The Experts below are selected from a list of 321 Experts worldwide ranked by ideXlab platform
Elias Panagiotopoulos - One of the best experts on this subject based on the ideXlab platform.
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Posterior shoulder fracture–dislocation: an update with treatment algorithm
European Journal of Orthopaedic Surgery & Traumatology, 2017Co-Authors: Zinon T Kokkalis, Ilias D. Iliopoulos, Georgia Antoniou, Thekla Antoniadou, Andreas F Mavrogenis, Elias PanagiotopoulosAbstract:Posterior shoulder fracture–dislocation is a rare injury accounting for approximately 0.9 % of shoulder fracture–dislocations. Impression fractures of the articular surface of the humeral Head, followed by humeral neck fractures and fractures of the lesser and grater tuberosity, are the more common associated fractures. Multiple mechanisms have been implicated in the etiology of this traumatic entity most commonly resulting from forced muscle contraction as in epileptic seizures, electric shock or electroconvulsive therapy, major trauma such as motor vehicle accidents or other injuries involving axial loading of the arm, in an adducted, flexed and internally rotated position. Despite its’ scarce appearance in daily clinical practice, posterior shoulder dislocation is of significant diagnostic and therapeutic interest because of its predilection for age groups of high functional demands (35–55 years old), in addition to high incidence of missed initial diagnosis ranging up to 79 % in some studies. Several treatment options have also been proposed to address this type of injury, ranging from non-surgical methods to humeral Head Reconstruction procedures or arthroplasty with no clear consensus over definitive treatment guidelines, reflecting the complexity of this injury in addition to the limited evidence provided by the literature. To enhance the literature, this article aims to present the current concepts for the diagnosis, evaluation and treatment of the patients with posterior fracture–dislocation shoulder, and to present a treatment algorithm based on the literature review and our own experience.
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posterior shoulder fracture dislocation an update with treatment algorithm
European Journal of Orthopaedic Surgery and Traumatology, 2017Co-Authors: Zinon T Kokkalis, Ilias D. Iliopoulos, Georgia Antoniou, Thekla Antoniadou, Andreas F Mavrogenis, Elias PanagiotopoulosAbstract:Posterior shoulder fracture–dislocation is a rare injury accounting for approximately 0.9 % of shoulder fracture–dislocations. Impression fractures of the articular surface of the humeral Head, followed by humeral neck fractures and fractures of the lesser and grater tuberosity, are the more common associated fractures. Multiple mechanisms have been implicated in the etiology of this traumatic entity most commonly resulting from forced muscle contraction as in epileptic seizures, electric shock or electroconvulsive therapy, major trauma such as motor vehicle accidents or other injuries involving axial loading of the arm, in an adducted, flexed and internally rotated position. Despite its’ scarce appearance in daily clinical practice, posterior shoulder dislocation is of significant diagnostic and therapeutic interest because of its predilection for age groups of high functional demands (35–55 years old), in addition to high incidence of missed initial diagnosis ranging up to 79 % in some studies. Several treatment options have also been proposed to address this type of injury, ranging from non-surgical methods to humeral Head Reconstruction procedures or arthroplasty with no clear consensus over definitive treatment guidelines, reflecting the complexity of this injury in addition to the limited evidence provided by the literature. To enhance the literature, this article aims to present the current concepts for the diagnosis, evaluation and treatment of the patients with posterior fracture–dislocation shoulder, and to present a treatment algorithm based on the literature review and our own experience.
Jezekiel Ben-arie - One of the best experts on this subject based on the ideXlab platform.
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View invariant Head recognition by Hybrid PCA based Reconstruction
Integrated Computer-Aided Engineering, 2008Co-Authors: Jezekiel Ben-arieAbstract:We propose a novel method for 3D Head Reconstruction and view-invariant recognition from single 2D images. We employ a deterministic Shape From Shading (SFS) method with initial conditions estimated by Hybrid Principal Component Analysis (HPCA) and multi-level global optimization with error-dependent smoothness and integrability constraints. Our HPCA algorithm provides good initial estimates of 3D range mapping for the SFS optimization and yields much improved 3D Head Reconstruction. The paper also presents novel approaches to global optimization. It also describes a novel method in SFS handling of variable and unknown surface albedo, a problem with unsatisfactory solutions by prevalent SFS methods. In the experiments, we reconstruct 3D Head range images from 2D single images in different views. The 3D Reconstructions are then used to recognize stored model persons. This enables one to recognize faces in wide range of views. Empirical results show that our HPCA based SFS method provides 3D Head Reconstructions that notably improve the accuracy compared to other approaches. 3D Reconstructions derived from images of 40 persons are tested against 80 3D Head models and a recognition rate of over 90% is achieved. Such a capability was not demonstrated by any other method for view-invariant face recognition.
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Hybrid PCA based shape from shading for 3D Head Reconstruction
2007 IEEE International Conference on Electro Information Technology, 2007Co-Authors: Jezekiel Ben-arieAbstract:This paper describes a novel method for 3D Head Reconstruction by shape from shading (SFS) with initial conditions estimated using hybrid principal component analysis (HPCA). Prevalent Shape from Shading methods do not achieve good results on realistic images if a close initial estimation of the true surface is unavailable. This happens frequently in practical situations. To overcome this problem, we propose a novel shape from shading method which is based on multiple-level optimization with initial conditions derived by HPCA algorithm. We find that the HPCA algorithm provides reliable surface estimation that serves as initial conditions for the multiple-level optimization. The proposed method is also insensitive to albedo variations that frequently occur on Head surfaces. Experimental results show that the method achieves accurate Reconstruction of human Heads.
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AMFG - View invariant Head recognition by hybrid PCA based Reconstruction
Analysis and Modeling of Faces and Gestures, 1Co-Authors: Jezekiel Ben-arieAbstract:We propose a novel method for 3D Head Reconstruction and view-invariant recognition from single 2D images. We employ a deterministic Shape From Shading (SFS) method with initial conditions estimated by Hybrid Principal Component Analysis (HPCA) and multi-level global optimization with error-dependent smoothness and integrability constraints. Our HPCA algorithm provides initial estimates of 3D range mapping for the SFS optimization, which is quite accurate and yields much improved 3D Head Reconstruction. The paper also includes significant contributions in novel approaches to global optimization and in SFS handling of variable and unknown surface albedo, a problem with unsatisfactory solutions by prevalent SFS methods. In the experiments, we reconstruct 3D Head range images from 2D single images in different views. The 3D Reconstructions are then used to recognize stored model persons. Empirical results show that our HPCA based SFS method provides 3D Head Reconstructions that notably improve the accuracy compared to other approaches. 3D Reconstructions derived from side view (profile) images of 40 persons are tested against 80 3D Head models and a recognition rate of over 90% is achieved. Such a capability was not demonstrated by any other method we are aware of.
Zinon T Kokkalis - One of the best experts on this subject based on the ideXlab platform.
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Posterior shoulder fracture–dislocation: an update with treatment algorithm
European Journal of Orthopaedic Surgery & Traumatology, 2017Co-Authors: Zinon T Kokkalis, Ilias D. Iliopoulos, Georgia Antoniou, Thekla Antoniadou, Andreas F Mavrogenis, Elias PanagiotopoulosAbstract:Posterior shoulder fracture–dislocation is a rare injury accounting for approximately 0.9 % of shoulder fracture–dislocations. Impression fractures of the articular surface of the humeral Head, followed by humeral neck fractures and fractures of the lesser and grater tuberosity, are the more common associated fractures. Multiple mechanisms have been implicated in the etiology of this traumatic entity most commonly resulting from forced muscle contraction as in epileptic seizures, electric shock or electroconvulsive therapy, major trauma such as motor vehicle accidents or other injuries involving axial loading of the arm, in an adducted, flexed and internally rotated position. Despite its’ scarce appearance in daily clinical practice, posterior shoulder dislocation is of significant diagnostic and therapeutic interest because of its predilection for age groups of high functional demands (35–55 years old), in addition to high incidence of missed initial diagnosis ranging up to 79 % in some studies. Several treatment options have also been proposed to address this type of injury, ranging from non-surgical methods to humeral Head Reconstruction procedures or arthroplasty with no clear consensus over definitive treatment guidelines, reflecting the complexity of this injury in addition to the limited evidence provided by the literature. To enhance the literature, this article aims to present the current concepts for the diagnosis, evaluation and treatment of the patients with posterior fracture–dislocation shoulder, and to present a treatment algorithm based on the literature review and our own experience.
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posterior shoulder fracture dislocation an update with treatment algorithm
European Journal of Orthopaedic Surgery and Traumatology, 2017Co-Authors: Zinon T Kokkalis, Ilias D. Iliopoulos, Georgia Antoniou, Thekla Antoniadou, Andreas F Mavrogenis, Elias PanagiotopoulosAbstract:Posterior shoulder fracture–dislocation is a rare injury accounting for approximately 0.9 % of shoulder fracture–dislocations. Impression fractures of the articular surface of the humeral Head, followed by humeral neck fractures and fractures of the lesser and grater tuberosity, are the more common associated fractures. Multiple mechanisms have been implicated in the etiology of this traumatic entity most commonly resulting from forced muscle contraction as in epileptic seizures, electric shock or electroconvulsive therapy, major trauma such as motor vehicle accidents or other injuries involving axial loading of the arm, in an adducted, flexed and internally rotated position. Despite its’ scarce appearance in daily clinical practice, posterior shoulder dislocation is of significant diagnostic and therapeutic interest because of its predilection for age groups of high functional demands (35–55 years old), in addition to high incidence of missed initial diagnosis ranging up to 79 % in some studies. Several treatment options have also been proposed to address this type of injury, ranging from non-surgical methods to humeral Head Reconstruction procedures or arthroplasty with no clear consensus over definitive treatment guidelines, reflecting the complexity of this injury in addition to the limited evidence provided by the literature. To enhance the literature, this article aims to present the current concepts for the diagnosis, evaluation and treatment of the patients with posterior fracture–dislocation shoulder, and to present a treatment algorithm based on the literature review and our own experience.
Ilias D. Iliopoulos - One of the best experts on this subject based on the ideXlab platform.
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Posterior shoulder fracture–dislocation: an update with treatment algorithm
European Journal of Orthopaedic Surgery & Traumatology, 2017Co-Authors: Zinon T Kokkalis, Ilias D. Iliopoulos, Georgia Antoniou, Thekla Antoniadou, Andreas F Mavrogenis, Elias PanagiotopoulosAbstract:Posterior shoulder fracture–dislocation is a rare injury accounting for approximately 0.9 % of shoulder fracture–dislocations. Impression fractures of the articular surface of the humeral Head, followed by humeral neck fractures and fractures of the lesser and grater tuberosity, are the more common associated fractures. Multiple mechanisms have been implicated in the etiology of this traumatic entity most commonly resulting from forced muscle contraction as in epileptic seizures, electric shock or electroconvulsive therapy, major trauma such as motor vehicle accidents or other injuries involving axial loading of the arm, in an adducted, flexed and internally rotated position. Despite its’ scarce appearance in daily clinical practice, posterior shoulder dislocation is of significant diagnostic and therapeutic interest because of its predilection for age groups of high functional demands (35–55 years old), in addition to high incidence of missed initial diagnosis ranging up to 79 % in some studies. Several treatment options have also been proposed to address this type of injury, ranging from non-surgical methods to humeral Head Reconstruction procedures or arthroplasty with no clear consensus over definitive treatment guidelines, reflecting the complexity of this injury in addition to the limited evidence provided by the literature. To enhance the literature, this article aims to present the current concepts for the diagnosis, evaluation and treatment of the patients with posterior fracture–dislocation shoulder, and to present a treatment algorithm based on the literature review and our own experience.
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posterior shoulder fracture dislocation an update with treatment algorithm
European Journal of Orthopaedic Surgery and Traumatology, 2017Co-Authors: Zinon T Kokkalis, Ilias D. Iliopoulos, Georgia Antoniou, Thekla Antoniadou, Andreas F Mavrogenis, Elias PanagiotopoulosAbstract:Posterior shoulder fracture–dislocation is a rare injury accounting for approximately 0.9 % of shoulder fracture–dislocations. Impression fractures of the articular surface of the humeral Head, followed by humeral neck fractures and fractures of the lesser and grater tuberosity, are the more common associated fractures. Multiple mechanisms have been implicated in the etiology of this traumatic entity most commonly resulting from forced muscle contraction as in epileptic seizures, electric shock or electroconvulsive therapy, major trauma such as motor vehicle accidents or other injuries involving axial loading of the arm, in an adducted, flexed and internally rotated position. Despite its’ scarce appearance in daily clinical practice, posterior shoulder dislocation is of significant diagnostic and therapeutic interest because of its predilection for age groups of high functional demands (35–55 years old), in addition to high incidence of missed initial diagnosis ranging up to 79 % in some studies. Several treatment options have also been proposed to address this type of injury, ranging from non-surgical methods to humeral Head Reconstruction procedures or arthroplasty with no clear consensus over definitive treatment guidelines, reflecting the complexity of this injury in addition to the limited evidence provided by the literature. To enhance the literature, this article aims to present the current concepts for the diagnosis, evaluation and treatment of the patients with posterior fracture–dislocation shoulder, and to present a treatment algorithm based on the literature review and our own experience.
Georgia Antoniou - One of the best experts on this subject based on the ideXlab platform.
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Posterior shoulder fracture–dislocation: an update with treatment algorithm
European Journal of Orthopaedic Surgery & Traumatology, 2017Co-Authors: Zinon T Kokkalis, Ilias D. Iliopoulos, Georgia Antoniou, Thekla Antoniadou, Andreas F Mavrogenis, Elias PanagiotopoulosAbstract:Posterior shoulder fracture–dislocation is a rare injury accounting for approximately 0.9 % of shoulder fracture–dislocations. Impression fractures of the articular surface of the humeral Head, followed by humeral neck fractures and fractures of the lesser and grater tuberosity, are the more common associated fractures. Multiple mechanisms have been implicated in the etiology of this traumatic entity most commonly resulting from forced muscle contraction as in epileptic seizures, electric shock or electroconvulsive therapy, major trauma such as motor vehicle accidents or other injuries involving axial loading of the arm, in an adducted, flexed and internally rotated position. Despite its’ scarce appearance in daily clinical practice, posterior shoulder dislocation is of significant diagnostic and therapeutic interest because of its predilection for age groups of high functional demands (35–55 years old), in addition to high incidence of missed initial diagnosis ranging up to 79 % in some studies. Several treatment options have also been proposed to address this type of injury, ranging from non-surgical methods to humeral Head Reconstruction procedures or arthroplasty with no clear consensus over definitive treatment guidelines, reflecting the complexity of this injury in addition to the limited evidence provided by the literature. To enhance the literature, this article aims to present the current concepts for the diagnosis, evaluation and treatment of the patients with posterior fracture–dislocation shoulder, and to present a treatment algorithm based on the literature review and our own experience.
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posterior shoulder fracture dislocation an update with treatment algorithm
European Journal of Orthopaedic Surgery and Traumatology, 2017Co-Authors: Zinon T Kokkalis, Ilias D. Iliopoulos, Georgia Antoniou, Thekla Antoniadou, Andreas F Mavrogenis, Elias PanagiotopoulosAbstract:Posterior shoulder fracture–dislocation is a rare injury accounting for approximately 0.9 % of shoulder fracture–dislocations. Impression fractures of the articular surface of the humeral Head, followed by humeral neck fractures and fractures of the lesser and grater tuberosity, are the more common associated fractures. Multiple mechanisms have been implicated in the etiology of this traumatic entity most commonly resulting from forced muscle contraction as in epileptic seizures, electric shock or electroconvulsive therapy, major trauma such as motor vehicle accidents or other injuries involving axial loading of the arm, in an adducted, flexed and internally rotated position. Despite its’ scarce appearance in daily clinical practice, posterior shoulder dislocation is of significant diagnostic and therapeutic interest because of its predilection for age groups of high functional demands (35–55 years old), in addition to high incidence of missed initial diagnosis ranging up to 79 % in some studies. Several treatment options have also been proposed to address this type of injury, ranging from non-surgical methods to humeral Head Reconstruction procedures or arthroplasty with no clear consensus over definitive treatment guidelines, reflecting the complexity of this injury in addition to the limited evidence provided by the literature. To enhance the literature, this article aims to present the current concepts for the diagnosis, evaluation and treatment of the patients with posterior fracture–dislocation shoulder, and to present a treatment algorithm based on the literature review and our own experience.
