiffness combined with high or low screw density could provide effective correction in the coronal plane; rods with high stiffness along with high screw density on the concave side could provide better outcome with respect to sagittal TK restoration.

Nerve sheath tumors involving the sacrum

2003 ◽  
Vol 15 (2) ◽  
pp. 1-6 ◽  
Author(s):  
Paul Klimo ◽  
Ganesh Rao ◽  
Richard H. Schmidt ◽  
Meic H. Schmidt
Keyword(s):  
Type I ◽  
Nerve Sheath Tumor ◽  
Delayed Presentation ◽  
Type Ii ◽  
Complete Excision ◽  
Posterior Surgery ◽  
Sacral Nerve ◽  
Type Iii ◽  
Nerve Sheath Tumors ◽  
Nerve Sheath

Nerve sheath tumors that involve the sacrum are rare. Delayed presentation is common because of their slow-growing nature, the permissive surrounding anatomical environment, and nonspecific symptoms. Consequently, these tumors are usually of considerable size at the time of diagnosis. The authors discuss a case of a sacral nerve sheath tumor. They also propose a classification scheme for these tumors based on their location with respect to the sacrum into three types (Types I–III). Type I tumors are confined to the sacrum; Type II originate within the sacrum but then locally metastasize through the anterior and posterior sacral walls into the presacral and subcutaneous spaces, respectively; and Type III are located primarily in the presacral/retroperitoneal area. The overwhelming majority of sacral nerve sheath tumors are schwannomas. Neurofibromas and malignant nerve sheath tumors are exceedingly rare. Regardless of their histological features, the goal of treatment is complete excision. Adjuvant radiotherapy may be used in patients in whom resection was subtotal. Approaches to the sacrum can generally be classified as anterior or posterior. Type I tumors may be resected via a posterior approach alone, Type III may require an anterior approach, and Type II tumors usually require combined anterior–posterior surgery.

Posterior Surgery of Neurologically Compromised Osteoporotic Kyphosis - Posterolateral Decompression and Stabilization using Titanium Mesh -

2008 ◽  
Vol 43 (6) ◽  
pp. 791
Author(s):  
Jung-Hee Lee ◽  
Ki-Tack Kim ◽  
Kyung-Soo Suk ◽  
Sang-Hun Lee ◽  
Dae-Woo Hwang ◽  
...  
Keyword(s):  
Titanium Mesh ◽  
Posterior Surgery

scholarly journals The recognition and modelling of a backbone and its deformity

2014 ◽  
Vol 19 (1) ◽  
pp. 55-66
Author(s):  
Ramūnas Markauskas ◽  
Algimantas Juozapavičius ◽  
Kęstutis Saniukas ◽  
Giedrius Bernotavičius
Keyword(s):  
Adolescent Idiopathic Scoliosis ◽  
Idiopathic Scoliosis ◽  
Input Data ◽  
Thoracic Curve ◽  
Line Centre ◽  
High Quality ◽  
Radiographic Images ◽  
Initial Curvature ◽  
Curvature Detection ◽  
Quality Features

In this article the authors present a method for the backbone recognition and modelling. The process of recognition combines some classical techniques (Hough transformation, GVF snakes) with some new (authors present a method for initial curvature detection, which they call the Falling Ball method). The result enables us to identify high-quality features of the spine and to detect the major deformities of backbone: the intercrestal line, centre sacral vertical line, C7 plumbline; as well as angles: proximal thoracic curve, main thoracic curve, thoracolumbar/lumbar. These features are used for measure in adolescent idiopathic scoliosis, especially in the case of treatment. Input data are just radiographic images, meet in everyday practice.

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