scholarly journals "Free-hand" technique for thoracolumbar pedicle screw instrumentation: Critical appraisal of current "State-of-Art"

2009 ◽  
Vol 57 (6) ◽  
pp. 715 ◽  
Author(s):  
TobiasA Mattei ◽  
MuriloS Meneses ◽  
JeronimoB Milano ◽  
Ricardo Ramina
Keyword(s):  
Pedicle Screw ◽  
Critical Appraisal ◽  
Pedicle Screw Instrumentation ◽  
Current State ◽  
Free Hand Technique ◽  
State Of Art

scholarly journals Implementing “Free-Hand” Technique Training for Pedicle Screw Instrumentation in Neurosurgical Residency

2018 ◽  
Vol 21 (2) ◽  
pp. 80-87
Author(s):  
Tobias Alécio Mattei ◽  
Murilo Sousa De Meneses ◽  
Jerônimo Buzetti Milano ◽  
Ricardo Ramina ◽  
Conrado Regis Borges
Keyword(s):  
Pedicle Screw ◽  
Thoracolumbar Spine ◽  
Pedicle Screws ◽  
Cost Effective ◽  
Training Methods ◽  
Educational Models ◽  
Educational Method ◽  
Pedicle Screw Instrumentation ◽  
Free Hand Technique ◽  
Interdisciplinary Partnership

Introduction: The anatomical studies conducted in recent decades made possible the emergence of “free-hand” technique for pedicle screw instrumentation of the thoracic-lumbar spine based solely on anatomical parameters. However, the potential risks associated with such technique revealed the immediate need to create educational models for surgical training. Methods: After an interdisciplinary partnership, two anatomicspecimens were submitted to instrumentation of the thoracolumbar spine. In the sequence they were submitted to fine-slice CT-scan, and, finally, to the decompression of the lumbar spinal canal in order to verify the accuracy pedicle screw placement both on the anatomical and radiological level. Results: Overall, 28 intact vertebral bodies were instrumented (T5-S1) in two specimens (a total amount of 62 pedicle screws). Overall, there were only four critical perforations. Considering the accuracy rates for each specimen separately, the number of violations decreased from the first (32% of misplaced screws) to the second instrumented specimens (25%). A more surprising learning curve was noted when considering the lower thoracic spine separately (37,5% versus 12,5%). Conclusions: The authors demonstrate that incorporating the training of pedicle screw instrumentation in routine neurosurgical residency is a cost-effective educational method, which enables young neurosurgeons to practice these skills in the laboratory before  proceeding to the operating room.

scholarly journals Breach Rate Analysis of Pedicle Screw Instrumentation using Free-Hand Technique in the Surgical Correction of Adolescent Idiopathic Scoliosis

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Didik Librianto ◽  
Ifran Saleh ◽  
Fachrisal Saleh ◽  
Widyastuti Srie Utami ◽  
Witantra Dhamar Hutami
Keyword(s):  
Adolescent Idiopathic Scoliosis ◽  
Idiopathic Scoliosis ◽  
Pedicle Screw ◽  
Lumbar Vertebrae ◽  
Pedicle Screws ◽  
Surgical Correction ◽  
Low Grade ◽  
Pedicle Screw Instrumentation ◽  
Rate Analysis ◽  
Free Hand Technique

Introduction: Free-hand technique is one of the techniques used by spine surgeon during pedicle screw instrumentation of surgical correction of spinal deformities, including scoliosis. The previous studies showed that this technique is safe. However, some inherent factors may influence its outcomes, including screw breaching which is potentially violates spinal cord and other intimate structures. To con?rm the safety and accuracy of this technique, additional study measuring the breach rate of pedicle screw placement in scoliosis is mandatory. Materials and Methods: We performed a retrospective study of patients with adolescent idiopathic scoliosis (AIS) from Fatmawati General Hospital, Jakarta, treated for surgical correction during a period of 2017–2018 using free-hand technique for pedicle screw instrumentation. Post-operative computed tomography scan (CT scan) was analyzed to measure the medial and lateral breaches. P < 0.05 was deemed to be statistically significant. Results: A total of 94 pedicle screws from six female patients with AIS were included in our study. Overall breach occurred in 33% instrumented screws, the majority of it was a low-grade breach. Of the breached screws, medial and lateral breach occurred in 20% and 12% of screws, respectively. There were no differences in the overall, medial, and lateral breaches between thoracic and lumbar vertebrae (P > 0.05). Medial breach was significantly higher in middle thoracic segment compared to other thoracic segments (P = 0.048). Risk of medial breach was 3 times higher in the convex side of deformity (P = 0.012), whereas risk of lateral breach was 4.6 times higher in the concave side of the deformity (P = 0.021). Conclusion: The majority of breached screws were low-grade violation within the safe zone, with no neurological sequelae. Our study found that free-hand technique is safe and effective method of pedicle screw instrumentation for correction of AIS. Some inherent factors may influence the risk of

scholarly journals Endoscopic Spine Surgery: Current State of Art and the Future Perspective

2018 ◽  
Vol 12 (1) ◽  
pp. 1-2 ◽  
Author(s):  
Andrew Seok Min Moon ◽  
Sakthivel Rajan Rajaram Manoharan
Keyword(s):  
Spine Surgery ◽  
Future Perspective ◽  
Endoscopic Spine Surgery ◽  
Current State ◽  
The Future ◽  
State Of Art

scholarly journals The Progress in Photoacoustic and Laser Ultrasonic Tomographic Imaging for Biomedicine and Industry: A Review

2018 ◽  
Vol 8 (10) ◽  
pp. 1931 ◽  
Author(s):  
Anton Bychkov ◽  
Varvara Simonova ◽  
Vasily Zarubin ◽  
Elena Cherepetskaya ◽  
Alexander Karabutov
Keyword(s):  
Ultrasonic Imaging ◽  
Tomographic Imaging ◽  
Current Paper ◽  
Laser Ultrasonic ◽  
Biological Objects ◽  
Current State ◽  
State Of Art

The current paper reviews a set of principles and applications of photoacoustic and laser ultrasonic imaging, developed in the Laser Optoacoustic Laboratories of ILIT RAS, NUST MISiS, and ILC MSU. These applications include combined photoacoustic and laser ultrasonic imaging for biological objects, and tomographic laser ultrasonic imaging of solids. Principles, algorithms, resolution of the developed methods, and related problems are discussed. The review is written in context of the current state-of-art of photoacoustic and laser ultrasonic imaging.

scholarly journals CONTINUED FRACTIONS, INTERMEDIATE FRACTIONS AND THEIR RELATION TO THE BEST APPROXIMATIONS

2020 ◽  
Vol 20 (3) ◽  
pp. 545-560
Author(s):  
LUKA MILINKOVIC ◽  
BRANKO MALESEVIC ◽  
BOJAN BANJAC
Keyword(s):  
Continued Fractions ◽  
Continued Fraction ◽  
Rational Approximations ◽  
Best Approximations ◽  
Current State ◽  
The Subject ◽  
State Of Art

The subject of this paper is the current state of art in theory of continued fractions, intermediate fractions and their relation to the best rational approximations of the first and second kind. The paper provides an overview of the some well known and even some new properties of continued fractions, and the various terms associated with them. In addition to intermediate fractions, paper considers the fine intermediate fractions and gave some statements to position these fractions in the continued fraction representation of numbers.

scholarly journals Chitosan Applications on Pharmaceutical Sciences: A Review

2019 ◽  
Vol 9 (3) ◽  
pp. 167-181
Author(s):  
Cintia Alejandra Briones Nieva ◽  
Mercedes Villegas ◽  
Alicia Graciela Cid ◽  
Analía Irma Romero ◽  
José María Bermúdez
Keyword(s):  
New Technologies ◽  
Immunological Response ◽  
Biological Properties ◽  
Future Research ◽  
Pharmaceutical Sciences ◽  
Chemical Derivatization ◽  
Current State ◽  
Pharmaceutical Applications ◽  
Novel Applications ◽  
State Of Art

Background: Chitosan (CS) is a biomaterial derived from chitin, known for its excellent biological properties. One of the most interesting features of CS is its potential for chemical derivatization, which makes it a versatile material and allows to expand its applications. In the last years, the interest on this polymer and its pharmaceutical applications has notably increased. This biopolymer is being widely studied for its interesting properties, such as bioadhesion, antimicrobial activity, biocompatibility, and biodegradability. Other promising properties of CS include its modulation of immunological response, hemostasis, and wound and bone healing activity. Objective: In this work, a critical review is performed covering its conventional and novel applications, specially focused on pharmaceutical area, providing a clear picture of the current state of art to serve as a basis to direct future research in this field. Conclusion: Despite all the qualities of this polymer, there are only few CS-based products in the market, so it is a priority to enhance the research to develop new technologies and CS-based systems to enforce this biopolymer in the industry.

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