Symposium on Static and Dynamic Spinal Implants: Are We Evaluating Them Appropriately? Effect of Tightening Torque on ASTM F1798 Axial Gripping Capacity

2012 ◽  
pp. 246-253
Author(s):  
Sasidhar Vadapalli ◽  
Daniel L. Woods
Keyword(s):  
Tightening Torque ◽  
Spinal Implants

Symposium on Static and Dynamic Spinal Implants: Are We Evaluating Them Appropriately? Effect of Tightening Torque on ASTM F1798 Axial Gripping Capacity

2012 ◽  
Vol 9 (2) ◽  
pp. 103502 ◽  
Author(s):  
Sasidhar Vadapalli ◽  
Daniel L. Woods ◽  
D. Spenciner ◽  
J. Graham ◽  
S. W. Dean
Keyword(s):  
Tightening Torque ◽  
Spinal Implants

Comparison of metal artifact reduction techniques in magnetic resonance imaging of carbon-reinforced PEEK and titanium spinal implants

2021 ◽  
pp. 028418512110290
Author(s):  
Georg Osterhoff ◽  
Florian A Huber ◽  
Laura C Graf ◽  
Ferdinand Erdlen ◽  
Hans-Christoph Pape ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Pedicle Screws ◽  
Artifact Reduction ◽  
Metal Artifact ◽  
Metal Artifact Reduction ◽  
Signal Loss ◽  
Resonance Imaging ◽  
Spinal Implants ◽  
Titanium Screws

Background Carbon-reinforced PEEK (C-FRP) implants are non-magnetic and have increasingly been used for the fixation of spinal instabilities. Purpose To compare the effect of different metal artifact reduction (MAR) techniques in magnetic resonance imaging (MRI) on titanium and C-FRP spinal implants. Material and Methods Rod-pedicle screw constructs were mounted on ovine cadaver spine specimens and instrumented with either eight titanium pedicle screws or pedicle screws made of C-FRP and marked with an ultrathin titanium shell. MR scans were performed of each configuration on a 3-T scanner. MR sequences included transaxial conventional T1-weighted turbo spin echo (TSE) sequences, T2-weighted TSE, and short-tau inversion recovery (STIR) sequences and two different MAR-techniques: high-bandwidth (HB) and view-angle-tilting (VAT) with slice encoding for metal artifact correction (SEMAC). Metal artifact degree was assessed by qualitative and quantitative measures. Results There was a much stronger effect on artifact reduction with using C-FRP implants compared to using specific MRI MAR-techniques (screw shank: P < 0.001; screw tulip: P < 0.001; rod: P < 0.001). VAT-SEMAC sequences were able to reduce screw-related signal loss artifacts in constructs with titanium screws to a certain degree. Constructs with C-FRP screws showed less artifact-related implant diameter amplification when compared to constructs with titanium screws ( P < 0.001). Conclusion Constructs with C-FRP screws are associated with significantly less artifacts compared to constructs with titanium screws including dedicated MAR techniques. Artifact-reducing sequences are able to reduce implant-related artifacts. This effect is stronger in constructs with titanium screws than in constructs with C-FRP screws.

scholarly journals Postoperative spinal infection mimicking systemic vasculitis with titanium-spinal implants

Scoliosis ◽  
2011 ◽  
Vol 6 (1) ◽  
Author(s):  
Vasileios I Sakellariou ◽  
Erato Atsali ◽  
Konstantinos Starantzis ◽  
Chrysanthi Batistaki ◽  
Triantafyllia Brozou ◽  
...  
Keyword(s):  
Systemic Vasculitis ◽  
Spinal Infection ◽  
Spinal Implants

Design and Application of the FROMO® Preload Nut

2012 ◽  
Vol 538-541 ◽  
pp. 2718-2721
Author(s):  
Ying Liu ◽  
Jian Chu Shen
Keyword(s):  
Tensile Stress ◽  
Screw Thread ◽  
Tightening Torque ◽  
Tightening Force ◽  
Large Size ◽  
Design And Application

The design of a new pre-tensional structure(FROMO® preload nut) applied in the large size of screw thread was introduced, the preload bolt is only beared with the pure tensile stress. The pre-tightening force for the preload bolt and pre-tightening torque for the jack bolts were calculated. The practice elongation value of the preload bolt was measured, and compared with its theoretical elongation value. The result shows that: the new pre-tensional structure has adequate strength, it can control the pre-tightening force accurately with manual acting spanner, it increases efficiency and ensures the safety of operating , and which has promised the good performance in the application of the projects.

Ultrastructural Analysis of Metallic Debris and Tissue Reaction Around Spinal Implants in Patients With Late Operative Site Pain

Spine ◽  
2004 ◽  
Vol 29 (15) ◽  
pp. 1618-1623 ◽  
Author(s):  
Hakan Senaran ◽  
Pergin Atilla ◽  
Figen Kaymaz ◽  
Emre Acaroglu ◽  
Adil Surat
Keyword(s):  
Tissue Reaction ◽  
Ultrastructural Analysis ◽  
Operative Site ◽  
Spinal Implants ◽  
Site Pain

Airport Screening and Spinal Implants

2012 ◽  
Vol 78 (5) ◽  
pp. 387
Author(s):  
Kevin S. Cahill ◽  
Michael Y. Wang
Keyword(s):  
Spinal Implants
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