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Current concepts and applications of computer navigation in orthopedic trauma surgery

100%
Kendoff D., Citak M., Hüfner T., Chaudhary S., Krettek C.
Open Medicine
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2007
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vol. 2
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issue 4
392-403
EN
Navigation has become widely integrated into regular endoprosthetic procedures, but clinical use of navigation systems in orthopaedic trauma has only been implemented in a few indications. Navigation systems enable an accuracy of 1 mm or 1 degree. Navigation can achieve higher precision when it is combined with different imaging modalities, including preoperative computer tomography (CT), intraoperative CT, two-dimensional fluoroscopy, and, recently, intraoperative three-dimensional fluoroscopy. The precision of the navigation system can be influenced by the surgeon as well as by the camera system, type of reference marker, and the registration process. Recent developments in orthopedic trauma navigation allow for bilateral femoral anteversion measurements, noninvasive registration of an uninjured thigh, and intraoperative three-dimensional fluoroscopy-based pedicle screw placement. Although the use of navigation has provided initial positive results in trauma care, prospective clinical studies remain to be performed.
2
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Does work stress affect neurocognitive functions? Case of Moroccan workers

88%
Arji S., Elhaddadi M., Ahami A. O. T., Ziri R.
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EN
Depending on its stage, stress influences cognitive functions. Indeed, several authors have ensured the degradation of cognitive functions by stress. Others did not find any association between the two. A third group of authors claimed that stress improves the performance of certain cognitive functions. Faced with this inconsistency of results, we conducted this study with the aim of finding out whether job stress alters or stimulates cognitive functions. Our study focused on 102 workers who were asked to freely and anonymously complete a questionnaire deemed relevant at the international scale. The age of the participants is between 22 and 60 years old with an average of 37 years and a standard deviation of 11 years. The population is made up of 77% of men and 23% of women. For the school level of the subjects: 50% of the subjects have a level bac to bac+2, 30% have a level higher than bac+2 and 20% have a level lower than bac. The professional status of workers is divided into three types: 48% are supervisors and technicians, 32% are executing workers and 20% are senior managers. The participants underwent two neurocognitive tests using the ELIAN software. Analysis of the results shows that there is no significant link between work stress and the cognitive functions studied. However, the analysis of the results of each socio-professional category separately shows that stress significantly reduces the visual working memory score of young people (< 40 years old), as well as the ability to concentrate of subjects with a school level higher than bac+2. While it improves visual perception in men and old people over the age of 40. There are significant links between some cognitive performances and the socio-professional characteristics of the stressed subjects. Therefore, work stress can affect neurocognitive health, which is more serious. In order to understand the relationship between work or chronic stress and cognition as well as their moderating factors, it is advisable to increase the size of the sample and to diversify the cognitive functions studied as well as their tasks.
3
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MEASUREMENT SYSTEM FOR ASSESMENT OF MOTOR CYLINDER TOLERANCES AND ROUNDNESS

75%
Jermak C. J., Dereżyński J., Rucki M.
Metrology and Measurement Systems
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2018
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vol. 25
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issue 1
4
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Evaluation of some levelling techniques in surveying application

75%
Pırtı A., Hoşbaş R. G., Pırtı A., Hoşbaş R. G.
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issue 2
5
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Impact of target selection on front kick kinematics in taekwondo – pilot study

75%
Wąsik J., Góra T.
Physical Activity Review
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2016
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vol. 4
57-61
EN
Velocity and accuracy of strike are important factors that help in achieving victory. The question is if the target selection can have an impact on the strike kinematics. The topic is especially important in the case of the traditional taekwon-do, in which a single kick might decide who the winner is. The aim of the paper is knowledge about the influence of the target on the kinematic factors of the front kick technique. In this study, a Polish Taekwon-do Championship runner-up was examined. The taekwon-do athlete (age: 28 years; body mass: 68 kg; height: 172 cm) is holding a 2nd degree, Motion analysis and data processing was prepared in HML (Human Motion Lab) using 10 NIR Vicon MX-T40 cameras with the acquisition speed of 100 to 2000 frames per second at full frame resolution of 4 megapixels. During the research various measurements were collected to perform dimensional analysis of foot and knee movement, describing their velocity changes as a function of time. The following strike speeds were recorded. No physical target: dominant leg foot 12.25 ± 0.18 m/s, non-dominant leg foot 13,92 ± 0,87 m/s. Small ball target/Punching ball: dominant leg foot 10,27 ± 0,29 m/s, non-dominant leg foot 10,03 ± 0,15 m/s. Kicking Shield/Shield: dominant leg foot 11,17 ± 0,34 m/s, non-dominant leg foot 10,06 ± 0,46 m/s. The quickest strike was registered when the athlete had no physical target in front of him. No focus on the target caused the fastest results. The shield target provoked a stronger and slower strike, as the speed has been slightly slower than in the non-target situation. The velocity of the foot was reduced the most when the most precision was needed. Aiming into a little ball caused the biggest speed to decrease the most. The main conclusion is that the more precision is needed, the more speed decrease will be observed
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