394 results on '"Andrea Ferretti"'
Search Results
352. Ten to twenty years follow-up of staple capsulorrhaphy for recurrent anterior dislocation of the shoulder
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M. Calderaro, Andrea Ferretti, and A. De Carli
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medicine.medical_specialty ,business.industry ,Dislocation (syntax) ,medicine ,Orthopedics and Sports Medicine ,Surgery ,General Medicine ,business - Published
- 1996
353. Recurrent anterior dislocation of the shoulder: Results of capsulorrhaphy using non absorbable suture anchors
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Andrea Ferretti, A. De Carli, and Fabio Conteduca
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medicine.medical_specialty ,business.industry ,Absorbable suture ,Medicine ,Orthopedics and Sports Medicine ,Surgery ,General Medicine ,Dislocation ,business - Published
- 1996
354. Learning curve in tissue sparing total hip replacement: comparison between different approaches.
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Carmelo D’Arrigo, Attilio Speranza, Edoardo Monaco, Alessandro Carcangiu, Andrea Ferretti, D'Arrigo, Carmelo, Speranza, Attilio, Monaco, Edoardo, Carcangiu, Alessandro, and Ferretti, Andrea
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TOTAL hip replacement ,COMPARATIVE studies ,SURGICAL complications ,ENDOSCOPIC surgery ,SURGEONS ,CONTROL groups - Abstract
Background: The tissue sparing surgery (TSS) concept means not only smaller incisions but also less tissue disruption, allowing decreased blood loss and improved function. However, TSS techniques can result in more complications related to the learning curve. The aim of this study was to compare the learning curve of an experienced surgeon with different TSS approaches for total hip replacement (THR) from a clinical and surgical point of view, focussing especially on complications related to the use of different geometric stems.Materials and Methods: Sixty patients scheduled to be operated for a primary THR were enrolled in the study and were randomly assigned to surgery by one of three different TSS approaches: lateral with mini incision (group A), minimally invasive anterior (group B) and minimally invasive antero-lateral (group C). Results from the three TSS groups were compared with a control group of 149 patients (group D).Results: Our results reveal significantly reduced blood loss in the TSS groups compared with the control group, with no differences between the TSS groups. We found better early functional scores in the two minimally invasive groups (anterior and anterolateral), and a lower rate of complications with the antero-lateral TSS approach.Conclusion: The antero-lateral TSS approach seems to be safer and less demanding than standard THR surgery, and is suitable for use with different stems. [ABSTRACT FROM AUTHOR]- Published
- 2009
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355. Operative treatment of chronic Achilles tendinopathy.
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Maria Chiara Vulpiani, Matteo Guzzini, and Andrea Ferretti
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ACHILLES tendon ,SURGERY ,PERITENDINITIS ,TENDON diseases - Abstract
Seventy-six patients with Achilles tendinopathies ( n=86) operated between 1980 and 1995 were retrospectively evaluated at an average follow-up of 13 (5?21) years. Total or gross partial ruptures were excluded. Patients' average age at surgery was 38 (18?58) years. The majority of patients were active in competitive or recreational sports. Tendinopathies were classified in peritendinitis, tendinosis, insertional tendinopathies, and mixed forms. The surgical technique depended entirely on the pathology encountered. For 32 cases of peritendinitis, results were excellent in 26, good in four, and poor in two. For eight cases of tendinosis, results were excellent in four and good in four. For 34 cases of insertional tendinopathy, results were excellent in 22, good in four, fair in four, and poor in four. For 12 cases of mixed tendinopathies, results were excellent in ten and good in two. Forty-nine patients (52 cases) were able to return to sport at the desired level. [ABSTRACT FROM AUTHOR]
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- 2003
356. Suprascapular neuropathy in volleyball players
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G Russo, Andrea Ferretti, and G Cerullo
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Adult ,Male ,medicine.medical_specialty ,Electromyography ,Asymptomatic ,Suprascapular neuropathy ,Peripheral Nerve Injuries ,Stress, Physiological ,medicine ,Paralysis ,Humans ,Orthopedics and Sports Medicine ,Dominant side ,Denervation ,medicine.diagnostic_test ,business.industry ,Muscles ,General Medicine ,Suprascapular nerve ,Biomechanical Phenomena ,Isokinetic dynamometer ,Athletic Injuries ,Physical therapy ,Female ,Surgery ,medicine.symptom ,business ,human activities ,Sports - Abstract
We examined ninety-six top-level volleyball players from eight teams that competed during the 1985 European Championships, and twelve players were found to have asymptomatic isolated paralysis of the infraspinatus of the dominant side. Three players were studied with electromyography and Cybex-II isokinetic dynamometry. The results revealed denervation of the infraspinatus and approximately a 22 per cent loss of strength of the affected arm during external rotation. These findings were attributed to repeated stress due to stretching of the nerve during cocking of the arm and follow-through when the athlete was serving.
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- 1987
357. Jumper's Knee: An Epidemiological Study of Volleyball Players
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Andrea Ferretti, Massimo Neri, G. Puddu, and Pier Paolo Mariani
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030222 orthopedics ,medicine.medical_specialty ,biology ,Athletes ,Jumper ,Physical Therapy, Sports Therapy and Rehabilitation ,030229 sport sciences ,Age and sex ,medicine.disease ,biology.organism_classification ,03 medical and health sciences ,0302 clinical medicine ,Tendinitis ,Epidemiology ,medicine ,Physical therapy ,Orthopedics and Sports Medicine ,Championship ,Psychology ,human activities ,Jumper's knee - Abstract
In brief: We studied 407 volleyball players to investigate the factors that cause patellar or quadriceps tendinitis (jumper's knee). Athletes from 30 teams in various divisions of the Italian Volleyball Federation championship were interviewed personally or by questionnaire. Factors investigated included age and sex, years of play, frequency of training sessions and games, type of playing surface, and type of training. The results showed that symptoms occurred most often among athletes playing five times a week or more and among those playing on hard surfaces, such as cement. Age, sex, years of play, and type of training were less significant factors.
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- 1984
358. Jumper's Knee
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Andrea Ferretti, P. P. Mariani, Ernesto Ippolito, and G. Puddu
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Adult ,Male ,musculoskeletal diseases ,medicine.medical_specialty ,Patellar tendinitis ,Physical Therapy, Sports Therapy and Rehabilitation ,Tendonitis ,Tendons ,03 medical and health sciences ,0302 clinical medicine ,Metaplasia ,Soccer ,medicine ,Humans ,Orthopedics and Sports Medicine ,Dancing ,Hyaline ,030222 orthopedics ,Ossification ,business.industry ,Jumper ,Patella ,030229 sport sciences ,musculoskeletal system ,medicine.disease ,Surgery ,medicine.anatomical_structure ,Athletic Injuries ,Tendinopathy ,Fibrocartilage ,Female ,Quadriceps tendon ,medicine.symptom ,business ,human activities ,Follow-Up Studies - Abstract
Jumper's knee (patellar or quadriceps tendon tendon itis) is found in a high number of athletes, especially in volleyball and basketball players. Conservative treatment (rest, stretching, physical therapy and an tiinflammatory drugs) is usually successful. The ath letes often recover completely and resume their sports activity. The purpose of this study is to present the histologic findings and our surgical repair of 18 knees of patients who underwent surgery after failure of conservative treatment. Histologic findings confirm that the so-called "jumper's knee" is a pathology localized at the bone- tendon junction. In all cases the following abnormali ties were found:pseudocystic cavities at the borderline between mineralized fibrocartilage and bone, disap pearance of the "blue line," increased thickness of the insertional fibrocartilage with myxomatous and hyaline metaplasia, mineralization, and ossification of the fibrocartilage far from the "blue line." Abnormali ties of the patellar tendon were observed only in one patient who received local injection of corticosteroids. Eleven of the 18 surgically treated knees obtained a satisfactory result with complete resumption of sports activity.
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- 1983
359. Single harvesting in the all-inside graft-link technique: is the graft length crucial for success? A biomechanical study
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Dario Perugia, Edoardo Monaco, Andrea Ferretti, Luca Labianca, Matteo Guzzini, Mattia Fabbri, and Riccardo Maria Lanzetti
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medicine.medical_specialty ,Anterior cruciate ligament reconstruction ,acl ,medicine.medical_treatment ,medicine.disease_cause ,biomechanics ,Weight-bearing ,Tendons ,Tissue Culture Techniques ,Weight-Bearing ,03 medical and health sciences ,0302 clinical medicine ,Suture (anatomy) ,Tensile Strength ,Materials Testing ,medicine ,Ultimate failure ,Animals ,Femur ,Orthopedics and Sports Medicine ,Tibia ,Orthodontics ,030222 orthopedics ,Anterior Cruciate Ligament Reconstruction ,business.industry ,Biomechanics ,all-inside ,030229 sport sciences ,musculoskeletal system ,Surgery ,Tendon ,medicine.anatomical_structure ,graft ,surgery ,orthopedics and sports medicine ,Original Article ,Cattle ,business - Abstract
Background The all-inside graft-link technique for anterior cruciate ligament reconstruction is performed with two cortical suspension devices with adjustable loops on both femur and tibia. This technique requires meticulous graft preparation. The aim of this study was to biomechanically test three different graft configurations resulting from differences in initial graft length. Materials and methods Thirty bovine digital extensor tendons were arranged in three different ways: “half-quadrupled”, “tripled” and “quadrupled”. The final graft length was 65–75 mm. The specimens were fixed vertical to the loading axis of a tensile testing machine. After a static pre-conditioning of 50 N for 5 min, a load to failure test was performed and data regarding the ultimate failure load (UFL), the stiffness and mode of failure were recorded. Results The evaluation of UFL showed a significant differences between group means as determined by one-way analysis of variance (F = 21.92, p = 0.002). Post hoc comparisons showed a significantly better UFL of “tripled” (p = 0.007) and “quadrupled” preparations (p = 0.014) compared to the “half-quadrupled” configuration, with no significant differences between “tripled” and “quadrupled” grafts (p = 0.061). No significant differences were found when evaluating the stiffness between the groups. Failure occurred by tendon slippage across the suture in all specimens. Conclusion The “quadrupled” tendon achieved the best UFL, with even the “tripled” configuration having sufficient biomechanical characteristics to withstand the loads experienced during early rehabilitation. For this reason, with a total semitendinosus length of less than 260 mm it could be better to “triple” instead of “half-quadruple” it to achieve better performance of the graft.
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360. Epidemiology of jumper's knee
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Andrea Ferretti
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musculoskeletal diseases ,Male ,medicine.medical_specialty ,Patellar tendinitis ,Time Factors ,Sports medicine ,Knee Joint ,Physical Therapy, Sports Therapy and Rehabilitation ,Knee Injuries ,Epidemiology ,medicine ,Humans ,Orthopedics and Sports Medicine ,Physical Education and Training ,business.industry ,Somatotypes ,Age Factors ,Jumper ,musculoskeletal system ,medicine.disease ,medicine.anatomical_structure ,Athletic Injuries ,Tendinopathy ,Physical therapy ,Female ,Quadriceps tendon ,Stress, Mechanical ,business ,human activities ,Jumper's knee - Abstract
Jumper's knee is a typical functional overload injury because it affects those athletes who submit their knee extensor mechanisms to intense and repeated stress, e.g. volleyball and basketball players, high and long jumpers. According to the classification of Perugia and colleagues, it is an insertional tendinopathy affecting, in order of frequency, the insertion of the patellar tendon into the patella (65% of cases), attachment of the quadriceps tendon to the patella (25%) and the attachment of the patellar tendon to the tibial tuberosity (10%). The frequent occurrence of this injury in athletes led to the study of factors that may contribute to its onset and aggravation. These factors are divided into extrinsic (i.e. kind of sport practised and training methods used) and intrinsic (i.e. connected with the somatic and morphological characteristics of the athletes). On the basis of our experience and after a review of the literature it appears, contrary to what has been repeatedly claimed in the past, the extrinsic factors are more important than the intrinsic in the aetiology of jumper's knee. The effect of traumatic incidents and use of elastic kneecap guards should also be considered negligible. The intrinsic causes of jumper's knee, can be sought in the mechanical properties of tendons (resistance, elasticity and extensibility) rather than in morphological or biomechanical abnormalities of the knee extensor mechanism.
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- 1986
361. Meniscal tears and associated anterior cruciate ligament tears in athletes: course of treatment
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Andrea Ferretti, P. P. Mariani, Francesco La Spesa, and G. Puddu
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Adult ,Joint Instability ,Male ,medicine.medical_specialty ,Adolescent ,Knee Joint ,Anterior cruciate ligament ,Meniscal tears ,Physical Therapy, Sports Therapy and Rehabilitation ,medicine ,Humans ,Orthopedics and Sports Medicine ,Rating system ,Prospective Studies ,Sports activity ,Anterior cruciate ligament tears ,biology ,Athletes ,business.industry ,musculoskeletal system ,biology.organism_classification ,Prognosis ,Surgery ,medicine.anatomical_structure ,Athletic Injuries ,Ligaments, Articular ,Ligament ,Female ,business ,human activities ,Meniscal lesions ,Follow-Up Studies - Abstract
Sixty-two athletes whose injured knees had negligible instability were found to have an absent or functionless anterior cruciate ligament (ACL) at the time of medial meniscectomy. After a mean of 52 months of followup, 51 patients were examined; 24 (47%) had returned to full sports activities, whereas 27 (53%) acknowledged incidents of the knee "giving way" or having completely given up sports because of instability. By analyzing the following variables, the jerk test, the type of meniscal lesion, and the type of sports engaged, we formulated a rating system to be used intraopera tively for determining the need for combining meniscec tomy with a ligament reconstruction.
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- 1984
362. Long-term assessment of negative arthroscopies
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P. P. Mariani, Andrea Ferretti, C. Gigli, and G. Puddu
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Adult ,Male ,medicine.medical_specialty ,medicine.diagnostic_test ,Adolescent ,business.industry ,Arthroscopy ,Menisci, Tibial ,Lower limb ,Endoscopy ,Surgery ,Tibial Meniscus Injuries ,Clinical diagnosis ,medicine ,Humans ,Orthopedics and Sports Medicine ,Female ,business ,Diagnostic arthroscopy ,False Negative Reactions ,Meniscal lesions ,Follow-Up Studies - Abstract
A study of 75 patients was performed to assess the accuracy of arthroscopy carried out for clinical diagnosis of meniscal tear. In these patients, arthroscopy did not detect any intraarticular pathology that could explain the preoperative symptoms. Of the 75 patients, seven were subsequently reoperated on, but in 68 the typical symptoms of meniscal tear improved after the diagnostic arthroscopy.
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- 1987
363. Isokinetic evaluation of the knee after arthroscopic meniscectomy: Comparison between anterolateral and central approaches
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Andrea Ferretti, C. Gigli, P. P. Mariani, and G. Puddu
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Arthroscopic meniscectomy ,Adult ,Male ,medicine.medical_specialty ,medicine.diagnostic_test ,Knee Joint ,business.industry ,Chirurgie orthopedique ,Muscles ,Arthroscopy ,Meniscal tears ,Flexor muscles ,Menisci, Tibial ,Endoscopy ,Surgery ,Tibial Meniscus Injuries ,Kinetics ,Isokinetic dynamometer ,Orthopedic surgery ,medicine ,Humans ,Orthopedics and Sports Medicine ,business - Abstract
Twenty patients had undergone arthroscopic meniscectomy for medial bucket-handle meniscal tears. Half had undergone meniscectomy with central approach, and half had been treated by anterolateral technique. Isokinetic evaluation, with a Cybex II isokinetic dynamometer, was done preoperatively and at 14 and 28 days postoperatively. Two weeks after operation, there was only a slight and insignificant decrease of quadriceps function with the central approach as compared with the anterolateral. However, at 4 weeks, no differences were shown between the two portals. The flexor muscles generally recovered more rapidly with the central technique.
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- 1987
364. The natural history of Jumper's Knee. Patellar or quadriceps tendonitis
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P. P. Mariani, Andrea Ferretti, M. Neri, and G. Puddu
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Male ,medicine.medical_specialty ,Knee Joint ,Tendonitis ,Knee Injuries ,Lesion ,medicine ,Humans ,Orthopedics and Sports Medicine ,biology ,business.industry ,Athletes ,Jumper ,Patella ,biology.organism_classification ,Surgery ,Natural history ,Orthopedic surgery ,Athletic Injuries ,Tendinopathy ,Female ,medicine.symptom ,business ,human activities - Abstract
We have reviewed the clinical records and the results of conservative and surgical treatment of 125 out of 172 cases of Jumper's Knee followed for at least 2 years since the onset of symptoms. All were athletes involved in various sporting activities. At follow up 15 patients had given up sport and the lesion had healed spontaneously. We used the classification of Blazina et al as modified by Roels et al. Twenty-four patients were in stage 1, 42 in stage 2, 43 in stage 3 and one in stage 4. Conservative treatment was used primarily on all patients with one exception where the tendon had ruptured. The results were very good in 42, good in 32, and poor in 43, but in 36 patients a long period of rest and reduction in sporting activity was necessary before a significant improvement was obtained. Operation was carried out on 16 patients (19 knees), 18 were in stage 3 and one in stage 4. Various surgical techniques were used. The results were very good in 7 knees, good in 5 and poor in 7. Operation is indicated after the failure of conservative measures and in patients who do not want to reduce their sporting level. The aim should be to induce healing at the bone tendon junction. We emphasize the importance of the prevention of jumper's knee in athletes.
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- 1985
365. Bridging density-functional and many-body perturbation theory: Orbital-density dependence in electronic-structure functionals
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Andrea Ferretti, Ismaila Dabo, Matteo Cococcioni, and Nicola Marzari
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Physics ,Classical mechanics ,Density dependence ,Atomic orbital ,Quasiparticle ,Charge density ,Electronic structure ,Invariant (physics) ,Classification of discontinuities ,Condensed Matter Physics ,Unitary state ,Electronic, Optical and Magnetic Materials - Abstract
Energy functionals which depend explicitly on orbital densities, rather than on the total charge density, appear when applying self-interaction corrections to density-functional theory; this is, e.g., the case for Perdew-Zunger and Koopmans-compliant functionals. In these formulations the total energy is not invariant under unitary rotations of the orbitals, and local, orbital-dependent potentials emerge. We argue that this is not a shortcoming, and that instead these potentials can provide, in a functional form, a simplified quasiparticle approximation to the spectral potential, i.e., the local, frequency-dependent contraction of the many-body self-energy that is sufficient to describe exactly the spectral function. As such, orbital-density-dependent functionals have the flexibility to accurately describe both total energies and quasiparticle excitations in the electronic-structure problem. In addition, and at variance with the Kohn-Sham case, orbital-dependent potentials do not require nonanalytic derivative discontinuities. We present numerical solutions based on the frequency-dependent Sham-Schlüter equation to support this view, and examine some of the existing functionals in this perspective, highlighting the very close agreement between exact and approximate orbital-dependent potentials. © 2014 American Physical Society.
366. Maximally localized Wannier functions constructed from projector-augmented waves or ultrasoft pseudopotentials
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R. Di Felice, Andrea Ferretti, Benedetta Bonferroni, and Arrigo Calzolari
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Physics ,Wannier function ,Wave propagation ,INITIO MOLECULAR-DYNAMICS ,ELECTRONIC POLARIZATION ,Plane wave ,Electronic structure ,Condensed Matter Physics ,law.invention ,Pseudopotential ,Formalism (philosophy of mathematics) ,Dipole ,Condensed Matter::Materials Science ,MACROSCOPIC POLARIZATION ,Projector ,DIMETHYL-PHOSPHATE ,law ,Quantum mechanics ,General Materials Science ,SPONTANEOUS POLARIZATION - Abstract
We report a theoretical scheme that enables the calculation of maximally localized Wannier functions within the formalism of projector-augmented waves (PAW), which also includes the ultrasoft pseudopotential (USPP) approach. We give a description of the basic underlying formalism and explicitly write out all the required matrix elements using the common ingredients of the PAW/USPP theory. We report an implementation of the method in a form suitable for accepting the input electronic structure from USPP plane-wave DFT simulations. We apply the method to the calculation of Wannier functions, dipole moments and spontaneous polarizations for a range of test cases. A comparison with norm-conserving pseudopotentials is reported as a benchmark.
367. Navigated knee kinematics after tear of the ACL and its secondary restraints: preliminary results
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Edoardo Monaco, Barbara Maestri, Andrea Ferretti, Luca Labianca, Carmelo D'Arrigo, Attilio Speranza, and Matthew James Kelly
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musculoskeletal diseases ,Joint Instability ,Male ,medicine.medical_specialty ,Knee Joint ,Anterior cruciate ligament ,Knee kinematics ,Kinematics ,Knee Injuries ,Rotation ,Lacerations ,Weight-Bearing ,Computer-Assisted ,medicine ,80 and over ,Cadaver ,Humans ,Orthopedics and Sports Medicine ,Anterior Cruciate Ligament ,Aged ,Aged, 80 and over ,Orthodontics ,Rupture ,business.industry ,Anterior Cruciate Ligament Injuries ,Middle Aged ,musculoskeletal system ,medicine.disease ,ACL injury ,Biomechanical Phenomena ,medicine.anatomical_structure ,Surgery, Computer-Assisted ,Bundle ,Orthopedic surgery ,Ligament ,Female ,Surgery ,business ,human activities - Abstract
In this study we evaluated the role of the anterior cruciate ligament (ACL) and its secondary restraint in controlling knee stability using a navigation system. The purpose of this study was to evaluate the kinematics of the knee in different conditions of instability: ACL intact, after transection of the posterolateral (PL) bundle, after transection of the anteromedial (AM) bundle, and after lesion of the anterolateral femorotibial ligament (ALFTL). Anterior tibial translation and rotation were measured with a computer navigation system in 6 knees in whole fresh-frozen human cadavers by use of a manual maximum load. Anterior translation was evaluated at 30°, 60°, and 90° of flexion; rotation at 0°, 15°, 30°, 45°, 60°, and 90° of flexion. Cutting the PL bundle does not increase anterior translation and rotation of the knee. Cutting the AM bundle significantly increased the anteroposterior (AP) translation at 30° and 60° of flexion ( P =.01), but does not increase rotation of the knee. Cutting the ALFTL increased anterior translation at 60° of flexion ( P =.04) and rotation at 30°, 45°, and 60° of flexion ( P =.03). The PL bundle does not affect anterior translation and rotation of the knee. The AM bundle is the primary restraint of the anterior translation but does not affect rotation of the knee. The lateral compartment becomes the primary restraint of rotation after ACL cut. The primary kinematic effect of an ACL injury is an increase in anterior tibial translation, but there is no significant change in maximum internal or external rotation. The lesion of the ALFTL increases tibial rotation and could be correlated to the pivot shift phenomenon.
368. Towards high-throughput many-body perturbation theory: efficient algorithms and automated workflows
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Miki Bonacci, Junfeng Qiao, Nicola Spallanzani, Antimo Marrazzo, Giovanni Pizzi, Elisa Molinari, Daniele Varsano, Andrea Ferretti, and Deborah Prezzi
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optical-properties ,Condensed Matter - Materials Science ,greens-function ,Mechanics of Materials ,Modeling and Simulation ,Materials Science (cond-mat.mtrl-sci) ,FOS: Physical sciences ,band-gaps ,General Materials Science ,semiconductors ,Computer Science Applications - Abstract
The automation of ab initio simulations is essential in view of performing high-throughput (HT) computational screenings oriented to the discovery of novel materials with desired physical properties. In this work, we propose algorithms and implementations that are relevant to extend this approach beyond density functional theory (DFT), in order to automate many-body perturbation theory (MBPT) calculations. Notably, a novel algorithm pursuing the goal of an efficient and robust convergence procedure for GW and BSE simulations is provided, together with its implementation in a fully automated framework. This is accompanied by an automatic GW band interpolation scheme based on maximally-localized Wannier functions, aiming at a reduction of the computational burden of quasiparticle band structures while preserving high accuracy. The proposed developments are validated on a set of representative semiconductor and metallic systems., Comment: 14 pages, 6 figures
369. Intrinsic edge excitons in two-dimensional MoS2
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Deborah Prezzi, Andrea Ferretti, Elisa Molinari, Nicola Marzari, Marco Gibertini, Daniele Varsano, and Pino D'Amico
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Exciton ,Binding energy ,FOS: Physical sciences ,02 engineering and technology ,magnetic-properties ,Edge (geometry) ,01 natural sciences ,Mesoscale and Nanoscale Physics (cond-mat.mes-hall) ,0103 physical sciences ,Perturbation theory ,010306 general physics ,defects ,nanoribbons ,Physics ,Condensed Matter - Materials Science ,Condensed Matter - Mesoscale and Nanoscale Physics ,Condensed matter physics ,Materials Science (cond-mat.mtrl-sci) ,transition ,Function (mathematics) ,021001 nanoscience & nanotechnology ,mobility ,Orientation (vector space) ,Character (mathematics) ,Zigzag ,heterostructures ,lifetimes ,photoluminescence ,0210 nano-technology ,interlayer excitons ,single-layer mos2 - Abstract
Using accurate first-principles calculations based on many-body perturbation theory we predict that two-dimensional MoS$_2$ hosts edge excitons with universal character, intrinsic to the existence of edges and lying well below the onset of bulk features. These excitons are largely insensitive to edge terminations or orientation, persisting even in the presence of metallic screening at zigzag edges, with large binding energies of $\sim$0.4 eV. Additional excitons can also emerge in ultranarrow ribbons, or as a function of the chemical nature of the termination. The chemical, structural, and electronic similarities with Se- or W-based transition-metal dichalcogenides suggest that these optical features could be common in this class of materials., Comment: 7 pages main text, 5 pages supplemental material, 12 figures
370. Oxygen-mediated electron transport through hybrid silicon-organic interfaces
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Elisa Molinari, Benedetta Bonferroni, Arrigo Calzolari, Andrea Ferretti, Alice Ruini, and Marilia J. Caldas
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Materials science ,Silicon ,chemistry.chemical_element ,Bioengineering ,Nanotechnology ,Electronic structure ,Monolayer ,Molecule ,General Materials Science ,Electrical and Electronic Engineering ,SURFACES ,Mechanical Engineering ,Chemistry (all) ,MONOLAYERS ,Molecular electronics ,MICROSCOPY ,JUNCTIONS ,General Chemistry ,Electron transport chain ,chemistry ,Chemical bond ,Mechanics of Materials ,Density functional theory ,Materials Science (all) ,NEGATIVE DIFFERENTIAL RESISTANCE - Abstract
We investigate from first principles the electronic and transport properties of hybrid organic/silicon interfaces of relevance to molecular electronics. We focus on conjugated molecules bonded to hydrogenated Si through hydroxyl or thiol groups. The electronic structure of the systems is addressed within density functional theory, and the electron transport across the interface is directly evaluated within the Landauer approach. The microscopic effects of molecule-substrate bonding on the transport efficiency are explicitly analyzed, and the oxygen-bonded interface is identified as a candidate system when preferential hole transfer is needed.
371. Charge transport and radiative recombination in polythiophene crystals: a first-principles study
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Giovanni Bussi, Elisa Molinari, Andrea Ferretti, Alice Ruini, and M. J. Caldas
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Conductive polymer ,Coupling ,Stereochemistry ,Chemistry ,Mechanical Engineering ,trasporto elettronico ,Metals and Alloys ,Charge (physics) ,Luminescence quantum yield ,Condensed Matter Physics ,DFT ,Settore FIS/03 - Fisica della Materia ,Electronic, Optical and Magnetic Materials ,chemistry.chemical_compound ,struttura elettronica ,proprieta' ottiche ,polimeri coniugati ,Mechanics of Materials ,Chemical physics ,Materials Chemistry ,Polythiophene ,Spontaneous emission ,Density functional theory ,Electronic band structure - Abstract
We investigate two phases of polythiophene crystals by means of first-principles calculations, focusing on the effect of the different structure on charge transport parameters and luminescence quantum yield. The resulting microscopic interpretation highlights the impact of solid-state interchain coupling on both transport and emissive properties of semiconducting polymer crystals.
372. Unified Green's function approach for spectral and thermodynamic properties from algorithmic inversion of dynamical potentials
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Tommaso Chiarotti, Nicola Marzari, and Andrea Ferretti
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Condensed Matter - Materials Science ,limit ,gw self-energy ,maximum-entropy method ,General Physics and Astronomy ,Materials Science (cond-mat.mtrl-sci) ,FOS: Physical sciences ,degenerate electron-gas ,space-time method ,Condensed Matter - Other Condensed Matter ,analytic continuation ,single-particle spectrum ,Other Condensed Matter (cond-mat.other) - Abstract
Dynamical potentials appear in many advanced electronic-structure methods, including self-energies from many-body perturbation theory, dynamical mean-field theory, electronic-transport formulations, and many embedding approaches. Here, we propose a novel treatment for the frequency dependence, introducing an algorithmic inversion method that can be applied to dynamical potentials expanded as sum over poles. This approach allows for an exact solution of Dyson-like equations at all frequencies via a mapping to a matrix diagonalization, and provides simultaneously frequency-dependent (spectral) and frequency-integrated (thermodynamic) properties of the Dyson-inverted propagators. The transformation to a sum over poles is performed introducing $n$-th order generalized Lorentzians as an improved basis set to represent the spectral function of a propagator, and using analytic expressions to recover the sum-over-poles form. Numerical results for the homogeneous electron gas at the $G_0W_0$ level are provided to argue for the accuracy and efficiency of such unified approach., Comment: Main: 16 pages, 11 figures. Supplemental Material: 4 pages, 10 figures
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373. Evaluation of the results of extensor mechanism reconstruction
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P. P. Mariani, G. Puddu, Andrea Ferretti, G. Cerullo, and Fabio Conteduca
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Adult ,Joint Instability ,Male ,medicine.medical_specialty ,Adolescent ,Knee Joint ,Joint Dislocations ,Physical Therapy, Sports Therapy and Rehabilitation ,03 medical and health sciences ,0302 clinical medicine ,medicine ,Humans ,Orthopedics and Sports Medicine ,Retrospective Studies ,030222 orthopedics ,business.industry ,Muscles ,Extensor mechanism ,030229 sport sciences ,Patella ,humanities ,Surgery ,Evaluation Studies as Topic ,Female ,business ,Follow-Up Studies - Abstract
One hundred sixteen patients underwent extensor mechanism reconstruction. Ninety-four returned at fol lowup (3 to 11 years after surgery). Twenty-two pa tients were lost to followup. Subjectively, 74% of the patients had either an excellent or good result and 26% either a fair or poor result. We found retrospectively, that the patients with either fair or poor results had a stable or only mildly unstable patella preoperatively.
374. Patellar tendinosis: A follow-up study of surgical treatment
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Emanuela Camerucci, Fabio Conteduca, Federico Morelli, and Andrea Ferretti
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Adult ,Male ,musculoskeletal diseases ,medicine.medical_specialty ,Adolescent ,Tendinosis ,Tendons ,Muscular Diseases ,Tendinitis ,medicine ,Humans ,Orthopedics and Sports Medicine ,Surgical treatment ,Retrospective Studies ,biology ,Athletes ,business.industry ,Retrospective cohort study ,Patella ,General Medicine ,musculoskeletal system ,biology.organism_classification ,medicine.disease ,Surgery ,Tendon ,medicine.anatomical_structure ,Orthopedic surgery ,Physical therapy ,Female ,business ,human activities ,Follow-Up Studies - Abstract
Background: Patellar tendinopathy (jumper's knee) is an overuse syndrome that frequently affects athletes. A retrospective study was done to analyze the results at a minimum of five years after the performance of a surgical technique in competitive athletes. Methods: From 1985 to 1995, thirty-two patients (thirty-eight knees) affected by patellar tendinopathy were treated surgically after failure of nonoperative treatment. All knees were operated on by the same surgeon using the same surgical technique: longitudinal splitting of the tendon, excision of any abnormal tissue that was identified, and resection and drilling of the inferior pole of the patella. The results in twenty-seven patients (thirty-three knees), including twenty-two athletes (twenty-seven knees) who were still involved in sports activities (or wished to still be involved) at a competitive level at the time of final follow-up, were reviewed at a mean of eight years postoperatively. The results were evaluated according to symptoms and the ability to return to full sports activities. Results: The result was excellent in twenty-three knees (70%), good in five, fair in one, and poor in four at the time of the long-term follow-up. Eighty-two percent of the patients who tried to pursue sports at their preinjury level were able to do so, and 63% of those knees were totally symptom-free. Conclusions: The outcome of the described surgical treatment appears to be satisfactory; however, the results are less predictable in volleyball players.
375. Symmetry lowering of pentacene molecular states interacting with a Cu surface
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Ivana Vobornik, Arrigo Calzolari, Alice Ruini, Jun Fujii, Elisa Molinari, Giorgio Rossi, Rosa Di Felice, Carlo Mariani, Maria Grazia Betti, Chiara Baldacchini, Andrea Ferretti, and E. Annese
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Materials science ,molecular electronics ,Photoemission spectroscopy ,Inverse photoemission spectroscopy ,Pentacene ,STM ,Angle-resolved photoemission spectroscopy ,Molecular physics ,MONOLAYER ,chemistry.chemical_compound ,Condensed Matter::Materials Science ,Molecular orbital ,Physics::Chemical Physics ,CU(119) SURFACE ,Condensed matter physics ,interface electronic states ,Charge density ,ARPES ,Condensed Matter Physics ,ORDERED PENTACENE ,Electronic, Optical and Magnetic Materials ,ELECTRONIC-STRUCTURE ,chemistry ,Density of states ,GROWTH ,Density functional theory - Abstract
Pentacene adsorbed on the Cu(119) vicinal surface forms long-range ordered chain structures. Photoemission spectroscopy measurements and ab initio density functional theory simulations provide consistent evidences that pentacene molecular orbitals mix with the copper bands, giving rise to interaction states localized at the interface. Angular-resolved and polarization dependent photoemission spectroscopy shows that most of the pentacene derived intensity is strongly dichroic. The symmetry of the molecular states of the free pentacene molecules is reduced upon adsorption on Cu(119), as a consequence of the molecule-metal interaction. Theoretical results show a redistribution of the charge density in $\ensuremath{\pi}$ molecular states close to the Fermi level, consistent with the photoemission intensities (density of states) and polarization dependence (orbital symmetry).
376. First-principles theory of correlated transport through nanojunctions (vol 4, art no 116802, 2005)
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Andrea Ferretti, Calzolari, A., Di Felice, R., Manghi, F., Caldas, Mj, Nardelli, Mb, and Molinari, E.
377. Interlocking horizontal mattress suture versus Kakiuchi technique in repair of Achilles tendon rupture: a biomechanical study
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Lorenzo Proietti, Edoardo Monaco, Daniele Mazza, Germano Ferri, Riccardo Maria Lanzetti, Andrea Ferretti, Mattia Fabbri, and Matteo Guzzini
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medicine.medical_specialty ,Mattress suture ,Achilles tendon repair ,Achilles Tendon ,03 medical and health sciences ,0302 clinical medicine ,Tendon Injuries ,Kakiuchi ,medicine ,Ultimate failure ,Animals ,Orthopedics and Sports Medicine ,Interlocking ,Fibrous joint ,030222 orthopedics ,Achilles tendon ,Sutures ,business.industry ,Interlocking horizontal mattress ,Suture Techniques ,030229 sport sciences ,Biomechanical study ,Surgery ,Biomechanical Phenomena ,Disease Models, Animal ,medicine.anatomical_structure ,Orthopedic surgery ,Original Article ,Achilles tendon rupture ,medicine.symptom ,business - Abstract
Background In recent years, the type of surgical treatment for Achilles tendon rupture has been the subject of controversial debate. This biomechanical study evaluates for the first time in literature the ultimate failure load (UFL) of interlocking horizontal mattress (IHM) suture as compared with Kakiuchi suture in Achilles tendon rupture. The hypothesis is that IHM suture can be performed also for Achilles tendon rupture and ensures higher resistance compared with the traditional Kakiuchi suture. Materials and methods Twenty fresh bovine Achilles tendons were obtained. Ten preparations were randomly assigned to each of two different groups: group A (10 specimens) sutured by IHM technique, and group B (10 specimens) sutured by Kakiuchi technique. Each construct was mounted and fixed on a tensile testing machine. Static preconditioning of 50 N was applied for 5 min as initial tensioning to stabilize the mechanical properties of the graft, then a load to failure test was performed at crosshead speed of 500 mm/min. Results Ten specimens were tested for each group. The mean UFL was 228.6 ± 98.6 N in the IHM suture group and 96.57 ± 80.1 N in the Kakiuchi suture group. Statistical analysis showed a significant difference (p
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378. Electron delocalization at the hybrid aromatic-thiol/Cu(100) interface
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Andrea Ferretti and Di Felice, R.
379. Defect-induced effects on carrier migration through one-dimensional poly(para-phenylenevinylene) chains
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Laura Zoppi, Andrea Ferretti, M. J. Caldas, Arrigo Calzolari, and Alice Ruini
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chemistry.chemical_classification ,Photoluminescence ,Materials science ,Hydrogen ,Photoconductivity ,POLY(P-PHENYLENEVINYLENE) ,chemistry.chemical_element ,SUBSTITUTION ,Polymer ,DEGRADATION ,Condensed Matter Physics ,Oxygen ,Electron transport chain ,TRANSPORT ,OXYGEN ,Electronic, Optical and Magnetic Materials ,Condensed Matter::Materials Science ,CONJUGATED POLYMERS ,PPV FILMS ,chemistry ,Chemical physics ,Ab initio quantum chemistry methods ,Density functional theory - Abstract
Defects in one-dimensional (1D) systems can be intrinsically distinct from its three-dimensional counterparts, and polymer films are good candidates for showing both extremes that are difficult to individuate in the experimental data. We study theoretically the impact of simple hydrogen and oxygen defects on the electron transport properties of one-dimensional poly(para-phenylenevinylene) chains through a multiscale technique, starting from classical structural simulations for crystalline films to extensive ab initio calculations within density functional theory for the defects in single crystalline-constrained chains. The most disruptive effect on carrier transport comes from conjugation breaking imposed by the overcoordination of a carbon atom in the vinyl group independently from the chemical nature of the defect. The particular case of the $[\text{C}=\text{O}]$ (keto-defect) shows in addition unexpected electron-hole separation, suggesting that the experimentally detected photoluminescence bleaching and photoconductivity enhancement could be due to exciton dissociation caused by the 1D characteristics of the defect.
380. LAD Augmentation of Semitendinosus and Gracilis in ACL Reconstruction. Surgical Technique and Preliminary Results F. Conteduca, MD, A. Ferretti, MD, P. P. Mariani, MD— Rome, Italy
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Andrea Ferretti, Fabio Conteduca, and P. P. Mariani
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medicine.medical_specialty ,business.industry ,medicine ,Physical Therapy, Sports Therapy and Rehabilitation ,Orthopedics and Sports Medicine ,business ,Surgery - Published
- 1989
381. Narrowing of d bands of FeCo layers intercalated under graphene
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Dario A. Leon, Giulia Avvisati, Claudia Cardoso, Ivana Vobornik, Daniela Pacilé, Pietro Bonfà, Maria Grazia Betti, Carlo Mariani, Daniele Varsano, and Andrea Ferretti
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Materials science ,Physics and Astronomy (miscellaneous) ,Photoemission spectroscopy ,Intercalation (chemistry) ,FOS: Physical sciences ,02 engineering and technology ,Epitaxy ,01 natural sciences ,law.invention ,ferromagnets ,law ,0103 physical sciences ,angle-resolved photoemission spectroscopy ,Spin (physics) ,Electronic band structure ,density functional theory ,010302 applied physics ,Condensed Matter - Materials Science ,Condensed matter physics ,Graphene ,graphene ,Materials Science (cond-mat.mtrl-sci) ,021001 nanoscience & nanotechnology ,ferromagnetism ,ferromagnets, graphene, density of states, ferromagnetism, angle-resolved photoemission spectroscopy, density functional theory ,density of states ,Density of states ,Density functional theory ,0210 nano-technology - Abstract
We report on the electronic properties of an artificial system obtained by the intercalation of equiatomic FeCo layers under graphene grown on Ir(111). Upon intercalation, the FeCo film grows epitaxially on Ir(111), resulting in a lattice-mismatched system. By performing Density Functional Theory calculations, we show that the intercalated FeCo layer leads to a pronounced corrugation of the graphene film. At the same time, the FeCo intercalated layers induce a clear transition from a nearly undisturbed to a strongly hybridized graphene {\pi}-band, as measured by angle-resolved photoemission spectroscopy. A comparison of experimental results with the computed band structure and the projected density of states unveils a spin-selective hybridization between the {\pi} band of graphene and FeCo-3d states. Our results demonstrate that the reduced dimensionality, as well as the hybridization within the FeCo layers, induce a narrowing and a clear splitting of Fe 3d-up and Fe 3d-down spin bands of the confined FeCo layers with respect to bulk Fe and Co., Comment: 5 pages, 4 figures
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382. Q uantum ESPRESSO toward the exascale
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Andrea Ferretti, Paolo Giannozzi, Nicola Marzari, Stefano Baroni, Davide Brunato, Ivan Carnimeo, Oscar Baseggio, Fabrizio Ferrari Ruffino, Pietro Bonfà, Andrea Urru, Carlo Cavazzoni, Stefano de Gironcoli, Iurii Timrov, Roberto Car, and Pietro Delugas
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pseudopotentials ,turbotddft ,lattice-dynamics ,010304 chemical physics ,Computer science ,FOS: Physical sciences ,General Physics and Astronomy ,Computational Physics (physics.comp-ph) ,010402 general chemistry ,01 natural sciences ,Exascale computing ,Settore FIS/03 - Fisica della Materia ,0104 chemical sciences ,Computer Science::Hardware Architecture ,phonon dispersions ,Quantum ESPRESSO ,Computer architecture ,0103 physical sciences ,program ,Physical and Theoretical Chemistry ,Physics - Computational Physics ,Massively parallel ,database - Abstract
Quantum ESPRESSO is an open-source distribution of computer codes for quantum-mechanical materials modeling, based on density-functional theory, pseudopotentials, and plane waves, and renowned for its performance on a wide range of hardware architectures, from laptops to massively parallel computers, as well as for the breadth of its applications. In this paper, we present a motivation and brief review of the ongoing effort to port Quantum ESPRESSO onto heterogeneous architectures based on hardware accelerators, which will overcome the energy constraints that are currently hindering the way toward exascale computing.
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383. Oxygen-mediated electron transport through hybrid silicon-organic interfaces.
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Benedetta Bonferroni, Andrea Ferretti, Arrigo Calzolari, Alice Ruini, Marilia J Caldas, and Elisa Molinari
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- *
ELECTRONIC systems , *NONMETALS , *PARTICLES (Nuclear physics) , *FREE electron theory of metals - Abstract
We investigate from first principles the electronic and transport properties of hybrid organic/silicon interfaces of relevance to molecular electronics. We focus on conjugated molecules bonded to hydrogenated Si through hydroxyl or thiol groups. The electronic structure of the systems is addressed within density functional theory, and the electron transport across the interface is directly evaluated within the Landauer approach. The microscopic effects of molecule-substrate bonding on the transport efficiency are explicitly analyzed, and the oxygen-bonded interface is identified as a candidate system when preferential hole transfer is needed. [ABSTRACT FROM AUTHOR]
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- 2008
384. Ab initio correlation effects on the electronic and transport properties of metal(II)-phthalocyanine-based devices.
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Arrigo Calzolari, Andrea Ferretti, and Marco Buongiorno
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DENSITY functionals , *ELECTRON transport , *PHTHALOCYANINES , *METAL ions - Abstract
Using first-principles calculations in the framework of density functional theory, we investigated the electronic and transport properties of metal(II)-phthalocyanine (M(II)Pc) systems, both in a single-molecule configuration and in a model device geometry. In particular, using copper(II)-Pc and manganese(II)-Pc as prototypical examples, we studied how electronic correlations on the central metal ion influence the analysis of the electronic structure of the system and we demonstrated that the choice of the exchange-correlation functional, also beyond the standard local or gradient corrected level, is of crucial importance for a correct interpretation of the data. Finally, our electronic transport simulations have shown that M(II)Pc-based devices can act selectively as molecular conductors, as in the case of copper, or as spin valves, as in the case of manganese, demonstrating once more the great potential of these systems for molecular nanoelectronics applications. [ABSTRACT FROM AUTHOR]
- Published
- 2007
385. Fixation of patella fractures with metallic implants is associated with a significantly higher risk of complications and re-operations than non-metallic implants: a systematic review and meta-analysis.
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Edoardo, Monaco, Andrea, Del Duca, Silvia, Cardarelli, Fabio, Marzilli, Alessandro, Carrozzo, Adnan, Saithna, and Andrea, Ferretti
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FRACTURE fixation , *RANGE of motion of joints , *TREATMENT of fractures , *TREATMENT effectiveness , *REOPERATION , *FERRANS & Powers Quality of Life Index , *PATELLA , *META-analysis , *PATELLA fractures , *KNEE injuries - Abstract
Purpose: The use of metallic implants for the treatment of patella fractures often involves complications related to the hardware. As a result, there has been a considerable focus on the use of non-metallic implants. The aim of this study was to determine the differences in clinical outcomes, including the rates of complications and re-operations following the surgical management of patellar fractures with metallic versus non-metallic implants.Methods: The systematic review was conducted in accordance with PRISMA guidelines. Two investigators independently applied the search strategy to PubMed, SCOPUS, Google Scholar, and Cochrane databases, limited to publications between 1st January 2000 to 30st September 2021. The search strategy identified studies in which there was a comparison between the clinical outcome of the metallic and non-metallic fixation. Meta-analysis was conducted according to the Cochrane Collaboration and Quality of Reporting of Meta-Analysis (QUORUM) guidelines.Results: A total of 19 studies were selected for the systematic review and seven studies for the meta-analysis. Two hundred ninety-sixt patients formed the pooled study population for the meta-analysis. The outcomes evaluated in the meta-analysis were range of motion (ROM), complications, and re-operation rates. There was no significant difference between groups regarding ROM, but the risk ratio (RR) of re-operation (RR 0.19, 95% CI [0.09-0.41]) and complications (RR 0.30, 95% CI [0.17-0.55]) was significantly in favor of fixation with non-metallic implants.Conclusion: The use of non-metallic implants for fixation of patella fractures was associated with significantly lower risk of complications and re-operations than fixation with metallic implants, without any difference between groups with respect to the final range of motion or functional outcome measures. [ABSTRACT FROM AUTHOR]- Published
- 2022
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386. Mining Data for Financial Applications - 5th ECML PKDD Workshop, MIDAS 2020, Ghent, Belgium, September 18, 2020, Revised Selected Papers
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Valerio Bitetta, Ilaria Bordino, Andrea Ferretti, Francesco Gullo, Giovanni Ponti, and Lorenzo Severini
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- 2021
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387. Machine Learning and Principles and Practice of Knowledge Discovery in Databases - International Workshops of ECML PKDD 2021, Virtual Event, September 13-17, 2021, Proceedings, Part I
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Michael Kamp, Irena Koprinska, Adrien Bibal, Tassadit Bouadi, Benoît Frénay, Luis Galárraga, José Oramas, Linara Adilova, Yamuna Krishnamurthy, Bo Kang, Christine Largeron, Jefrey Lijffijt, Tiphaine Viard, Pascal Welke, Massimiliano Ruocco, Erlend Aune, Claudio Gallicchio, Gregor Schiele, Franz Pernkopf, Michaela Blott, Holger Fröning, Günther Schindler, Riccardo Guidotti, Anna Monreale, Salvatore Rinzivillo, Przemyslaw Biecek, Eirini Ntoutsi, Mykola Pechenizkiy, Bodo Rosenhahn, Christopher L. Buckley, Daniela Cialfi, Pablo Lanillos, Maxwell Ramstead, Tim Verbelen, Pedro M. Ferreira 0001, Giuseppina Andresini, Donato Malerba, Ibéria Medeiros, Philippe Fournier-Viger, M. Saqib Nawaz, Sebastián Ventura, Meng Sun 0002, Min Zhou 0006, Valerio Bitetta, Ilaria Bordino, Andrea Ferretti, Francesco Gullo, Giovanni Ponti, Lorenzo Severini, Rita P. Ribeiro, João Gama 0001, Ricard Gavaldà, Lee A. D. Cooper, Naghmeh Ghazaleh, Jonas Richiardi, Damian Roqueiro, Diego Saldana Miranda, Konstantinos Sechidis, and Guilherme Graça
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- 2021
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388. Mining Data for Financial Applications - 4th ECML PKDD Workshop, MIDAS 2019, Würzburg, Germany, September 16, 2019, Revised Selected Papers
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Valerio Bitetta, Ilaria Bordino, Andrea Ferretti, Francesco Gullo, Stefano Pascolutti, and Giovanni Ponti
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- 2020
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389. ECML PKDD 2018 Workshops - MIDAS 2018 and PAP 2018, Dublin, Ireland, September 10-14, 2018, Proceedings
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Carlos Alzate, Anna Monreale, Livio Bioglio, Valerio Bitetta, Ilaria Bordino, Guido Caldarelli, Andrea Ferretti, Riccardo Guidotti, Francesco Gullo, Stefano Pascolutti, Ruggero G. Pensa, Céline Robardet, and Tiziano Squartini
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- 2019
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390. Donor-Acceptor Shape Matching Drives Performance in Photovoltaics
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T. Schiros [1], G. Kladnik [2, D. Prezzi [4], A. Ferretti [4], G. Olivieri [3, A. Cossaro [3], L. Floreano [3], A. Verdini [3], C. Schenck [6], M. Cox [7], A. A. Gorodetsky [6], K. Plunkett [6], D. Delongchamp [8], C. Nuckolls [6], A. Morgante [3, D. Cvetko [2, I. Kymissis [7], Theanne, Schiro, Kladnik, Gregor, Deborah, Prezzi, Andrea, Ferretti, Giorgia, Olivieri, Cossaro, Albano, Luca, Floreano, Alberto, Verdini, Christine, Schenck, Marshall, Cox, Gorodetsky, Alon A., Kyle, Plunkett, Dean, Delongchamp, Colin, Nuckoll, Morgante, Alberto, Dean, Cvetko, and Ioannis, Kymissis
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Organic electronics ,Materials science ,Organic solar cell ,Renewable Energy, Sustainability and the Environment ,business.industry ,fullerene ,supramolecular material ,fullerenes ,Heterojunction ,organic electronics ,supramolecular materials ,solar cells ,Self-assembly ,Acceptor ,Supramolecular assembly ,solar cell ,Electron transfer ,Photovoltaics ,organic electronic ,Optoelectronics ,General Materials Science ,Density functional theory ,business - Abstract
While the demonstrated power conversion eff i ciency of organic photovoltaics (OPVs) now exceeds 10%, new design rules are required to tailor interfaces at the molecular level for optimal exciton dissociation and charge transport in higher effi ciency devices. We show that molecular shape-complementarity between donors and acceptors can drive performance in OPV devices. Using core hole clock (CHC) X-ray spectroscopy and density functional theory (DFT), we compare the electronic coupling, assembly, and charge transfer rates at the interface between C 60 acceptors and fl at- or contorted-hexabenzocorone (HBC) donors. The HBC donors have similar optoelectronic properties but differ in molecular contortion and shape matching to the fullerene acceptors. We show that shape-complementarity drives self-assembly of an intermixed morphology with a donor/acceptor (D/A) ball-and-socket interface, which enables faster electron transfer from HBC to C 60 . The supramolecular assembly and faster electron transfer rates in the shape complementary heterojunction lead to a larger active volume and enhanced exciton dissociation rate. This work provides fundamental mechanistic insights on the improved effi ciency of organic photovoltaic devices that incorporate these concave/convex D/A materials.
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- 2013
391. Chest pain caused by multiple exostoses of the ribs: A case report and a review of literature.
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Mazza D, Fabbri M, Calderaro C, Iorio C, Labianca L, Poggi C, Turturro F, Montanaro A, and Ferretti A
- Abstract
The aim of this paper is to report an exceptional case of multiple internal exostoses of the ribs in a young patient affected by multiple hereditary exostoses (MHE) coming to our observation for chest pain as the only symptom of an intra-thoracic localization. A 16 years old patient with familiar history of MHE came to our observation complaining a left-sided chest pain. This pain had increased in the last months with no correlation to a traumatic event. The computed tomography (CT) scan revealed the presence of three exostoses located on the left third, fourth and sixth ribs, all protruding into the thoracic cavity, directly in contact with visceral pleura. Moreover, the apex of the one located on the sixth rib revealed to be only 12 mm away from pericardium. Patient underwent video-assisted thoracoscopy with an additional 4-cm mini toracotomy approach. At the last 1-year follow-up, patient was very satisfied and no signs of recurrence or major complication had occured. In conclusion, chest pain could be the only symptom of an intra-thoracic exostoses localization, possibly leading to serious complications. Thoracic localization in MHE must be suspected when patients complain chest pain. A chest CT scan is indicated to confirm exostoses and to clarify relationship with surrounding structures. Video-assisted thoracoscopic surgery can be considered a valuable option for exostoses removal, alone or in addiction to a mini-thoracotomy approach, in order to reduce thoracotomy morbidity., Competing Interests: Conflict-of-interest statement: All the authors have no conflicts of interests to declare.
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- 2017
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392. Is it really necessary to restore radial anatomic parameters after distal radius fractures?
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Dario P, Matteo G, Carolina C, Marco G, Cristina D, Daniele F, and Andrea F
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- Adult, Disability Evaluation, Female, Hand Strength, Humans, Male, Middle Aged, Patient Satisfaction, Practice Guidelines as Topic, Radiography, Radius Fractures diagnostic imaging, Radius Fractures physiopathology, Radius Fractures rehabilitation, Range of Motion, Articular, Retrospective Studies, Wrist Joint diagnostic imaging, Wrist Joint physiopathology, Fracture Fixation, Internal methods, Palmar Plate, Radius Fractures surgery, Wrist Joint surgery
- Abstract
Unlabelled: Small variations within normal range of radiographic parameters, except ulnar variance and volar tilt, do not influence the final functional outcome in distal radius fractures., Introduction: There are many reports in the literature on the relationship between radiographic variables and their influence on the final outcome of distal radius fractures. Most authors report that a good functional result depends on anatomical restoration of the articular surface and extra-articular alignment. The aim of this study was to verify if it is really necessary to restore anatomic radiographic parameters to obtain satisfactory functional outcome in distal radius fractures treated with volar plate., Materials and Methods: We retrospectively evaluated 51 patients treated with volar locked plate for articular unstable distal radius fractures from December 2006 to March 2009. Each fracture was evaluated according to the AO classification. The average follow-up was 40.5 months. Radiological measurements were performed considering radial height, radial inclination, volar tilt and ulnar variance, both preoperatively and postoperatively, to estimate the correction value. We examined range of motion (ROM), grip strength with a Jamar(®) dynamometer and Disabilities of the Arm, Shoulder and Hand (DASH) score. The τ Student test was performed for statistical analysis., Results: The persistence of articular step-off was assessed in 35.3% of patients. Normal radial inclination (21-25°) was restored in 74.5% of patients (range 15-27.5°). Normal radial height (10-13 mm) was restored in 66.6% of patients (range 6.8-17.3mm). Normal volar tilt (7-15°) was achieved in 90.2% of patients (range 3-17°). Normal ulnar variance (0.7-1.5mm) was restored in 86.3% of patients (range 0.7-4.1mm). There was a statistically significant difference between the preoperative and postoperative radiographic values (p<0.01). The majority of patients showed complete recovery of ROM, with no statistically significant difference (p>0.05) in extension, flexion, supination and pronation compared with the contralateral hand. Eight patients who had postoperative volar tilt and/or ulnar variance out of range had a statistically significant difference (p<0.05) in ROM compared with the non-operated side. At final follow-up, all patients had a statistically significant difference (p<0.05) in grip strength compared with the contralateral side, even with good strength values. The mean DASH score was 12.2 (range 0-61)., Discussion and Conclusion: Our experience suggests that ulnar variance and volar tilt are the most important radiographic parameters to be restored to obtain good functional outcome in distal radius fracture. Small variations of other radiographic parameters seem to not affect the final outcome at minimum 3 years' follow-up., (Copyright © 2014 Elsevier Ltd. All rights reserved.)
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- 2014
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393. Smartphone versus knee ligament arthrometer when size does not matter.
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Ferretti A, Valeo L, Mazza D, Muliere L, Iorio P, Giovannetti G, Conteduca F, and Iorio R
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- Anterior Cruciate Ligament Reconstruction, Humans, Joint Instability surgery, Knee Injuries surgery, Knee Joint surgery, Physical Examination, Tibia, Anterior Cruciate Ligament Injuries, Arthrometry, Articular instrumentation, Cell Phone, Joint Instability diagnosis, Knee Injuries diagnosis, Mobile Applications
- Abstract
Purpose: The use of available mechanical methods to measure anterior tibial translation (ATT) in anterior cruciate ligament (ACL)-deficient knees are limited by size and costs. This study evaluated the performance of a portable device based on a downloadable electronic smartphone application to measure ATT in ACL-deficient knees., Methods: A specific smartphone application (SmartJoint) was developed for this purpose. Two independent observers nonsequentially measured the amount of ATT during execution of a maximum manual Lachman test in 35 patients with an ACL-deficient knee using KT 1000 and SmartJoint on both involved and uninvolved knees. As each examiner performed the test three times on each knee, a total of 840 measurements were collected. Statistical analysis compared intertest, interobserver and intra-observer reliability using the interclass correlation coefficient (ICC). An ICC > 0.75 indicates excellent reproducibility among measurements., Results: Mean amount of ATT on uninvolved knees was 6.1 mm [standard deviation (SD = 2)] with the KT 1000 and 6.4 mm (SD = 2) with SmartJoint. Mean side-to-side difference was 8.1 mm. (SD = 4) with KT 1000 and 8.3 mm (SD = 3) with SmartJoint. Intertest reliability between the two methods yielded an ICC 0.797 [95 % confidence interval (CI) 0.717-0.857] for the uninvolved knee and of 0.987 (CI 0.981-0.991) for the involved knee. Interobserver ICC for SmartJoint and KT 1000 was 0.957 (CI 0.927-0.976) for the uninvolved knee and 0.992 (CI 0.986-0.996) for the involved knee and 0.973 (CI 0.954-0.985) for the uninvolved knee and 0.989 (CI 0.981-0.994) for involved knee, respectively., Conclusion: The performance of SmartJoint is comparable and highly correlated with measurements obtained from KT 1000. SmartJoint may provide a truly portable, noninvasive, accurate, reliable, inexpensive and widely accessible method to characterize ATT in ACL-deficient knee.
- Published
- 2014
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394. Knee stability after anterior cruciate ligament reconstruction in patients older than forty years: comparison between different age groups.
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Conteduca F, Caperna L, Ferretti A, Iorio R, Civitenga C, and Ponzo A
- Subjects
- Adult, Age Factors, Arthrometry, Articular, Biomechanical Phenomena physiology, Female, Follow-Up Studies, Humans, Joint Instability physiopathology, Knee Joint physiology, Male, Range of Motion, Articular physiology, Retrospective Studies, Treatment Outcome, Anterior Cruciate Ligament surgery, Anterior Cruciate Ligament Reconstruction methods, Joint Instability surgery, Knee Joint surgery
- Abstract
Purpose: The aim of this study was to compare clinical and arthrometrical results of a series of patients older than 40 years with those of younger patients following anterior cruciate ligament (ACL) reconstruction. The hypothesis of this study was that certain biological and biomechanical factors related to middle-aged patients, ACL reconstruction would provide different results compared with younger patients., Methods: Thirty-six patients >40 years operated for ACL reconstruction between 2002 and 2010 were selected for this retrospective study, and results were compared with patients in two other age groups (<30 years and 30-40 years). At a minimum follow-up of two years, patients were reviewed and clinically examined subjectively and objectively according to Tegner, International Knee Documentation Committee (IKDC) classification and Lysholm evaluation scales. An arthrometric evaluation with KT-1000 was also performed., Results: No statistically significant difference was found among the three different age groups at the subjective and objective evaluations. However, the KT-1000 arthrometric study showed a statistically significant mean side-to-side difference at 30 lb with 1.8 mm [standard deviation (SD) 2.4] for patients >40 years, 2.7 mm (SD 1.8) for patients aged 30-40 years and 2.6 mm (SD 1.8) for patients <30 years., Conclusions: Our results seem to show that ACL reconstruction is a safe and valid option for patients of all age groups, even for those >40 years. Moreover, in that group, greater knee stability was found when compared with the younger patient groups.
- Published
- 2013
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