scholarly journals Combined 3D Printed Template to Guide Iliosacral Screw Insertion for Sacral Fracture and Dislocation: A Retrospective Analysis

2020 ◽  
Vol 12 (1) ◽  
pp. 241-247
Author(s):  
Chao Wu ◽  
Jia‐yan Deng ◽  
Tao Li ◽  
Lun Tan ◽  
De‐chao Yuan
Keyword(s):  
Retrospective Analysis ◽  
Sacral Fracture ◽  
Iliosacral Screw ◽  
Screw Insertion ◽  
3D Printed

scholarly journals A Retrospective Analysis of S2 Iliosacral Screw Fixation Using Robot-Assisted Navigation for Unstable Pelvic Injuries and Sacral Dysmorphism: a Report of 16 Cases

10.29007/nppx ◽  
2018 ◽  
Author(s):  
Wang Junqiang ◽  
Han Wei ◽  
Zhang Teng ◽  
Su Yonggang ◽  
Wu Xinbao ◽  
...  
Keyword(s):  
Retrospective Analysis ◽  
Screw Fixation ◽  
Pelvic Ring ◽  
Guide Wire ◽  
Operation Time ◽  
High Rate ◽  
Iliosacral Screw ◽  
Robot Assisted ◽  
Assisted Navigation ◽  
Screw Insertion

Objective The second sacral segment iliosacral screw (S2 screw) insertion is a demanding technique, with a high rate of screw malposition due to the complex pelvic anatomy. TiRobot™ is an orthopedic surgery robot which can be used for S2 screw fixation. We carried out a retrospective analysis of the accuracy of S2 screws using robot-assisted navigation.Methods A retrospective analysis of 16 patients admitted and managed by S2 screw fixation for unstable pelvic fractures was carried out for evaluation of its efficacy and safety. all patients with pelvic ring disruptions and sacral dysmorphism were evaluated radiographically and S2 screws were placed using a robot-assisted navigation technique. Screw position was assessed and classified using postoperative computed tomography. Fisher’s exact probabilities test was used to analyse the screws’ positions. Surgical time after reduction of the pelvis, insertion time for guide wire, number of guide wire attempts, and radiation exposure without pelvic reduction were also assessed.Results The excellent and good rate of screw placement was 100%. The fluoroscopy time after pelvic reduction was 7 (7, 9) seconds. The operation time after reduction of the pelvis was 29 (27,33). Time for guide wire insertion was 2.0 (2, 2) minutes. The number of guide wire attempts was 0.0 (0, 0). No postoperative complications or revisions were reported.Conclusion S2 iliosacral screws can be safely and accurately accomplished using a robot-assisted navigation technique in patients with unstable posterior pelvic ring disruptions and sacral dysmorphism.

scholarly journals 3D-Customized Guiding Template for Posterior Fixation in Complex Atlantoaxial Instability—Preliminary Experiences of National Cheng Kung University Hospital

2020 ◽  
Vol 81 (01) ◽  
pp. e20-e27
Author(s):  
Yi-Yun Chen ◽  
Liang-Chun Chao ◽  
Jing-Jing Fang ◽  
E-Jian Lee
Keyword(s):  
Three Dimensional ◽  
University Hospital ◽  
Atlantoaxial Instability ◽  
Posterior Fixation ◽  
Screw Insertion ◽  
Anatomical Abnormality ◽  
Spine Model ◽  
Atlantoaxial Fixation ◽  
3D Printed ◽  
Complex Cases

Objective Atlantoaxial fixation is technically demanding and challenging, especially in cases with anatomical abnormality. The purpose of this study is to report the effectiveness of the three-dimensional (3D)-customized guiding template for placement of C1 and C2 screws in cases with abnormalities. Method Two patients with anatomical abnormality and one without were included. The preoperative computed tomography (CT) image was analyzed using our software. The entry point, trajectory, and depth of the screws were designed based on these images. Templates with screw guiding cylinders and cervical spine model were created. In operation, guiding templates were applied directly to the laminae. Drilling, tapping, and screwing were performed through the cylinders. To evaluate the accuracy, deviation of the screw axis from the preplanned trajectory was measured on postoperative CT. A classification system was taking to evaluate the pedicle screw insertion. Results In complex cases, one of C2 screws has grade 2 deviation, and two has grade 1. There was no deviation in screws of C1. All patients achieved symptoms free after 6 months follow-up. Conclusion Although 3D-printed template for atlantoaxial fixation still has limitation in complex cases, it has been proved usefulness and makes the most difficult and dangerous spinal posterior fixation easy to achieve.

scholarly journals A Retrospective Analysis of System Engineering Data Collection Metrics for a 3D Printed UAS Design

2019 ◽  
Vol 153 ◽  
pp. 1-8
Author(s):  
Simon W Miller ◽  
Michael A Yukish ◽  
Meghan E Hoskins ◽  
Lorri A Bennett ◽  
Eric J Little
Keyword(s):  
Data Collection ◽  
Retrospective Analysis ◽  
System Engineering ◽  
Engineering Data ◽  
3D Printed

Anterior Transpedicle Screw in Lumbosacral Spine and Radiographic Measurements: A Retrospective Analysis

2020 ◽  
Author(s):  
Wei-Xing Xu ◽  
Wei-Guo Ding ◽  
Bin Xu ◽  
Hong-Feng Sheng ◽  
Di Lu ◽  
...  
Keyword(s):  
Retrospective Analysis ◽  
Pedicle Screw ◽  
Interbody Fusion ◽  
Lumbosacral Spine ◽  
Screw Insertion ◽  
Radiographic Measurements ◽  
Computed Tomography Scans ◽  
Safe Operating ◽  
Anatomical Area ◽  
Trajectory Angle

Abstract Background The anterior transpedicle screw technique for L5 and S1 is crucial for proper anterior lumbar interbody fusion. This study aimed to determine the projection, screw trajectory angle, and bone screw passageway length (BSPL) of the anterior transpedicle screw in L5 and S1, as well as the screw’s insertion regularity and the operating area that is safe for its insertion. Methods Forty patients with low back pain, all of whom had lumbar computed tomography scans available, were included in a retrospective analysis. Radiographic parameters were measured, including the distances from the projection to the upper endplate, lower endplate, and midline; the transverse and sagittal screws’ angles; and the BSPL. Ten fresh adult cadaveric lumbosacral spine segments were chosen to determine the safe anatomical area at which to operate. Finally, anterior transpedicle screws were inserted in L5 and S1 to determine the regularity of anterior pedicle screw insertion. Results We measured the anterior projection parameters, including the distances to the upper endplate (L5:12.5 ± 1.3 mm; S1: 4.54 ± 0.87 mm), lower endplate (L5: 17.3 ± 1.6 mm), and midline (L5: 6.6 ± 0.7 mm; S1: 6.6 ± 0.6 mm); the screw trajectory angle, including the transverse screw angle (L5: 25.3° ± 2.8°; S1: 25.7° ± 2.6°), sagittal screw angle (L5: 17.1° ± 1.7°; S1: 22.4° ± 1.1°); and the BSPL (L5: 48.6 ± 3.5 mm; S1: 48.0 ± 3.5 mm). We then identified the safe operating area and the regularity of L5 and S1 anterior pedicle screw insertions. Conclusions We determined the projection, screw trajectory angle, and BSPL of anterior transpedicle screws in L5 and S1, their insertion regularity, and the area in which the operation could be safely performed.

Factors influencing the accuracy of iliosacral screw insertion using 3D fluoroscopic navigation

2018 ◽  
Vol 139 (2) ◽  
pp. 189-195 ◽  
Author(s):  
Masaki Takao ◽  
Hidetoshi Hamada ◽  
Takashi Sakai ◽  
Nobuhiko Sugano
Keyword(s):  
Iliosacral Screw ◽  
Screw Insertion ◽  
Factors Influencing ◽  
Fluoroscopic Navigation

CT-3D-Fluoroscopy Matching Navigation Can Reduce the Malposition Rate of Iliosacral Screw Insertion for Less-Experienced Surgeons

2013 ◽  
Vol 27 (12) ◽  
pp. 716-721 ◽  
Author(s):  
Masaki Takao ◽  
Takashi Nishii ◽  
Takashi Sakai ◽  
Nobuhiko Sugano
Keyword(s):  
Iliosacral Screw ◽  
Screw Insertion ◽  
3D Fluoroscopy

scholarly journals Sacral Fracture Nonunion Treated by Bone Grafting through a Posterior Approach

2013 ◽  
Vol 2013 ◽  
pp. 1-4 ◽  
Author(s):  
Sang Yang Lee ◽  
Takahiro Niikura ◽  
Yoshitada Sakai ◽  
Masahiko Miwa ◽  
Kotaro Nishida ◽  
...  
Keyword(s):  
Bone Grafting ◽  
Initial Treatment ◽  
Posterior Approach ◽  
Sacral Fracture ◽  
Iliosacral Screw ◽  
Ct Guided ◽  
Nerve Root Injury ◽  
Fracture Nonunion ◽  
Fracture Nonunions ◽  
Grafting Through

Nonunion of a sacral fracture is a rare but serious clinical condition which can cause severe chronic pain, discomfort while sitting, and significant restriction of the level of activities. Fracture nonunions reportedly occur most often after nonoperative initial treatment or inappropriate operative treatment. We report a case of fracture nonunion of the sacrum and pubic rami that resulted from non-operative initial treatment, which was treated successfully using bone grafting through a posterior approach and CT-guided percutaneous iliosacral screw fixation combined with anterior external fixation. Although autologous bone grafting has been the gold standard for the treatment of pelvic fracture nonunions, little has been written describing the approach. We utilized a posterior approach for bone grafting, which could allow direct visualization of the nonunion site and preclude nerve root injury. By this procedure, we were able to obtain the healing of fracture nonunion, leading to pain relief and functional recovery.

scholarly journals Assessment of a percutaneous iliosacral screw insertion simulator

2009 ◽  
Vol 95 (7) ◽  
pp. 471-477 ◽  
Author(s):  
J. Tonetti ◽  
L. Vadcard ◽  
P. Girard ◽  
M. Dubois ◽  
P. Merloz ◽  
...  
Keyword(s):  
Iliosacral Screw ◽  
Screw Insertion
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