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S2 alar-iliac screw

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https://www.readbyqxmd.com/read/29109887/usefulness-of-sacral-sublaminar-wire-for-low-transverse-sacral-fractures-two-cases-report
#1
Tatsuro Sasaji, Hideki Imaizumi, Taishi Murakami
Low transverse sacral fractures are rare, with only two published reports regarding their surgery. The complication associated with surgery for sacral fractures is the prominence of implants. In addition, screw fixation below S3 is impractical. We performed posterior sacral fixation using S2 alar iliac (S2AI) screws and sacral sublaminar wires for low transverse sacral fractures. Case 1 was 65-year-old male with an S2-3 transverse sacral fracture. We performed laminectomy (S2-3) and passed ultrahigh molecular weight polyethylene (UHMWPE) cables from laminectomy area to the third posterior sacral foramina...
2017: Case Reports in Orthopedics
https://www.readbyqxmd.com/read/28989847/comparison-between-s2-alar-iliac-screw-fixation-and-iliac-screw-fixation-in-adult-deformity-surgery-reoperation-rates-and-spinopelvic-parameters
#2
Wataru Ishida, Benjamin D Elder, Christina Holmes, Sheng-Fu L Lo, C Rory Goodwin, Thomas A Kosztowski, Ali Bydon, Ziya L Gokaslan, Jean-Paul Wolinsky, Daniel M Sciubba, Timothy F Witham
STUDY DESIGN: Retrospective cohort study. OBJECTIVE: The S2-alar-iliac (S2AI) technique has been described as an alternative method for pelvic fixation in place of iliac screws (ISs) in spinal deformity surgery. The objective of this study was to analyze the impact of S2AI screws on radiographical outcomes, including spinopelvic parameters. METHODS: A retrospective review of 17 patients receiving ISs and 46 patients receiving S2AI screws for correction of adult spinal deformity between 2010 and 2015 with minimum 1-year follow-up was conducted...
October 2017: Global Spine Journal
https://www.readbyqxmd.com/read/28890028/a-novel-technique-for-placement-of-sacro-alar-iliac-s2ai-screws-by-k-wire-insertion-using-intraoperative-navigation
#3
Kevin Phan, Julian Li, Gloria Giang, Ian Teng, Steven Phan, Nicholas Chang, Ralph Mobbs
Sacral-iliac fixation techniques may be indicated in the management of various lumbosacral pathologies including spinal degeneration, infection, tumour resection, fracture, pseudarthrosis, correction of spinal deformities involving long fusion constructs to the sacrum and cases with poor sacral fixation. There are a number of options for lumbosacral fixation each with their own advantages and disadvantages. Though S2-alar-iliac (S2AI) have demonstrated promising advantages over alternatives, the complex anatomy of the spinopelvic region demands precise insertion of the screws to create a biomechanically robust construct safely...
November 2017: Journal of Clinical Neuroscience: Official Journal of the Neurosurgical Society of Australasia
https://www.readbyqxmd.com/read/28870838/comparison-of-s2-alar-and-traditional-iliac-screw-pelvic-fixation-for-pediatric-neuromuscular-deformity
#4
Mark C Lee, Casey Jarvis, Matthew J Solomito, Jeffrey Thomson
Background Context Many pelvic fixation options exist for posterior spinal fusion of pediatric neuromuscular scoliosis, including standard iliac screws (SIS) or a more recently introduced S2-Alar (S2A) technique. However, little data exists comparing the clinical and radiographic outcomes of these techniques. Purpose Identify differences in clinical and radiographic outcomes for pediatric neuromuscular scoliosis patients treated with standard iliac screw (SIS) or S2-Alar (S2-A) pelvic fixation. Study Design/Setting Retrospective cohort study at a pediatric orthopaedic clinic...
September 1, 2017: Spine Journal: Official Journal of the North American Spine Society
https://www.readbyqxmd.com/read/28766018/s2-ai-screw-placement-with-the-aide-of-electronic-conductivity-device-monitoring-a-retrospective-analysis
#5
Faheem A Sandhu, Jason E McGowan, Daniel R Felbaum, Hasan R Syed, Kyle B Mueller
STUDY DESIGN: A retrospective analysis of two consecutive patients who underwent a novel surgical technique. OBJECTIVE: A report of a novel surgical technique utilizing an electronic conductivity device guidance to aide placement of S2-Alar-Iliac (S2-AI) instrumentation. Electronic conductivity guidance for instrumentation of the thoracolumbar spine is an accepted means of improving intraoperative accuracy. Although commercially available for percutaneous techniques, there is a paucity of literature regarding its use...
November 2017: European Spine Journal
https://www.readbyqxmd.com/read/28583753/optimal-trajectory-and-insertion-accuracy-of-sacral-alar-iliac-screws
#6
Katsutaka Yamada, Takayuki Higashi, Kanichiro Kaneko, Manabu Ide, Tatsuhiro Sekiya, Tomoyuki Saito
OBJECTIVE: The aim of this study was to analyse the optimal trajectories for sacral alar iliac screws (SAISs) in a Japanese patient population and the clinical assessment of insertion accuracies. METHODS: The ideal trajectories of SAISs, starting from 2 mm medial to the apex of the lateral sacral crest on the midline between S1 and S2 dorsal foramina, were measured in 80 consecutive spinal disease patients (40 males and 40 females; average age: 67.4 ± 8.1 years) using three-dimensional computed tomographic image software...
June 2, 2017: Acta Orthopaedica et Traumatologica Turcica
https://www.readbyqxmd.com/read/28247077/s2-alar-iliac-screw-placement-under-robotic-guidance-for-adult-spinal-deformity-patients-technical-note
#7
Seung-Jae Hyun, Ki-Jeong Kim, Tae-Ahn Jahng
PURPOSE: S2 alar-iliac (S2AI) screws are generally placed using an open approach, but have recently been shown to be implantable using a minimally invasive approach. Nevertheless, optimal screw positioning, even when supported by fluoroscopic guidance, is challenging in the complex anatomy of the sacral-pelvic area. This work presents our novel technique of S2AI sacropelvic fixation procedures performed with robotic guidance. METHODS: This was a single-center, retrospective, mini case-series of adult spinal deformity patients in need of sacropelvic fixation as part of a longer thoraco-lumbar fusion...
August 2017: European Spine Journal
https://www.readbyqxmd.com/read/28185981/analysis-of-the-s2-alar-iliac-screw-as-compared-with-the-traditional-iliac-screw-does-it-increase-stability-with-sacroiliac-fixation-of-the-spine
#8
Daniel G Hoernschemeyer, Troy D Pashuck, Ferris M Pfeiffer
BACKGROUND CONTEXT: Arthrodesis of the lumbosacral junction continues to be a challenge in pediatric and adult spinal deformity surgery. PURPOSE: To evaluate the biomechanical rigidity of two types of lumbosacral fixation. Our hypothesis was that the use of S2 alar-iliac (S2AI) fixation will result in statistically similar biomechanical fixation as compared with use of an iliac screw with a 95% confidence interval. STUDY SETTING: Controlled biomechanical laboratory METHODS: Ten human cadaveric lumbosacral specimens were separated into two test groups: (1) S2AI (n=5) and (2) iliac screw (n=5)...
February 6, 2017: Spine Journal: Official Journal of the North American Spine Society
https://www.readbyqxmd.com/read/28107243/robotic-guidance-for-s2-alar-iliac-screws-in-spinal-deformity-correction
#9
S Samuel Bederman, Peter Hahn, Vincent Colin, P Douglas Kiester, Nitin N Bhatia
STUDY DESIGN: A retrospective cohort study of patients who underwent S2-alar-iliac (S2AI) screw insertion using robotic guidance in long constructs for spinal deformity correction extending to the sacrum performed at a single institution. OBJECTIVE: To assess and evaluate the feasibility and accuracy of robotic guidance for S2AI screw insertion. SUMMARY OF BACKGROUND DATA: Pelvic fixation has become a common adjunct to long fusions extending to the sacrum...
February 2017: Clinical Spine Surgery
https://www.readbyqxmd.com/read/28097243/range-of-motion-sacral-screw-and-rod-strain-in-long-posterior-spinal-constructs-a-biomechanical-comparison-between-s2-alar-iliac-screws-with-traditional-fixation-strategies
#10
Chester E Sutterlin, Antony Field, Lisa A Ferrara, Andrew L Freeman, Kevin Phan
BACKGROUND: S1 screw failure and L5/S1 non-union are issues with long fusions to S1. Improved construct stiffness and S1 screw offloading can help avoid this. S2AI screws have shown to provide similar stiffness to iliac screws when added to L3-S1 constructs. We sought to examine and compare the biomechanical effects on an L2-S1 pedicle screw construct of adding S2AI screws, AxiaLIF, L5-S1 interbody support via transforaminal lumbar interbody fusion (TLIF), and to examine the effect of the addition of cross connectors to each of these constructs...
December 2016: Journal of Spine Surgery (Hong Kong)
https://www.readbyqxmd.com/read/27852493/biomechanical-comparison-of-spinopelvic-fixation-constructs-iliac-screw-versus-s2-alar-iliac-screw
#11
Camden B Burns, Karan Dua, Nicholas A Trasolini, David E Komatsu, James M Barsi
STUDY DESIGN: Biomechanical cadaveric study. OBJECTIVE: To compare the biomechanical properties of the iliac and S2-Alar-Iliac (S2AI) screw in a similar spinopelvic fixation construct. SUMMARY OF BACKGROUND DATA: Spinopelvic fixation is used in the correction of pelvic obliquity, high-grade spondylolisthesis, and long spinal fusions. With the development of pedicle screw fixation, the iliac screw has been used as an anchor point to the pelvis...
January 2016: Spine Deformity
https://www.readbyqxmd.com/read/27756675/utilization-of-a-technique-of-percutaneous-s2-alar-iliac-fixation-in-immunocompromised-patients-with-spondylodiscitis
#12
Haruki Funao, Khaled M Kebaish, Norihiro Isogai, Takahiro Koyanagi, Morio Matsumoto, Ken Ishii
BACKGROUND: Spondylodiscitis still remains a serious problem, especially in immunocompromised patients. Surgery is necessary when nonsurgical treatment is unsuccessful. Although minimally invasive spine stabilization (MISt) with percutaneous pedicle screws is less invasive, percutaneous sacropelvic fixation techniques are not common practice. Here, we describe 2 cases in which spondylodiscitis in the lumbosacral spine was treated with percutaneous stabilization using an S2 alar-iliac (S2AI) screw technique...
January 2017: World Neurosurgery
https://www.readbyqxmd.com/read/27341341/fate-of-s2-alar-iliac-screws-after-12-month-minimum-radiographic-follow-up-preliminary-results
#13
Marcus D Mazur, Mark A Mahan, Lubdha M Shah, Andrew T Dailey
BACKGROUND: S2-alar-iliac (S2AI) screws are 1 technique for lumbopelvic fixation to improve fusion rates across the lumbosacral junction that has gained wider acceptance. The S2AI screw crosses the cortical surfaces of the sacroiliac joint (SIJ), which may improve the biomechanical strength of the instrumentation. OBJECTIVE: To report preliminary radiographic outcomes of patients who underwent lumbopelvic fixation with S2AI screws with a minimum 12-month follow-up...
January 1, 2017: Neurosurgery
https://www.readbyqxmd.com/read/27319308/s2-alar-iliac-screws-are-associated-with-lower-rate-of-symptomatic-screw-prominence-than-iliac-screws-radiographic-analysis-of-minimal-distance-from-screw-head-to-skin
#14
Wataru Ishida, Benjamin D Elder, Christina Holmes, C Rory Goodwin, Sheng-Fu L Lo, Thomas A Kosztowski, Ali Bydon, Ziya L Gokaslan, Jean-Paul Wolinsky, Daniel M Sciubba, Timothy F Witham
BACKGROUND: In sacropelvic fixation, the iliac screw technique offers biomechanically strong constructs, but its disadvantages include screw prominence, wound dehiscence, and postoperative pain secondary to the high profile nature. To overcome this drawback, S2-alar-iliac (S2AI) screws were developed as an alternative technique for sacropelvic fixation. This study aimed to compare the S2AI screw technique with the iliac screw technique in terms of postoperative symptomatic screw prominence...
September 2016: World Neurosurgery
https://www.readbyqxmd.com/read/27272491/robotic-guided-sacro-pelvic-fixation-using-s2-alar-iliac-screws-feasibility-and-accuracy
#15
Xiaobang Hu, Isador H Lieberman
PURPOSE: To review our experience with robotic guided S2-alar iliac (S2AI) screw placement. METHODS: We retrospectively reviewed patients who underwent S2AI fixation with robotic guidance. Screw placement and deviation from the preoperative plan were assessed by fusing preoperative CT (with the planned S2AI screws) to postoperative CT. The software's measurement tool was used to compare the planned vs. actual screw placements in axial and lateral views, at entry point to the S2 pedicle and at a 30 mm depth at the screws' mid-shaft, in a resolution of 0...
March 2017: European Spine Journal
https://www.readbyqxmd.com/read/27254657/use-of-s2-alar-iliac-screws-associated-with-less-complications-than-iliac-screws-in-adult-lumbosacropelvic-fixation
#16
Benjamin D Elder, Wataru Ishida, Sheng-Fu L Lo, Christina Holmes, C Rory Goodwin, Thomas A Kosztowski, Ali Bydon, Ziya L Gokaslan, Jean-Paul Wolinsky, Daniel M Sciubba, Timothy F Witham
STUDY DESIGN: Retrospective comparative study. OBJECTIVE: To compare clinical and radiographic outcomes between the S2-alar-iliac (S2AI) and the iliac screw (IS) techniques in the adult population and clarify the clinical strength of S2AI screws. SUMMARY OF BACKGROUND DATA: S2AI screws have been described as an alternative method for lumbosacropelvic fixation in place of ISs. The S2AI technique has several advantages with lower prominence, increased ability to directly connect to proximal instrumentation, less extensive dissection of tissue, and enhanced biomechanical strength over the IS technique...
February 2017: Spine
https://www.readbyqxmd.com/read/27028385/s2-alar-iliac-fixation-a-powerful-procedure-for-the-treatment-of-kyphoscoliosis
#17
Zhen Liu, Yong Qiu, Huang Yan, Zong-shan Hu, Feng Zhu, Jun Qiao, Lei-lei Xu, Bin Wang, Yang Yu, Bang-ping Qian, Ze-zhang Zhu
The purpose of this study was to introduce a powerful technique for the treatment of kyphoscoliosis. There are currently multiple techniques for sacropelvic fixation, including trans-iliac bars and iliac and iliosacral screws. Several studies have documented the use of these instrumentation techniques; however, a ubiquitous problematic issue concerns the need for separate incisions for the use of offset connectors, which add to surgical time and morbidity. Any additional dissection of the skin, subcutaneous tissue or muscle in this area is believed to increase the incidence of complications of wound healing...
February 2016: Orthopaedic Surgery
https://www.readbyqxmd.com/read/27008335/modified-iliac-screw-fixation-technique-and-clinical-application
#18
Seil Sohn, Chun Kee Chung, Yongjung Jay Kim, Chi Heon Kim, Sung Bae Park, Hyejin Kim
BACKGROUND: A conventional iliac bolt and the S2 alar iliac screw fixation technique (S2AI) are commonly used sacropelvic fixation techniques. However, conventional iliac bolt technique requires a lateral connector and commonly has prominent screw head problems. S2AI reportedly has a high instrument failure rate. We aim to introduce a modified iliac screw fixation technique and to investigate its clinical application in adult patients. METHODS: The entrance site of the modified iliac screw fixation technique was 1 cm medial and 1 cm caudal from the posterosuperior iliac spine...
May 2016: Acta Neurochirurgica
https://www.readbyqxmd.com/read/26819698/free-hand-insertion-technique-of-s2-sacral-alar-iliac-screws-for-spino-pelvic-fixation-technical-note-acadaveric-study
#19
Jong-Hwa Park, Seung-Jae Hyun, Ki-Jeong Kim, Tae-Ahn Jahng
A rigid spino-pelvic fixation to anchor long constructs is crucial to maintain the stability of long fusion in spinal deformity surgery. Besides obtaining immediate stability and proper biomechanical strength of constructs, the S2 alar-iliac (S2AI) screws have some more advantages. Four Korean fresh-frozen human cadavers were procured. Free hand S2AI screw placement is performed using anatomic landmarks. The starting point of the S2AI screw is located at the midpoint between the S1 and S2 foramen and 2 mm medial to the lateral sacral crest...
December 2015: Journal of Korean Neurosurgical Society
https://www.readbyqxmd.com/read/26442278/rigid-posterior-lumbopelvic-fixation-without-formal-debridement-for-pyogenic-vertebral-diskitis-and-osteomyelitis-involving-the-lumbosacral-junction-technical-report
#20
Marcus D Mazur, Vijay M Ravindra, Andrew T Dailey, Sara McEvoy, Meic H Schmidt
BACKGROUND: Pelvic fixation with S2-alar-iliac (S2AI) screws can increase the rigidity of a lumbosacral construct, which may promote bone healing, improve antibiotic delivery to infected tissues, and avoid L5-S1 pseudarthrosis. PURPOSE: To describe the use of single-stage posterior fixation without debridement for the treatment of pyogenic vertebral diskitis and osteomyelitis (PVDO) at the lumbosacral junction. STUDY DESIGN: Technical report...
2015: Frontiers in Surgery
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