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Search Results: 1 - 10 of 220961 matches for " Konstantinos C. Xarchas "
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Tendon Allograft for Repair of the Medial Collateral Ligament of the Knee: A Case Report  [PDF]
Konstantinos C. Xarchas, Panagiotis Givissis
Open Journal of Orthopedics (OJO) , 2016, DOI: 10.4236/ojo.2016.610041
Abstract: In the rare cases with serious damage of the Medial Collateral Ligament (MCL) of the knee requiring surgical treatment, ligament remnants may be inadequate for a good repair. In such cases, reconstruction should be performed and technical options may be limited. We used an Achilles tendon allograft and applied it using the Pulvertaft weave technique for tendon repair. We found no previous reports of allograft application for MCL repair though the technique has been extensively used for Anterior Cruciate Ligament reconstruction.
Combined Use of Percutaneous Canulated Screws and External or Internal Fixation for Less Invasive Treatment of Tibial Plateaux Fractures  [PDF]
Konstantinos C. Xarchas, Georgios Kyriakopoulos, Dimitrios Mavrolias, Leon Oikonomou, Ioannis Petropoulos
Open Journal of Orthopedics (OJO) , 2015, DOI: 10.4236/ojo.2015.54011
Abstract: The classic way of treatment of tibial plateau fractures with an extensive approach, opening of the knee and compressive internal fixation can lead to major complications such as infection, skin necrosis and knee stiffness. Here we present a less invasive and thus safer surgical technique, and its indications and results. Twenty patients with various types of fractures according to Schatzker’s classification (mainly V and VI) were treated during a time period of seven years. Surgical treatment usually consisted of a combination of percutaneous canulated screws with a hybrid external fixator. In three cases canulated screws were combined with a laterally applied anatomic locking plate. Patients were followed up for six months to three years postoperatively. Indications as well as intra and postoperative parameters such as surgical time, stability of fixation, blood loss, wound healing, infection, fracture healing and final result were studied. No major complications were recorded either early or later. The use of external οr less invasive internal fixation in combination with percutaneous canulated screws appears to be an adequate method for the treatment of most types of these fractures.
Simultaneous dislocation of the radial head and distal radio-ulnar joint. A case report
D-A.J. Verettas, G.I. Drosos, K.C. Xarchas, C.N. Chatzipapas, C. Staikos
International Journal of Medical Sciences , 2008,
Abstract: Isolated dislocation of the distal radio-ulnar joint and isolated dislocation of the radial head in adults are not common injuries. A simultaneous dislocation of the radial head and distal radio-ulnar joint with no other injury seems to be extremely rare since only one report was found in the English literature. A similar case, but with some differences in presentation and treatment is reported.
Are Two Screws Enough for Fixation of Femoral Neck Fractures? A Case Series and Review of the Literature
K.C. Xarchas, C.D. Staikos, S. Pelekas, T. Vogiatzaki, K.J. KazakosD.A. Verettas
The Open Orthopaedics Journal , 2007, DOI: 10.2174/1874325000701010004]
Abstract: There is still a controversy in literature regarding the treatment of subcapital fractures of the hip with internal fixation. Different methods have been tested and studies such as in cadavers mainly prejudge the three cannulated screws application. We present a series of 20 patients in which percutaneous fixation with two parallel cannulated screws under specific technical conditions has led to an uneventful fracture union. No complications were observed at a one year follow- up. Reviewing the literature we found no previous clinical studies on the subject.
Ulnar Nerve Dislocation at the Elbow: Review of the Literature and Report of Three Cases
K.C. Xarchas, I. Psillakis, O. Koukou, K.J. Kazakos, A. VerveridisD.A. Verettas
The Open Orthopaedics Journal , 2007, DOI: 10.2174/1874325000701010001]
Abstract: Ulnar nerve instability without compression at the cubital tunnel is not common and even more rare is a dislocating nerve. We review the literature regarding the etiology of instability, its incidence and treatment. Snapping around the medial humeral epicondyle can also be caused by a subluxing medial head of the triceps. This pathology may be accompanied by symptoms from the ulnar nerve. Differential diagnosis even intraoperatively is therefore essential if effective treatment is to be given. We also present our own experience on the subject consisting of three cases, one of them with bilateral instability. In only one case there were clinical findings suggesting nerve compression. All laboratory and screening tests were normal, except for the nerve conduction studies in this one case. The main symptom was strong pain, especially during manual activities. Only two of the four subluxing nerves required surgical treatment which in our case was by anterior submuscular or subcutaneous transposition of the ulnar nerve. As diagnosis is not always easy and is usually made on clinical grounds, we also present a clinical test that we believe to be diagnostic for the situation.
Generalised integrable $λ$- and $η$-deformations and their relation
Konstantinos Sfetsos,Konstantinos Siampos,Daniel C. Thompson
Physics , 2015, DOI: 10.1016/j.nuclphysb.2015.08.015
Abstract: We construct two-parameter families of integrable $\lambda$-deformations of two-dimensional field theories. These interpolate between a CFT (a WZW/gauged WZW model) and the non-Abelian T-dual of a principal chiral model on a group/symmetric coset space. In examples based on the $SU(2)$ WZW model and the $SU(2)/U(1)$ exact coset CFT, we show that these deformations are related to bi-Yang-Baxter generalisations of $\eta$-deformations via Poisson-Lie T-duality and analytic continuation. We illustrate the quantum behaviour of our models under RG flow. As a byproduct we demonstrate that the bi-Yang-Baxter $\sigma$-model for a general group is one-loop renormalisable.
E-Rehabilitation – an Internet and mobile phone based tailored intervention to enhance self-management of Cardiovascular Disease: study protocol for a randomized controlled trial
Konstantinos Antypas, Silje C Wangberg
BMC Cardiovascular Disorders , 2012, DOI: 10.1186/1471-2261-12-50
Abstract: A parallel group, cluster randomized controlled trial. The study population is adult participants of a cardiac rehabilitation programme in Norway with home Internet access and mobile phone, who in monthly clusters are randomized to the control or the intervention condition. Participants have access to a website with information regarding cardiac rehabilitation, an online discussion forum and an online activity calendar. Those randomized to the intervention condition, receive in addition tailored content based on models of health behaviour, through the website and mobile text messages. The objective is to assess the effect of the intervention on maintenance of self-management behaviours after the rehabilitation stay. Main outcome is the level of physical activity one month, three months and one year after the end of the cardiac rehabilitation programme. The randomization of clusters is based on a true random number online service, and participants, investigators and outcome assessor are blinded to the condition of the clusters.The study suggests a theory-based intervention that combines models of health behaviour in an innovative way, in order to tailor the delivered content. The users have been actively involved in its design, and because of the use of Open-Source software, the intervention can easily and at low-cost be reproduced and expanded by others. Challenges are the recruitment in the elderly population and the possible underrepresentation of women in the study sample. Funding by Northern Norway Regional Health Authority.Trial registry http://www.clinicaltrials.gov webcite: NCT01223170.
Fish market prices drive overfishing of the ‘big ones’
Athanassios C. Tsikliras,Konstantinos Polymeros
PeerJ , 2015, DOI: 10.7717/peerj.638
Abstract: The relationship between fish market price and body size has not been explored much in fisheries science. Here, the mean market prices and fish body size were collected in order to examine the hypothesis that large fish, both among- and within-species, are being selectively targeted by fisheries because they may yield greater profit. Trophic levels, vulnerability to fishing and global landings were also collected because these variables may also be related to the market fish price. These relationships were examined using generalized additive models (GAM), which showed that, among species, fish market price was positively dependent on maximum total length (P = 0.0024) and negatively on landings (P = 0.0006), whereas it was independent of trophic level (P > 0.05) and vulnerability to fishing (P > 0.05). When the fish price vs. size relationship was tested within-species, large individuals were consistently attaining higher market prices compared to their medium and small-sized counterparts. We conclude that the selective removal of the larger fish, which is driven by their market price and to a lesser extent by their availability, may contribute to their overfishing.
Spacetimes for λ-deformations
Konstantinos Sfetsos,Daniel C. Thompson
Physics , 2014, DOI: 10.1007/JHEP12(2014)164
Abstract: We examine a recently proposed class of integrable deformations to two-dimensional conformal field theories. These {\lambda}-deformations interpolate between a WZW model and the non-Abelian T-dual of a Principal Chiral Model on a group G or, between a G/H gauged WZW model and the non-Abelian T-dual of the geometric coset G/H. {\lambda}-deformations have been conjectured to represent quantum group q-deformations for the case where the deformation parameter is a root of unity. In this work we show how such deformations can be given an embedding as full string backgrounds whose target spaces satisfy the equations of type-II supergravity. One illustrative example is a deformation of the Sl(2,R)/U(1) black-hole CFT. A further example interpolates between the $\frac{SU(2)\times SU(2)}{SU(2)}\times\frac{SL(2,R)\times SL(2,R)}{SL(2,R)} \times U(1)^4$ gauged WZW model and the non-Abelian T-dual of $AdS_3\times S^3\times T^4$ supported with Ramond flux.
Assessing Eating Disorder Risk: The Pivotal Role of Achievement Anxiety, Depression and Female Gender in Non-Clinical Samples
Konstantinos C. Fragkos,Christos C. Frangos
Nutrients , 2013, DOI: 10.3390/nu5030811
Abstract: The objective of the present study was to assess factors predicting eating disorder risk in a sample of undergraduate students. A structured questionnaire was employed on a random sample ( n = 1865) consisting of the following sections: demographics, SCOFF (Sick, Control, One stone, Fat, Food) questionnaire for screening eating disorders and the Achievement Anxiety Test and the Depression, Anxiety and Stress Scale. The students at risk for eating disorders (SCOFF score ≥2) were 39.7%. Eating disorder risk was more frequent in females, students with divorced parents, students who lived alone, students who were seeking a romantic relationship or were married, students who were at a post-secondary vocational institute/college (private-public) educational level and who were more likely to have marks under merit level. Also, the mean scores for the psychological factors of depression, stress and anxiety were higher in students with eating disorder risk. A logistic regression model was produced depicting that depression, stress, female gender, being married and searching for a romantic relationship were risk factors of having an eating disorder risk. The suggested psychological model examined with structural equation modelling signified the role of academic anxiety as an immediate precursor of general anxiety. Hence, college populations in Greece need organized infrastructures of nutrition health services and campaigns to assist in reducing the risk of eating disorders.
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