Comparison of the bending performance of solid and cannulated spinal pedicle screws using finite element analyses and biomechanical tests

Shih, Kao Shang; Hsu, Ching‐Chi; Hou, Sheng; Yu, Shan Chuen; Liaw, Chen Kun

doi:10.1016/j.medengphy.2015.06.008

Cited by 21 publications

(14 citation statements)

References 26 publications

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“…On the contrary, when conical screws were compared, no meaningful difference was found between cannulated and conventional pedicle screws. [52] Therefore, in this study, only conical screws were used; as expected, no pull-out or broken screw-associated complications were observed in either group. The second main disadvantage is K-wire migration resulting in visceral organ or great vessel wounds.…”

Section: Discussionmentioning

confidence: 54%

Comparison of the accuracy of cannulated pedicle screw versus conventional pedicle screw in the treatment of adolescent idiopathic scoliosis

Yilar¹

2019

Medicine

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Background:Pedicle screws are commonly used to treat adolescent idiopathic scoliosis (AIS). Many studies have discussed the rates and effects of pedicle screw misplacement. In this study, to increase the accuracy rate, cannulated pedicle screws were inserted into the periapical vertebrae, highly rotated vertebrae, and vertebrae with very thin pedicles in a single patient group. We compared these results with those of a patient group who underwent conventional pedicle screw placement.Methods:Twenty-eight AIS patients treated surgically between 2015 and 2017 with cannulated pedicle screws or conventional pedicle screws were included. Group 1 (n = 15) received cannulated pedicle screws, whereas group 2 (n = 13) received conventional pedicle screws. Postoperative computed tomography scans were used to evaluate pedicle screw position. Pedicle perforation was assessed using the classification by Rao et al: grade 0, no perforation; grade 1, only the threads outside the pedicle (less than 2 mm); grade 2, core screw diameter outside the pedicle (2–4 mm); and grade 3, screw entirely outside the pedicle. Medial screw malposition was measured between the medial pedicle wall and the medial margin of the screw. Lateral screw malposition was measured between the lateral corpus wall and lateral screw margin.Results:Placement accuracy of 703 screws (group 1, 376; group 2, 327) was evaluated. A total of 142 (20.1%) pedicle screw perforations occurred: 63 (17.1%) in group 1 and 79 (25%) in group 2 (P < .05). There was no statistically significant intergroup difference in medial perforation (group 1, 34 [9%] vs group 2, 31 [10%]). Lateral perforation was significantly less common in group 1 (n = 29; 7.7%) than in group 2 (n = 4; 14.7%) (P = .0002).Conclusions:The use of cannulated screws to treat AIS decreases perforation and complication rates. Although it did not significantly lower the medial perforation rate, it dramatically reduced the lateral perforation rate. The use of cannulated screws enables intraoperative confirmation of placement accuracy. Our data suggest that cannulated pedicle screw use to treat AIS is safer and more efficient.

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Section: Discussionmentioning

confidence: 54%

Comparison of the accuracy of cannulated pedicle screw versus conventional pedicle screw in the treatment of adolescent idiopathic scoliosis

Yilar¹

2019

Medicine

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“…The MPO may represent a superior design compared with the SPO and LPO in seeking a balance between intersegmental rotation and cage stress. was found in the present study, a parametric study can only determine the local optimum design because design variables are usually divided into discrete levels [35]. To address this problem, previous studies applied numerical algorithms to optimize porous structures fabricated by selective laser melting [14,15].…”

Section: Discussionmentioning

confidence: 99%

Biomechanical investigation into the structural design of porous additive manufactured cages using numerical and experimental approaches

Tsai

Hsu

Chen

et al. 2016

Computers in Biology and Medicine

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“…We have not found any biomechanical studies on the stability of the iliac screws. Although the cannulated screws have been shown to be more fragile than conventional screws in a biomechanical study with pedicle screws [24], no weakness has been found in clinical studies [22,23]. To avoid any breakage problem while inserting a cannulated iliac screw, we sent the cannulated taper to the end and tried to bury it in the bone tissue with only the polyaxial part of the screw outside.…”

Section: Discussionmentioning

confidence: 99%

Safety and accuracy of cannulated versus non-cannulated iliac screws: Cohort study

Toy¹,

Yilar²,

Zencirli³

2020

Journal of Surgery and Medicine

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Ethics Committee Approval: Ethics committee approval was not received due to the retrospective design of the study. All procedures in this study involving human participants were performed in accordance with the 1964 Helsinki Declaration and its later amendments. Etik Kurul Onayı: Etik kurul onayı çalışmanın retrospektif dizaynından dolayı alınmamıştır. İnsan katılımcıların katıldığı çalışmalardaki tüm prosedürler, 1964 Helsinki Deklarasyonu ve daha sonra yapılan değişiklikler uyarınca gerçekleştirilmiştir.

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Comparison of the bending performance of solid and cannulated spinal pedicle screws using finite element analyses and biomechanical tests

Cited by 21 publications

References 26 publications

Comparison of the accuracy of cannulated pedicle screw versus conventional pedicle screw in the treatment of adolescent idiopathic scoliosis

Comparison of the accuracy of cannulated pedicle screw versus conventional pedicle screw in the treatment of adolescent idiopathic scoliosis

Biomechanical investigation into the structural design of porous additive manufactured cages using numerical and experimental approaches

Safety and accuracy of cannulated versus non-cannulated iliac screws: Cohort study

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