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Title:

Free temporal fascia flap to cover soft tissue defects of the foot: a case report ; Der freie Temporalisfaszienlappen zur Defektdeckung am Fußrücken

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Severe soft tissue defects as a result of lye contamination remain a huge challenge in the interdisciplinary approach of trauma surgeons and plastic surgeons. Free tissue transfer is a suitable surgical option for successful reconstruction of form and function of defects in the distal parts of the lower extremities. We report the successful two-...

Severe soft tissue defects as a result of lye contamination remain a huge challenge in the interdisciplinary approach of trauma surgeons and plastic surgeons. Free tissue transfer is a suitable surgical option for successful reconstruction of form and function of defects in the distal parts of the lower extremities. We report the successful two-stage reconstruction of a full thickness lye contamination at the dorsum of the foot with a free temporoparietal fascia flap covered with a split-thickness skin graft from the thigh. The described method is a suitable operative alternative to anterolateral thigh flaps or other thin fascia flaps regarding flap harvest and donor site morbidity and should be considered in the portfolio of the plastic surgeon. ; Laugenverätzungen am Vorfuß sind eine häufige Ursache für schwere Schädigungen der Weichteile an einer sensiblen Lokalisation dar. Aufgrund der tiefgehenden Kolliquationsnekrose erfordern diese Verletzungen oft den freien mikrochirurgischen Gewebetransfer. Im Falle einer drittgradigen Laugenverätzung des Vorfußes mit freiliegendem Sehnengewebe ist die zweizeitige Rekonstruktion durch adäquates Debridement und definitive Defektdeckung durch die freie mikrovaskulär anastomosierte Temporalisfaszienlappenplastik mit gleichzeitiger Spalthauttransplantation eine gute Alternative zur ALT-Lappenplastik oder anderen dünnen Faszienlappen. Aufgrund der sicheren Präparation sowie der geringen Hebemorbidität eignet sich die hier vorgestellte Methode sehr gut zur Defektdeckung am Fußrücken. Minimize

Publisher:

German Medical Science GMS Publishing House; Düsseldorf

Year of Publication:

2015-01-13

Source:

GMS Interdisciplinary Plastic and Reconstructive Surgery DGPW

GMS Interdisciplinary Plastic and Reconstructive Surgery DGPW Minimize

Document Type:

article

Language:

eng

Subjects:

temporoparietal fascia flap ; flap reconstruction and foot ; reconstruction foot ; lye acid surgery ; flap reconstruction ; defect lower extremities ; trauma foot ; Temporalisfaszienlappen ; Rekonstruktion Defektwunden Fuß ; Lappenplastik Fuß ; Laugenverätzung ; Lappenplastik ; Defektwunden untere Extremität ; Trauma Fuß ; ddc:610

temporoparietal fascia flap ; flap reconstruction and foot ; reconstruction foot ; lye acid surgery ; flap reconstruction ; defect lower extremities ; trauma foot ; Temporalisfaszienlappen ; Rekonstruktion Defektwunden Fuß ; Lappenplastik Fuß ; Laugenverätzung ; Lappenplastik ; Defektwunden untere Extremität ; Trauma Fuß ; ddc:610 Minimize

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http://www.egms.de/en/terms.htm

http://www.egms.de/en/terms.htm Minimize

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Dhamangaonkar AC, Patankar HS. Reverse sural fasciocutaneous flap with a cutaneous pedicle to cover distal lower limb soft tissue defects: experience of 109 clinical cases. J Orthop Traumatol. 2014 Sep;15(3):225-9. DOI: 10.1007/s10195-014-0304-0 ; Duteille F, Sartre JY, Perrot P, Gouin F, Pannier M. Particularités de la couverture des pertes de...

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Title:

Strongly correlated electron system in the magnetic field

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The energy spectrum of the two-dimensional t-J model in a perpendicular magnetic field is investigated. The density of states at the Fermi level as a function of the inverse magnetic field $\frac{1}{B}$ reveals oscillations in the range of hole concentrations $0.08<x<0.18$. In the used approximation zero-field Fermi surfaces are large for these ...

The energy spectrum of the two-dimensional t-J model in a perpendicular magnetic field is investigated. The density of states at the Fermi level as a function of the inverse magnetic field $\frac{1}{B}$ reveals oscillations in the range of hole concentrations $0.08<x<0.18$. In the used approximation zero-field Fermi surfaces are large for these $x$, and oscillation frequencies conform with such Fermi surfaces. However, the amplitude of these oscillations is modulated with a frequency which is smaller by an order of magnitude. The appearance of this modulation is related to van Hove singularities in the Landau subbands, which traverse the Fermi level with changing $B$. The singularities are connected with bending the Landau subbands due to strong electron correlations. The frequency of the modulation is of the same order of magnitude as the quantum oscillation frequency observed in underdoped cuprates. ; Comment: 14 pages, 4 figures Minimize

Year of Publication:

2013-08-01

Document Type:

text

Subjects:

Condensed Matter - Strongly Correlated Electrons

Condensed Matter - Strongly Correlated Electrons Minimize

DDC:

530 Physics *(computed)*

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Title:

Temperature behavior of the magnon modes of the square lattice antiferromagnet

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A spin-wave theory of short-range order in the square lattice Heisenberg antiferromagnet is formulated. With growing temperature from T=0 a gapless mode is shown to arise simultaneously with opening a gap in the conventional spin-wave mode. The spectral intensity is redistributed from the latter mode to the former. For low temperatures the theor...

A spin-wave theory of short-range order in the square lattice Heisenberg antiferromagnet is formulated. With growing temperature from T=0 a gapless mode is shown to arise simultaneously with opening a gap in the conventional spin-wave mode. The spectral intensity is redistributed from the latter mode to the former. For low temperatures the theory reproduces results of the modified spin-wave theory by M.Takahashi, J.E.Hirsch et al. and without fitting parameters gives values of observables in good agreement with Monte Carlo results in the temperature range 0 <= T < 0.8J where J is the exchange constant. ; Comment: 12 pages, 2 figures Minimize

Year of Publication:

1999-05-24

Document Type:

text

Subjects:

Condensed Matter - Strongly Correlated Electrons ; Condensed Matter - Statistical Mechanics

Condensed Matter - Strongly Correlated Electrons ; Condensed Matter - Statistical Mechanics Minimize

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Title:

Two-dimensional t-J model at moderate doping

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Using the method which retains the rotation symmetry of spin components in the paramagnetic state and has no preset magnetic ordering, spectral and magnetic properties of the two-dimensional t-J model in the normal state are investigated for the ranges of hole concentrations 0 <= x <= 0.16 and temperatures 0.01t <= T <= 0.2t. The used hopping t ...

Using the method which retains the rotation symmetry of spin components in the paramagnetic state and has no preset magnetic ordering, spectral and magnetic properties of the two-dimensional t-J model in the normal state are investigated for the ranges of hole concentrations 0 <= x <= 0.16 and temperatures 0.01t <= T <= 0.2t. The used hopping t and exchange J parameters of the model correspond to hole-doped cuprates. The obtained solutions are homogeneous which indicates that stripes and other types of phase separation are not connected with the strong electron correlations described by the model. A series of nearly equidistant maxima in the hole spectral function calculated for low T and x is connected with hole vibrations in the region of the perturbed short-range antiferromagnetic order. The hole spectrum has a pseudogap in the vicinity of (0,\pi) and (\pi,0). For x \approx 0.05 the shape of the hole Fermi surface is transformed from four small ellipses around (\pm\pi/2,\pm\pi/2) to two large rhombuses centered at (0,0) and (\pi,\pi). The calculated temperature and concentration dependencies of the spin correlation length and the magnetic susceptibility are close to those observed in cuprate perovskites. These results offer explanations for the observed scaling of the static uniform susceptibility and for the changes in the spin-lattice relaxation and spin-echo decay rates in terms of the temperature and doping variations in the spin excitation spectrum of the model. ; Comment: 12 pages, 14 figures Minimize

Year of Publication:

2003-02-18

Document Type:

text

Subjects:

Condensed Matter - Strongly Correlated Electrons ; Condensed Matter - Superconductivity

Condensed Matter - Strongly Correlated Electrons ; Condensed Matter - Superconductivity Minimize

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530 Physics *(computed)*

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Title:

Low-frequency incommensurate magnetic response in strongly correlated systems

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It is shown that in the t-J model of Cu-O planes at low frequencies the dynamic spin structure factor is peaked at incommensurate wave vectors (1/2+-delta,1/2)$, (1/2,1/2+-delta). The incommensurability is connected with the momentum dependencies of the magnon frequency and damping near the antiferromagnetic wave vector. The behavior of the inco...

It is shown that in the t-J model of Cu-O planes at low frequencies the dynamic spin structure factor is peaked at incommensurate wave vectors (1/2+-delta,1/2)$, (1/2,1/2+-delta). The incommensurability is connected with the momentum dependencies of the magnon frequency and damping near the antiferromagnetic wave vector. The behavior of the incommensurate peaks is similar to that observed in La_{2-x}(Ba,Sr)_xCuO_{4+y} and YBa_2Cu_3O_{7-y}: for hole concentrations 0.02<x<=0.12 we find that delta is nearly proportional to x, while for x>0.12 it tends to saturation. The incommensurability disappears with increasing temperature. Generally the incommensurate magnetic response is not accompanied by an inhomogeneity of the carrier density. ; Comment: 4 pages, 4 figures Minimize

Year of Publication:

2004-02-20

Document Type:

text

Subjects:

Condensed Matter - Strongly Correlated Electrons ; Condensed Matter - Superconductivity

Condensed Matter - Strongly Correlated Electrons ; Condensed Matter - Superconductivity Minimize

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Title:

Magnetic properties of the doped two-dimensional antiferromagnet

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The variety of the normal-state magnetic properties of cuprate high-Tc superconductors is interpreted based on the self-consistent solution of the self-energy equations for the two-dimensional t-J model. The observed variations of the spin correlation length with the hole concentration x, of the spin susceptibility with x and temperature T and t...

The variety of the normal-state magnetic properties of cuprate high-Tc superconductors is interpreted based on the self-consistent solution of the self-energy equations for the two-dimensional t-J model. The observed variations of the spin correlation length with the hole concentration x, of the spin susceptibility with x and temperature T and the scaling of the static uniform susceptibility are well reproduced by the calculated results. The nonmonotonic temperature dependence of the Cu spin-lattice relaxation rate is connected with two competing tendencies in the low-frequency susceptibility: its temperature decrease due to the increasing spin gap and the growth of the susceptibility in this frequency region with the temperature broadening of the maximum in the susceptibility. ; Comment: 6 pages, 5 figures, Proc. Int. Conf. "Modern Problems of Superconductivity", 9-14 Sept. 2002, Yalta, Ukraine Minimize

Year of Publication:

2002-09-04

Document Type:

text

Subjects:

Condensed Matter - Strongly Correlated Electrons ; Condensed Matter - Superconductivity

Condensed Matter - Strongly Correlated Electrons ; Condensed Matter - Superconductivity Minimize

DDC:

530 Physics *(computed)*

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Title:

One-loop approximation for the Heisenberg antiferromagnet

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We use the diagram technique for spin operators to calculate Green's functions and observables of the spin-1/2 quantum Heisenberg antiferromagnet on a square lattice. The first corrections to the self-energy and interaction are taken into account in the chain diagrams. The approximation reproduces main results of Takahashi's modified spin-wave t...

We use the diagram technique for spin operators to calculate Green's functions and observables of the spin-1/2 quantum Heisenberg antiferromagnet on a square lattice. The first corrections to the self-energy and interaction are taken into account in the chain diagrams. The approximation reproduces main results of Takahashi's modified spin-wave theory [Phys. Rev. B 40, 2494 (1989)] and is applicable in a wider temperature range. The energy per spin calculated in this approximation is in good agreement with the Monte Carlo and small-cluster exact-diagonalization calculations in the range 0 <= T < 1.2J where J is the exchange constant. For the static uniform susceptibility the agreement is good for T < 0.6J and becomes somewhat worse for higher temperatures. Nevertheless the approximation is able to reproduce the maximum in the temperature dependence of the susceptibility near T = 0.9J. ; Comment: 15 pages, 6 ps figures Minimize

Year of Publication:

2000-10-19

Document Type:

text

Subjects:

Condensed Matter - Strongly Correlated Electrons

Condensed Matter - Strongly Correlated Electrons Minimize

DDC:

541 Physical chemistry *(computed)*

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Title:

Mechanisms of the magnetic incommensurability in p-type cuprate perovskites

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We use the t-J model and Mori projection operator formalism for calculating the magnetic susceptibility of p-type cuprates in the superconducting and pseudogap phases. The lack of extended tails in the peaks of the hole spectral function was shown to provide an incommensurate low-frequency response with hole dispersions derived from photoemissio...

We use the t-J model and Mori projection operator formalism for calculating the magnetic susceptibility of p-type cuprates in the superconducting and pseudogap phases. The lack of extended tails in the peaks of the hole spectral function was shown to provide an incommensurate low-frequency response with hole dispersions derived from photoemission. The theory reproduces the hourglass dispersion of the susceptibility maxima with the upper branch reflecting the dispersion of localized spin excitations and the lower branch being due to incommensurate maxima of their damping. The intensive resonance peak appears when the hourglass waist falls below the bottom of the electron-hole continuum. In the pseudogap phase, the Fermi arcs lead to a quasi-elastic incommensurate response for low temperatures. This result explains the lack of the superconducting gap in the susceptibility of phase-separated underdoped lanthanum cuprates. It may also explain the strengthening of the quasi-elastic response by magnetic fields and impurities. The theory accounts for the magnetic stripe reorientation from the axial to diagonal direction at low hole concentrations. ; Comment: 9 pages, 5 figures, Proc. of ICSM2012, Istanbul Minimize

Year of Publication:

2012-08-20

Document Type:

text

Subjects:

Condensed Matter - Strongly Correlated Electrons

Condensed Matter - Strongly Correlated Electrons Minimize

DDC:

530 Physics *(computed)*

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Title:

Magnetic incommensurability and fluctuating charge density waves in the repulsive Hubbard model

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Magnetic and charge susceptibilities of the two-dimensional repulsive Hubbard model are investigated applying a strong coupling diagram technique in which the expansion in powers of the hopping constants is used. For small lattices and high temperatures results are in agreement with Monte Carlo simulations. With the departure from half-filling $...

Magnetic and charge susceptibilities of the two-dimensional repulsive Hubbard model are investigated applying a strong coupling diagram technique in which the expansion in powers of the hopping constants is used. For small lattices and high temperatures results are in agreement with Monte Carlo simulations. With the departure from half-filling $x$ the low-frequency magnetic susceptibility becomes incommensurate and the incommensurability parameter grows with $x$. The incommensurability, its dependence on frequency and on $x$ resemble experimental results in lanthanum cuprates. Also for finite $x$ sharp maxima appear in the static charge susceptibility. The maxima are finite which points to the absence of the long-range charge ordering (static stripes). However, for $x\approx 0.12$ the maxima are located near the momenta $(0,\pm\pi/2)$, $(\pm\pi/2,0)$. In this case an interaction of carriers with tetragonal distortions can stabilize stripes with the wavelength of four lattice spacings, as observed in the low-temperature tetragonal phase of cuprates. As follows from the obtained results, the magnetic incommensurability is not a consequence of the stripes. ; Comment: 4 pages, 3 figures, manuscript for proceefings of LT25 Minimize

Year of Publication:

2008-06-27

Document Type:

text

Subjects:

Condensed Matter - Strongly Correlated Electrons

Condensed Matter - Strongly Correlated Electrons Minimize

DDC:

530 Physics *(computed)*

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Title:

Fluctuating charge density waves in the Hubbard model

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The charge susceptibility of the two-dimensional repulsive Hubbard model is investigated using the diagram technique developed for the case of strong correlations. In this technique, a power series in the hopping constant is used. It is shown that once the Fermi level crosses one of the Hubbard subbands a sharp peak appears in the momentum depen...

The charge susceptibility of the two-dimensional repulsive Hubbard model is investigated using the diagram technique developed for the case of strong correlations. In this technique, a power series in the hopping constant is used. It is shown that once the Fermi level crosses one of the Hubbard subbands a sharp peak appears in the momentum dependence of the static susceptibility. With further departure from half-filling the peak transforms to a ridge around the $\Gamma$ point. In the considered range $0\leq|1-\bar{n}|\alt 0.2$ of the electron filling $\bar{n}$ the static susceptibility is finite which points to the absence of the long-range charge ordering. However, for $|1-\bar{n}|\approx 0.12$ the susceptibility maxima are located halfway between the center and the boundaries of the Brillouin zone. In this case an interaction of carriers with tetragonal distortions can stabilize the charge density wave with the wavelength of four lattice spacings, as observed experimentally in the low-temperature tetragonal phase of lanthanum cuprates. In the range of parameters inherent in cuprate perovskites the character of the susceptibility evolution with $\bar{n}$ depends only weakly on the ratio of the nearest-neighbor hopping constant to the Hubbard repulsion and on details of the initial band structure. The location of the susceptibility maxima in the Brillouin zone is mainly determined by the value of $\bar{n}$. ; Comment: 8 pages, 4 figures Minimize

Year of Publication:

2007-12-28

Document Type:

text

Subjects:

Condensed Matter - Strongly Correlated Electrons

Condensed Matter - Strongly Correlated Electrons Minimize

DDC:

530 Physics *(computed)*

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