scholarly journals Improving Strength and Quality of Epitendinous Repairs

Hand ◽  
2018 ◽  
Vol 15 (4) ◽  
pp. 495-501
Author(s):  
Angel Farinas ◽  
Michael Stephanides ◽  
Steven Schneeberger ◽  
Alonda Pollins ◽  
Nancy Cardwell ◽  
...  
Keyword(s):  
Factor Analysis ◽  
Analysis Of Variance ◽  
Statistical Significance ◽  
Single Factor ◽  
Single Thread ◽  
A2 Pulley ◽  
Suture Thread ◽  
Single Factor Analysis ◽  
Single Suture

Background: Epitendinous sutures not only join the 2 severed tendon edges but also supply strength and support to the repair. Multiple techniques have been described, but none of them include another thread of suture. This could potentially increase the strength of the repair without affecting gliding. Methods: Caprine tendons were harvested, transected, and sutured with 6-0 Prolene. Four groups were created: single thread running (SR), single thread locking (SL), double thread running (DR), and double thread locking (DL). An Instron 5542 was used to pull the repaired tendons apart, and the energy at the break was calculated (gf/mm). For gliding resistance, we harvested a human A2 pulley. A pre- and postrepair value was obtained, and a ratio was elaborated. A single-factor analysis of variance and independent sample t tests were performed. Results: The SR group had a mean energy at break of 9339.71 ± 1630.212 gf/mm; the SL group, 9629.96 ± 1476.45 gf/mm; and the DR group, 9600.221 ± 976.087 gf/mm, with no statistical significance. The DL group was significantly higher at 14 740.664 ± 2596.586 gf/mm ( P < .05). When comparing SR with DL for gliding, SR had less than half of the resistance than DL (0.018 ± 0.004 and 0.049 ± 0.015 N/mm, respectively), with statistical significance ( P < .05). Conclusion: Using a single suture thread for running epitendinous repair is no different than locking with a single thread or using an extra thread in a running fashion. Performing a double suture thread with a locking technique is significantly stronger than the previously mentioned repairs, with the disadvantage of more resistance at the pulley.

scholarly journals Investigation of Influence ofa New Twist Intensifier on the Properties of the Twisted Yarn

2021 ◽  
Vol 12 (5) ◽  
pp. 1943-1949
Author(s):  
Yuldashev Alisher Tursunbayevich, Et. al.
Keyword(s):  
Tensile Strength ◽  
Factor Analysis ◽  
Uniform Distribution ◽  
Statistical Methods ◽  
Quality Parameters ◽  
Single Factor ◽  
Rotor Spinning ◽  
Twisted Yarn ◽  
Single Factor Analysis

The article is devoted to the study of the properties of the yarn obtained by the methods of ring and rotor spinning, for twisted yarn, produced on a VTS-09 double twist machine made by Volkmann (Germany). Experiments were carried out on two typesof spinning yarns with yarn counts Ne 20/2 and 12/2 in the existing design (control) and the new design, flexible element with equal tension and twist intensifier and compared the effects of the resulting twisted yarn for quality parameters. Mathematical statistical methods (single-factor analysis of variance) were used to assess the quality of twisted yarn. Experiments have shown that the use of a new design nozzle reduces the vibration of the yarn, which leads to a uniform distribution of twists along the length of the twisted yarn, increases its tensile strength and improves the quality of the twisted yarn.

Research on Self-Propelled High Spray Machine Steel Stamping Forming

2013 ◽  
Vol 670 ◽  
pp. 128-136
Author(s):  
R.H. Zhang ◽  
H. Miao
Keyword(s):  
Factor Analysis ◽  
Friction Coefficient ◽  
Single Factor ◽  
Actual Production ◽  
Orthogonal Experiments ◽  
Machine Steel ◽  
Single Factor Analysis ◽  
The Impact ◽  
Process Combination

In this paper through simulation a single factor analysis and research four parameters of Self-propelled high Spray Machine steel stamping forming ,including die gap(), die radius(r), friction coefficient(f) and drawbead height(h), on the impact of sheet forming. Considering the defects of steel forming in the actual production, the most important parameters is determined and four parameters and three level orthogonal experiments are carried out. The drawbead height (h) is the most important parameter affecting in steel forming that should be strictly controlled in the actual production. The die gap () is secondary. The die radius (r) and the friction coefficient (f) affect the least. In order to improve the quality of stamping, the3r2f3h3 process combination should be adopted, which provided some theoretical guidance in actual production

scholarly journals The morphometric characters variability analysis of Tulipa uniflora (Liliaceae) in the Angara Region (Irkutsk Oblast, Russia)

2018 ◽  
Vol 11 ◽  
pp. 00009
Author(s):  
Olga Chernysheva ◽  
Yuriy Bukin ◽  
Denis Krivenko
Keyword(s):  
Factor Analysis ◽  
Analysis Of Variance ◽  
Morphometric Parameters ◽  
Single Factor ◽  
Morphometric Characters ◽  
Interpopulation Variability ◽  
Significant Difference ◽  
Single Factor Analysis ◽  
Components Method ◽  
The One

The intra-and interpopulation variability of six populations of Tulipa uniflora (L.) Besser ex Baker at the northern limit of distribution in the Angara steppes over 12 morphometric parameters was studied by the principal components method and single-factor analysis of variance. It is established that the vectors characterizing the gradients of the change in the morphometric parameters are divided into two groups: vegetative and generative, which are among themselves in direct dependence. Based on the single-factor analysis of variance results for all morphometric parameters, a significant difference is observed between populations of T. uniflora in the Angara Region. On the one hand, this is a consequence of anthropogenic impact on the population, and on the other – the relic nature of the species.

scholarly journals PREDICTION OF MULTIPLE SCLEROSIS COURSE: RESULTS OF PROSPECTIVE STUDY

2020 ◽  
Vol 20 (1) ◽  
pp. 126-129
Author(s):  
O.D. Shulga
Keyword(s):  
Multiple Sclerosis ◽  
Factor Analysis ◽  
Analysis Of Variance ◽  
Functional Disability ◽  
Influential Factor ◽  
Expanded Disability Status Scale ◽  
Single Factor ◽  
Disability Status ◽  
Single Factor Analysis

Background: The course of multiple sclerosis is variable and unpredictable. Despite considerable efforts and research over the decades, one of the major challenges for both neurologists and patients is still to determine the prognosis of multiple sclerosis as well as the factors and markers affecting its progression. Prospective studies can partially contribute to assessment of the factors predetermining the prognosis of the course of multiple sclerosis. Objective: To evaluate the factors affecting the course of multiple sclerosis according to a 5-year prospective dynamic observation. Materials and methods: 175 patients with multiple sclerosis were examined over a 5-year follow-up period. The methodology employed was as follows: statistical analysis by using Microsoft Excel for Windows and SPSS; standard descriptive statistics; calculation of Pearson's chi-square for categorical analysis; single-factor analysis of variance. The magnitude and directivity of the correlation dependence were estimated using the Spearman non-parametric correlation coefficient. Results: 175 patients with multiple sclerosis (123 women and 52 men) were examined over a 5-year follow-up period. Mean age of patients at the onset of multiple sclerosis was 28.46 ± 9.13 years; mean age at the time of diagnosis of the disease was 31.77 ± 9.28 years; the mean length of the disease was 15.48 ± 7.69 years prior the start of the observation. At the time of the patients’ status assessment in 2013, the Expanded Disability Status Scale value was 3.83 ± 1.68 scores and 4.21 ± 1.83 scores in 5 years. The degree of functional disability according to the Expanded Disability Status Scale baseline was statistically significant (p = 0.02). A single-factor analysis of variance showed that sex (p <0.007) was of the highest significance for the degree of difference by the Expanded Disability Status Scale. Conclusions: According to results obtained, we can suggest the most influential factor for a patient's disability due to multiple sclerosis is sex. Men may develop multiple sclerosis at younger age, the disease in men progresses faster, thus, the degree of functional disability is higher compared with women.

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