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Keitaro Matsukawa, Takashi Kato, Ralph Mobbs, Yoshiyuki Yato and Takashi Asazuma

Viswanathan VK , Ganguly R , Minnema AJ , Biomechanical assessment of proximal junctional semi-rigid fixation in long-segment thoracolumbar constructs . J Neurosurg Spine . 2018 ; 30 ( 2 ): 184 – 192 . 25 Ito Z , Matsuyama Y , Sakai Y , Bone union rate with autologous iliac bone versus local bone graft in posterior lumbar interbody fusion . Spine (Phila Pa 1976) . 2010 ; 35 ( 21 ): E1101 – E1105 . 26 Mattei TA , Fassett DR . Combined S-1 and S-2 sacral alar-iliac screws as a salvage technique for pelvic fixation after pseudarthrosis and

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Tobias A. Mattei and Daniel R. Fassett

. J Anat 195 : 301 – 304 , 1999 16 Martin CT , Witham TF , Kebaish KM : Sacropelvic fixation: two case reports of a new percutaneous technique . Spine (Phila Pa 1976) 36 : E618 – E621 , 2011 17 Mattei TA , Fassett DR : Low-profile pelvic fixation with sacral alar-iliac screws . Acta Neurochir (Wien) 155 : 293 – 297 , 2013 18 Mattei TA , Fassett DR : The O-arm revolution in spine surgery . J Neurosurg Spine (in press) 2013 . (Letter) 19 Moshirfar A , Rand FF , Sponseller PD , Parazin SJ , Khanna AJ , Kebaish

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Bryan W. Cunningham, Paul D. Sponseller, Ashley A. Murgatroyd, Jun Kikkawa and P. Justin Tortolani

throughout the testing procedures. Specimen Reconstruction: Construct Testing Sequence Following preparation, the 21 lumbopelvic specimens were randomized into the 3 treatment groups: S1–2 sacral screws (n = 7), S1–sacral alar iliac screws (n = 7), and S1–iliac screws (n = 7). Multidirectional flexibility testing was performed on the intact, prefatigue, and postfatigue reconstruction conditions, and the S1–iliac screw group was evaluated with both unilateral and bilateral iliac fixation to assess the kinematic differences of one versus two iliac screws. Transpedicular

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Tobias A. Mattei

technique for spinopelvic fixation. J Neurosurg Spine 28: 543–547, May 2018 ). Fig. 1. A: Illustration of the entry points and ideal trajectory of the S-1 ( upper arrow ) and S-2 ( lower arrow ) sacral-alar iliac screws. B and C: Postoperative anteroposterior (AP) and lateral plain radiographs after a revision surgery for pseudarthrosis in a patient previously submitted to pelvic fixation using classic iliac wing screws; the revision surgery involved placement of combined S-1 and S-2 alar-iliac screws. Note the trajectory of both screws converging toward the upper

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Tobias A. Mattei and Daniel R. Fassett

-called “freehand” technique) can be safely performed during the vast majority of cases that do not involve major deformities, with rates of pedicle violation that are not significantly different from those of procedures in which intraoperative fluoroscopy is employed. 15 , 16 In relation to pelvic fixation, although several studies have demonstrated that the new technique of using sacral-alar iliac screws may present major advantages over the classic iliac wing screws, 13 , 14 the study of Ray et al. 20 is the first report in the literature of the benefits of employing

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sacral alar-iliac screws as a salvage technique for pelvic fixation after pseudarthrosis and lumbosacropelvic instability Tobias A. Mattei Daniel R. Fassett 9 2013 19 3 321 330 10.3171/2013.5.SPINE121118 2013.5.SPINE121118 Comparative effectiveness and cost-benefit analysis of local application of vancomycin powder in posterior spinal fusion for spine trauma Saniya S. Godil Scott L. Parker Kevin R. O'Neill Clinton J. Devin Matthew J. McGirt 9 2013 19 3 331 335 10.3171/2013.6.SPINE121105 2013.6.SPINE121105 Epidural application of spinal instrumentation

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James D. Lin, Lee A. Tan, Chao Wei, Jamal N. Shillingford, Joseph L. Laratta, Joseph M. Lombardi, Yongjung J. Kim, Ronald A. Lehman Jr. and Lawrence G. Lenke

( 10 Suppl ): S262 , 2017 (Abstract) 10.1016/j.spinee.2017.08.194 9 Mattei TA , Fassett DR : Combined S-1 and S-2 sacral alar-iliac screws as a salvage technique for pelvic fixation after pseudarthrosis and lumbosacropelvic instability: combined S-1 and S-2 sacral alar-iliac screws as a salvage technique for pelvic fixation after pseudarthrosis and lumbosacropelvic instability: technical note . J Neurosurg Spine 19 : 321 – 330 , 2013 23808582 10 O’Brien JR , Matteini L , Yu WD , Kebaish KM : Feasibility of minimally invasive sacropelvic

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Kentaro Yamada, Yuichiro Abe and Shigenobu Satoh

.1007/s00276-011-0919-2 22194086 6 Lee SH , Jin W , Kim KT , Suk KS , Lee JH , Seo GW : Trajectory of transsacral iliac screw for lumbopelvic fixation: a 3-dimensional computed tomography study . J Spinal Disord Tech 24 : 151 – 156 , 2011 10.1097/BSD.0b013e3181e7c120 20634727 7 Martin CT , Witham TF , Kebaish KM : Sacropelvic fixation: two case reports of a new percutaneous technique . Spine (Phila Pa 1976) 36 : E618 – E621 , 2011 8 Mattei TA , Fassett DR : Combined S-1 and S-2 sacral alar-iliac screws as a salvage technique for

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Tobias A. Mattei

]. Bogotá: Javeriana University School of Medicine, 1964 Adams RD, Fisher CM, Hakim S, Ojemann RG, Sweet WH: Symptomatic occult hydrocephalus with normal cerebrospinal-fluid pressure. N Engl J Med 273: 117–126, 1965 C1–2 posterior screw fixation Goel A, Laheri V: Plate and screw fixation for atlanto-axial subluxation. Acta Neurochir (Wien) 129: 47–53, 1994 Harms J, Melcher RP: Posterior C1–C2 fusion with polyaxial screw and rod fixation. Spine (Phila Pa 1976) 26: 2467–2471, 2001 S1–alar iliac fixation Mattei TA, Fassett DR: Combined S-1 and S-2 sacral alar-iliac screws

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Sanghyun Han, Seung-Jae Hyun, Ki-Jeong Kim, Tae-Ahn Jahng and Hyun-Jib Kim

thoracolumbar kyphosis in adults . Spine (Phila Pa 1976) 31 ( 19 Suppl ): S161 – S170 , 2006 18 Omidi-Kashani F , Hasankhani EG , Ebrahimzadeh MH , Kachooei AR , Heidari H : Posterior surgery alone in the treatment of post-traumatic kyphosis by posterior column osteotomy, spondylodesis, instrumentation, and vertebroplasty . Asian Spine J 7 : 260 – 266 , 2013 24353841 10.4184/asj.2013.7.4.260 19 Park JH , Hyun SJ , Kim KJ , Jahng TA : Free hand insertion technique of S2 sacral alar-iliac screws for spino-pelvic fixation: technical note