scholarly journals Significant Increases in Sagittal Translation and Transverse Rotation of the Fibula Occur with Sequential Disruption of the Syndesmosis

2017 ◽  
Vol 33 (10) ◽  
pp. e131-e132
Author(s):  
Conor I. Murphy ◽  
Thomas Rudolf Pfeiffer ◽  
Jason P. Zlotnicki ◽  
Patrick J. Haggerty ◽  
Joseph Russell ◽  
...  
Keyword(s):  
Transverse Rotation

scholarly journals Brane with transverse rotation and background fields: boundary state and tachyon condensation

2020 ◽  
Vol 80 (7) ◽  
Author(s):  
Davoud Kamani
Keyword(s):  
String Theory ◽  
Tachyon Condensation ◽  
Internal Field ◽  
Open String ◽  
Bosonic String ◽  
Boundary State ◽  
Bosonic String Theory ◽  
Transverse Rotation ◽  
Background Fields

Abstract The boundary state corresponding to the Dp-brane with a transverse rotation in the presence of the Kalb–Ramond and tachyon background fields and a U(1) internal field will be constructed. We shall investigate effects of the open string tachyon condensation on this brane via its boundary state. We demonstrate that the background fields and transverse rotation cannot protect the brane against the collapse. Our calculations are in the context of the bosonic string theory.

scholarly journals Analysis of the Relative Motion Between the Socket and Residual Limb in Transtibial Amputees While Wearing a Transverse Rotation Adapter

2020 ◽  
pp. 1-9
Author(s):  
Corey A. Pew ◽  
Sarah A. Roelker ◽  
Glenn K. Klute ◽  
Richard R. Neptune
Keyword(s):  
Inverse Kinematic ◽  
External Loading ◽  
Shear Stresses ◽  
Transverse Displacement ◽  
Residual Limb ◽  
Limb Loading ◽  
Lower Limb Prosthesis ◽  
Kinematic Analyses ◽  
Transverse Rotation ◽  
Transtibial Amputees

The coupling between the residual limb and the lower-limb prosthesis is not rigid. As a result, external loading produces movement between the prosthesis and residual limb that can lead to undesirable soft-tissue shear stresses. As these stresses are difficult to measure, limb loading is commonly used as a surrogate. However, the relationship between limb loading and the displacements responsible for those stresses remains unknown. To better understand the limb motion within the socket, an inverse kinematic analysis was performed to estimate the motion between the socket and tibia for 10 individuals with a transtibial amputation performing walking and turning activities at 3 different speeds. The authors estimated the rotational stiffness of the limb-socket body to quantify the limb properties when coupled with the socket and highlight how this approach could help inform prosthetic prescriptions. Results showed that peak transverse displacement had a significant, linear relationship with peak transverse loading. Stiffness of the limb-socket body varied significantly between individuals, activities (walking and turning), and speeds. These results suggest that transverse limb loading can serve as a surrogate for residual-limb shear stress and that the setup of a prosthesis could be individually tailored using standard motion capture and inverse kinematic analyses.

scholarly journals Hindfoot Alignment Changes after Internal Fixation of Distal Tibial Fracture: Comparing Radiological and Clinical Outcomes of Patients Treated with Standard Plating vs Intramedullary Nailing

2019 ◽  
Vol 4 (4) ◽  
pp. 2473011419S0044
Author(s):  
Young Yi ◽  
Dong Il Chun ◽  
Jae-Ho Cho ◽  
Sung-Hun Won ◽  
Ja-hyung Kim
Keyword(s):  
Tibial Fracture ◽  
Distal Tibia ◽  
Fracture Site ◽  
Inclusion Criteria ◽  
Distal Tibial Fracture ◽  
Hindfoot Alignment ◽  
Tibia Fractures ◽  
Distal Tibia Fractures ◽  
Transverse Rotation ◽  
Foot Alignment

Category: Trauma Introduction/Purpose: Until now, many papers Traditionally concerned for union of the fracture, changes of alignment, clinical symptoms and complication. However, there are no studies on changes in foot alignment, hid foot and related clinical changes. The Purpose of this study to evaluate clinical outcome and radiological outcome including hind foot alignment using Plate versus IM nail fixation of distal tibia fracture and to evaluate influence factors of hindfoot alignment alteration among the radiologic parameters. Methods: Overall, 92 patients with distal tibial metaphyseal fractures (AO-OTA 43-A1, 43-A2) with simple or no articular involvement treated from 2002 to 2013. Among them, 39 cases of intramedullary nailing and 53 cases of standard plate osteosynthesis were performed. Inclusion criteria were applied for patient group. Union rate and complication rate compared both group. Radiographic measurements were evaluated at a minimum of 1-year follow-up. Radiological parameters of hindfoot angulation and moment arm were measured at the Saltzman view, calcaneal pitch angle and Meary angle were measured at the lateral standing radiograph. Hindfoot alignment changes after surgery were compared between both groups using student T-test. Alignment changes after fracture site union were evaluated simple radiograph and computed radiograph; coronal plane angulation, saggital plane angulation and transverse plane rotation were measured. Correlation and regression were analyzed between fracture alignment parameters and hindfoot alignment Results: We studied 92 patients with distal tibia fractures treated with IMN (39 patients) and SP (53 patients). 37 patients in the IMN group and 47 in the IMN group met inclusion criteria. All patients ultimately healed, with the average time to union of 26 weeks in both the groups. Complications were similar between the two groups. Hindfoot alignment angle, calcaneal pitch and Mearly angles showed no difference between the groups. But moment arm was increased valgus in the IMN group. Angulation at fracture site on the coronal and hindfoot alignment changes were showed low significant relationship(R=0.38). But transverse rotation and hindfoot alignment changes were showed high significant relationship(R=0.79). And only transverse rotation has a strong correlation with hindfoot alignment changes after regression analysis. Conclusion: Similar union rate and complication were seen when treating nonarticular metaphyseal distal tibia fractures with SP compared with IMN. Angulation on coronal plane after internal fixation may a little affect to change hindfoot alignment due to compensation on the subtalar joint. However, rotation on the transverse plane has intactly influenced hindfoot alignment alteration. Therefore, regardless of the fixed method, the patients treated distal tibial fracture required close attention to changes in hindfoot alignment due to transverse rotation during surgery.

scholarly journals IMPROVEMENT AND PERFORMANCE EVALUATION OF A SYSTEM FOR MONITORING ROTATIONS AND DISPLACEMENTS OF BRIDGES BASED ON LASER POINTER AND DIGITAL PHOTOGRAMMETRY

2019 ◽  
Vol XLII-2/W18 ◽  
pp. 1-5
Author(s):  
G. Artese
Keyword(s):  
Low Cost ◽  
Previous Method ◽  
Digital Photogrammetry ◽  
Laser Pointer ◽  
Generic Point ◽  
Elastic Line ◽  
High Brightness ◽  
Transverse Rotation ◽  
And Performance ◽  
The Individual

Abstract. A system for monitoring rotations and displacements of bridges based on laser pointer and digital photogrammetry is described. The system uses three common laser pointers and image processing. The inclination of the elastic line is measured by analysing the individual frames of an HD video of the laser beam footprint projected onto a flat target. The methodology, able to conjugate a high precision, low cost, and easiness of use, is an evolution of a method developed at University of Calabria, Italy. The use of three laser pointers allows to improve the performance of the previous method, obtaining both displacements and rotations at a generic point of the bridge deck, and deriving the transverse rotation of the deck cross section. The investigated method exploits the laser pointers’ property to provide a steady pointing direction, a long-range and a high-brightness visible imprint. The method and the results of an experimental test are described and discussed.

TRANSVERSE ROTATION OF THE SEGMENTS OF THE LOWER EXTREMITY IN LOCOMOTION

1948 ◽  
Vol 30 (4) ◽  
pp. 859-872 ◽  
Author(s):  
A. S. Levens ◽  
Verne T. Inman ◽  
J. A. Blosser
Keyword(s):  
Lower Extremity ◽  
Transverse Rotation

scholarly journals PARSEC-SCALE INVESTIGATION OF THE MAGNETIC FIELD STRUCTURE OF SEVERAL AGN JETS

2008 ◽  
Vol 17 (09) ◽  
pp. 1553-1560 ◽  
Author(s):  
S. P. O'SULLIVAN ◽  
D. C. GABUZDA
Keyword(s):  
Magnetic Field ◽  
Faraday Rotation ◽  
Reliable Determination ◽  
Long Baseline ◽  
Central Engine ◽  
Relativistic Jet ◽  
Rotation Measure ◽  
Transverse Rotation ◽  
Helical Magnetic Field ◽  
The Magnetic Field

Multi-frequency (4.6, 5, 5.5, 8, 8.8, 13, 15, 22 & 43 GHz) polarization observations of six "blazars" were obtained on the American Very Long Baseline Array (VLBA) over a 24-hr period on 2 July 2006. Observing at several frequencies, separated by short and long intervals, enabled reliable determination of the distribution of Faraday rotation on a range of scales. In all cases the magnitude of the RM increases in the higher frequency observations, implying that the electron density and/or magnetic field strength is increasing as we get closer to the central engine. After correcting for Faraday rotation, the polarization orientation in the jet is either parallel or perpendicular to the jet direction. A transverse rotation measure (RM) gradient was detected in the jet of 0954+658, providing evidence for the presence of a helical magnetic field surrounding the jet. For three of the sources (0954+658, 1418+546, 2200+420), the sign of the RM in the core region changes in different frequency-intervals, indicating that the line-of-sight component of the magnetic field is changing with distance from the base of the jet. We suggest an explanation for this in terms of bends in a relativistic jet surrounded by a helical magnetic field; where there is no clear evidence for pc-scale bends, the same effect can be explained by an accelerating/decelerating jet.

Sign in / Sign up

Export Citation Format

Share Document