Search results for: M. Farshad

Items from 1 to 20 out of 26 results

article

Pull-out strength of patient-specific template-guided vs. free-hand fluoroscopically controlled thoracolumbar pedicle screws: a biomechanical analysis of a randomized cadaveric study

A. Aichmair, M. Moser, M. R. Bauer, E. Bachmann, more

European Spine Journal > 2017 > 26 > 11 > 2865-2872

Purpose To assess the pull-out strength of thoracolumbar pedicle screws implanted via either a patient-specific template-guided or conventional free-hand fluoroscopically controlled technique in a randomized cadaveric study, and to evaluate the influence of local vertebral bone density, quantified by Hounsfield units (HU), on pedicle screw pull-out strength. Methods Thoracolumbar pedicles of three...

article

Cost-effectiveness of conservative versus surgical treatment strategies of lumbar spinal stenosis in the Swiss setting: analysis of the prospective multicenter Lumbar Stenosis Outcome Study (LSOS)

A. Aichmair, J. M. Burgstaller, M. Schwenkglenks, J. Steurer, more

European Spine Journal > 2017 > 26 > 2 > 501-509

Purpose To evaluate the cost-effectiveness of conservative versus surgical treatment strategies for lumbar spinal stenosis (LSS). Methods Patients prospectively enrolled in the multicenter Lumbar Stenosis Outcome Study (LSOS) with a minimum follow-up of 12 months were included. Quality adjusted life years (QALY) were calculated based on EQ-5D data. Cost data were retrieved retrospectively. Cost-effectiveness...

article

The Spinopelvic Geometry in Different Lenke Curve Types of Adolescent Idiopathic Scoliosis

M. Farshad, S. Catanzaro, S.L. Schmid

Spine Deformity > 2016 > 4 > 6 > 425-431

The Lenke classification is well established in differentiation of curve types in adolescent idiopathic scoliosis (AIS) and guides selection of fusion levels. However, to date, it has neglected the spinopelvic parameters that have been associated with compensatory mechanisms in balancing the human erect posture and adjacent segment problems after spinal fusion. The aim of this study was to investigate...

article

Surgery for lumbar disc herniation: Analysis of 500 consecutive patients treated in an interdisciplinary spine centre

S.L. Schmid, C. Wechsler, M. Farshad, A. Antoniadis, more

Journal of Clinical Neuroscience > 2016 > 27 > Complete > 40-43

Surgical removal of a symptomatic herniated lumbar disc is performed either with or without the support of a microscope. Up to the time of writing, the literature has reported similar clinical outcomes for the two procedures. Five hundred consecutive patients, operated upon for primary single-level lumbar disc herniation in our University Spine Center between 2003–2011, with (n=275), or without (n=225),...

article

Radiographic measurement error of the scoliotic curve angle depending on positioning of the patient and the side of scoliotic curve

Samuel L. Schmid, F. M. Buck, T. Böni, M. Farshad

European Spine Journal > 2016 > 25 > 2 > 379-384

Background The Cobb angle measurement is well established for the measurement of coronal deformity aspect of scoliotic curves. The effect of positional differences in relation to the apex side of the scoliosis is not yet fully quantified. While theoretically plausible that positioning error with rotation toward the apex of the scoliosis would decrease the Cobb angle, the relations are not investigated...

article

Semiautomatic superimposition improves radiological assessment of curve flexibility in scoliosis

Nadja A. Farshad-Amacker, T. D. Nguyen, M. Farshad, G. Andreisek, more

European Radiology > 2015 > 25 > 3 > 860-864

Objective Assessment of scoliotic curve flexibility and stiffness is essential for planning surgical treatment in adolescent idiopathic scoliosis (AIS). Measurement of curve flexibility is currently insufficiently precise. The purpose of this study was to introduce and validate a novel method of superimposing radiographs for more reliable measurement of curve flexibility. Material and methods...

article

Abduction extension cervical nerve root stress test: anatomical basis and clinical relevance

M. Farshad, K. Min

European Spine Journal > 2013 > 22 > 7 > 1522-1525

Purpose While the Lasègue straight leg raising test is an established test for lumbar nerve root compression, an established equivalent for cervical nerve root compression is missing. The aim of this bi-modal study was to find the most effective way to stretch the cervical nerve roots anatomically in cadavers and to assess its value in the clinical setting. Methods Three positional maneuvers of...

article

Intraoperative Imaging of the Distal Radioulnar Joint Using a Modified Skyline View

G. Klammer, M. Dietrich, M. Farshad, L. Iselin, more

Journal of Hand Surgery > 2012 > 37 > 3 > 503-508

Nonanatomic reduction of the sigmoid notch in distal radius fractures may lead to limited motion, instability, or pain with pronation and supination. Standard radiological projections only poorly capture the sigmoid notch contours in the axial plane. The purpose of this study was to find an intraoperatively feasible radiological projection that will facilitate an axial view of the distal radioulnar...

article

Negative muscle pennation angle as a sign of massive musculotendinous retraction after tendon tear: paradoxical function of the vastus lateralis muscle

D. C. Meyer, C. Gerber, M. Farshad

Knee Surgery, Sports Traumatology, Arthroscopy > 2011 > 19 > 9 > 1536-1539

Case report In the presented case, an isolated vastus lateralis tendon tear resulted in a negative pennation angle of the distal muscle fibers acting paradoxical to the physiological direction of the proximal muscle fibers. This observation makes the value of an in situ repair of a far retracted tendon tear with interposition of a graft questionable and emphasizes early over late anatomic surgical...

chapter

A new method of PWM pulses generation in induction motor drive using artificial neural networks

M A S Nejad, M Farshad, H M Rad

SPEEDAM 2010 > 942 - 946

2010 International Symposium on Power Electronics, Electrical Drives, Automation and Motion (SPEEDAM 2010)

Due to simplicity and low cost, induction motors are more useful than direct current motors. Hence the control of these motors is important. The pervious methods are fitted normally for a limited speed range and could not be used for both low speed and high speed. The voltage model is suitable for high speed because the voltage drop of stator resistance is not small in low speed voltage. The current...

article

Clinical outcome and long-term follow-up after liposuction procedures

C. Koehler, M. Farshad, M. Sen, T. Scholz, more

European Journal of Plastic Surgery > 2007 > 29 > 5 > 209-215

Liposuction is one of the most common aesthetic procedure used in plastic surgery. Reports are available on the results, the probable complications, and the feedback of patients. However, systematic studies dealing with these aspects using reliable large-enough data are still needed. The data comprised 116 procedures during a 6-year period up to 2005. The data were processed and categories of results...

article

Retrospective analysis and clinical evaluation of mandible reconstruction with a free fibula flap

V. Wedler, M. Farshad, M. Sen, C. Koehler, more

European Journal of Plastic Surgery > 2007 > 29 > 6 > 293-293

The online version of the original article can be found at: http://dx.doi.org/10.1007/s00238-006-0081-y .

article

Retrospective analysis and clinical evaluation of mandible reconstruction with free fibula flap

V. Wedler, M. Farshad, M. Sen, C. Koehler, more

European Journal of Plastic Surgery > 2007 > 29 > 6 > 285-291

The objective of this investigation was to evaluate the indications for and the functional and cosmetic results of mandible reconstruction using free vascularized fibular flaps. It was also designed to assess the patients’ quality of life, daily activities, and self-esteem, with special emphasis on patient satisfaction. We conducted a retrospective chart review of all patients who underwent osseus...

article

A COMPREHENSIVE RENAL INJURY CONCEPT BASED UPON IMPACT TESTS ON PORCINE KIDNEYS AND A VALIDATED (FRESH HUMAN CADAVER) FINITE ELEMENT MODEL OF THE HUMAN ABDOMEN

F. Schmidlin, J. Snedeker, P. Niederer, M. Farshad, more

European Urology Supplements > 2006 > 5 > 2 > 244

article

Determination of the long-term hydrostatic strength of multilayer pipes

M. Farshad

Polymer Testing > 2005 > 24 > 8 > 1041-1048

In this paper, a new methodology for prediction of the long-term (creep rupture) behavior of multilayer pipes under internal hydrostatic pressure is presented. For this purpose, a procedure using the three dimensional theory of thick-walled multilayer pipes together with a combined quadratic/linear regression analysis is used. The theory of thick walled tubes is used to assess the role of each layer...

article

Strain energy density as a rupture criterion for the kidney: impact tests on porcine organs, finite element simulation, and a baseline comparison between human and porcine tissues

J.G. Snedeker, M. Barbezat, P. Niederer, F.R. Schmidlin, more

Journal of Biomechanics > 2005 > 38 > 5 > 993-1001

High-velocity (up to 25m/s) impact tests were performed on pig kidneys to characterize failure behavior at deformation rates associated with traumatic injury. Cylindrical tissue samples (n=45) and whole perfused organs (n=34) were impacted using both falling weights and a high-velocity pneumatic projectile impactor. Impact energy was incrementally increased until visible rupture occurred. The strain...

article

Strain-rate dependent material properties of the porcine and human kidney capsule

J.G. Snedeker, P. Niederer, F.R. Schmidlin, M. Farshad, more

Journal of Biomechanics > 2005 > 38 > 5 > 1011-1021

This study was performed to characterize the mechanical properties of the kidney capsular membrane at strain-rates associated with blunt abdominal trauma. Uniaxial quasi-static and dynamic tensile experiments were performed on fresh, unfrozen porcine and human renal capsules at deformation rates ranging from 0.0001 to 7m/s (strain-rates of 0.005–250s ⁻¹ ). Single stroke, dynamic tests were...

article

Compression properties of magnetostrictive polymer composite gels

M. Farshad, M. Le Roux

Polymer Testing > 2005 > 24 > 2 > 163-168

In this research work, compression behavior of magnetostrictive silicone gels under the influence of an external magnetic field was investigated. Magnetostrictive gel specimens were made of silicon gel with 80% weight fraction of 3.8μm embedded carbonyl iron particles. Compression tests were performed on cylindrical samples of these materials in the absence and in the presence of a magnetic field...

article

Two new criteria for the service life prediction of plastics pipes

M. Farshad

Polymer Testing > 2004 > 23 > 8 > 967-972

In this contribution, two new criteria and related methodologies for the prediction of the long-term (creep rupture) behavior of single layer and multilayer plastics pipes under hydrostatic pressure are presented. One of these is the ultimate strain extrapolation method (USEM) and the other is called the distortion energy extrapolation method (DEEM). The strain concept is based on the use of the failure...

article

Strain corrosion of glass fibre-reinforced plastics pipes

M. Farshad, A. Necola

Polymer Testing > 2004 > 23 > 5 > 517-521

In this contribution, results of long-term strain corrosion tests on glass fiber reinforced unsaturated polyester (GRP) pipe ring samples are reported. The pipe sections tested had a nominal diameter of 500 mm, an external diameter of about 520 mm, and a wall thickness of about 11 mm. The pipes had been produced by a filament winding process. The nominal ring stiffness was 10 000 N/m ² ....

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Search results for: M. Farshad

Pull-out strength of patient-specific template-guided vs. free-hand fluoroscopically controlled thoracolumbar pedicle screws: a biomechanical analysis of a randomized cadaveric study

Cost-effectiveness of conservative versus surgical treatment strategies of lumbar spinal stenosis in the Swiss setting: analysis of the prospective multicenter Lumbar Stenosis Outcome Study (LSOS)

The Spinopelvic Geometry in Different Lenke Curve Types of Adolescent Idiopathic Scoliosis

Surgery for lumbar disc herniation: Analysis of 500 consecutive patients treated in an interdisciplinary spine centre

Radiographic measurement error of the scoliotic curve angle depending on positioning of the patient and the side of scoliotic curve

Semiautomatic superimposition improves radiological assessment of curve flexibility in scoliosis

Abduction extension cervical nerve root stress test: anatomical basis and clinical relevance

Intraoperative Imaging of the Distal Radioulnar Joint Using a Modified Skyline View

Negative muscle pennation angle as a sign of massive musculotendinous retraction after tendon tear: paradoxical function of the vastus lateralis muscle

A new method of PWM pulses generation in induction motor drive using artificial neural networks

Clinical outcome and long-term follow-up after liposuction procedures

Retrospective analysis and clinical evaluation of mandible reconstruction with a free fibula flap

Retrospective analysis and clinical evaluation of mandible reconstruction with free fibula flap

A COMPREHENSIVE RENAL INJURY CONCEPT BASED UPON IMPACT TESTS ON PORCINE KIDNEYS AND A VALIDATED (FRESH HUMAN CADAVER) FINITE ELEMENT MODEL OF THE HUMAN ABDOMEN

Determination of the long-term hydrostatic strength of multilayer pipes

Strain energy density as a rupture criterion for the kidney: impact tests on porcine organs, finite element simulation, and a baseline comparison between human and porcine tissues

Strain-rate dependent material properties of the porcine and human kidney capsule

Compression properties of magnetostrictive polymer composite gels

Two new criteria for the service life prediction of plastics pipes

Strain corrosion of glass fibre-reinforced plastics pipes

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