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Development and evaluation of a new methodology for Soft Tissue Artifact compensation in the lower limb.

Bhrigu K Lahkar, Pierre-Yves Rohan, Ayman Assi, Helene Pillet, Xavier Bonnet, Patricia Thoreux, Wafa Skalli,

Skin Marker (SM) based motion capture is the most widespread technique used for motion analysis. Yet, the accuracy is often hindered by Soft Tissue Artifact (STA). This is a major issue in clinical gait analysis where kinematic results are used for decision-making. It also has a considerable influence on the ... Read more >>

J Biomech (Journal of biomechanics)
[2021, 122:110464]

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SARS-CoV-2 vaccination modelling for safe surgery to save lives: data from an international prospective cohort study.

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<h4>Background</h4>Preoperative SARS-CoV-2 vaccination could support safer elective surgery. Vaccine numbers are limited so this study aimed to inform their prioritization by modelling.<h4>Methods</h4>The primary outcome was the number needed to vaccinate (NNV) to prevent one COVID-19-related death in 1 year. NNVs were based on postoperative SARS-CoV-2 rates and mortality in an ... Read more >>

Br J Surg (The British journal of surgery)
[2021, :]

Cited: 1 time

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Evaluation of Microdissection Testicular Sperm Extraction (mTESE), Outcomes and Predictive Factors in Ireland: The Gold Standard for Men with Non-Obstructive Azoospermia.

Pat Rohan, Niamh Daly, Aoife O'Kelly, Martin O'Leary, Tim Dineen, Nigam Shah, Padraig Daly, John Waterstone, Ivor Cullen,

<h4>Background</h4>Microdissection testicular sperm extraction (mTESE) is the gold standard approach in sperm retrieval in men with non-obstructive azoospermia (NOA). The purpose of the study was to assess the outcomes for Irish men who have undergone mTESE with a single surgeon.<h4>Methods</h4>This is a retrospective, single cohort study. Thirty-four patients underwent mTESE ... Read more >>

J Reprod Infertil (Journal of reproduction & infertility)
[2021, 22(2):103-109]

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Emergency urolithiasis management at a national level: exploring the need for a care pathway.

Pat Rohan, Conor Casey, Gregory J Nason, Jan Sorensen, Kenneth Mealy,

<h4>Background</h4>Urolithiasis is a common urological presentation<sup>1</sup>. A total of 25-49 million people in Europe live with symptomatic stone disease, with the incidence increasing<sup>1</sup>.<h4>Aims</h4>To examine length of stay (LOS) and transfer patterns for patients presenting with urolithiasis to Irish Model 2/3 hospitals without a specialist urology service, compared with those who ... Read more >>

Ir J Med Sci (Irish journal of medical science)
[2021, :]

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Experimental quantification of soft tissue deformation in quasi-static single leg flexion using biplanar imaging

Bhrigu Lahkar, Pierre-Yves Rohan, Jean-Jacques Yaacoub, Helene Pillet, Xavier Bonnet, Patricia Thoreux, Wafa Skalli,

Soft tissue deformation(STD) causes the most prominent source of error in skin marker (SM) based motion analysis, commonly referred to as Soft Tissue Artifact (STA). To compensate for its effect and to accurately assess in vivo joint kinematics, quantification of STD in three-dimension (3D) is essential. In the literature, different ... Read more >>

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Timing of surgery following SARS-CoV-2 infection: an international prospective cohort study.

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Peri-operative SARS-CoV-2 infection increases postoperative mortality. The aim of this study was to determine the optimal duration of planned delay before surgery in patients who have had SARS-CoV-2 infection. This international, multicentre, prospective cohort study included patients undergoing elective or emergency surgery during October 2020. Surgical patients with pre-operative SARS-CoV-2 ... Read more >>

Anaesthesia (Anaesthesia)
[2021, 76(6):748-758]

Cited: 8 times

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Development and evaluation of a new methodology for Soft Tissue Artifact compensation in the lower limb

Bhrigu Lahkar, Pierre-Yves Rohan, Ayman Assi, Helene Pillet, Xavier Bonnet, Patricia Thoreux, Wafa Skalli,

Skin Marker (SM) based motion capture is the most widespread technique used for motion analysis. Yet, the accuracy is often hindered by Soft Tissue Artifact (STA). This is a major issue in clinical gait analysis where kinematic results are used for decision-making. It also has a considerable influence on the ... Read more >>

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Development and evaluation of a new procedure for subject-specific tensioning of finite element knee ligaments.

Bhrigu K Lahkar, Pierre-Yves Rohan, Helene Pillet, Patricia Thoreux, Wafa Skalli,

Subject-specific tensioning of ligaments is essential for the stability of the knee joint and represents a challenging aspect in the development of finite element models. We aimed to introduce and evaluate a new procedure for the quantification of ligament prestrains from biplanar X-ray and CT data. Subject-specific model evaluation was ... Read more >>

Comput Methods Biomech Biomed Engin (Computer methods in biomechanics and biomedical engineering)
[2021, :1-12]

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Combining Freehand Ultrasound-Based Indentation and Inverse Finite Element Modeling for the Identification of Hyperelastic Material Properties of Thigh Soft Tissues.

Nolwenn Fougeron, Pierre-Yves Rohan, Diane Haering, Jean-Loïc Rose, Xavier Bonnet, Hélène Pillet,

Finite element analysis (FEA) is a numerical modeling tool vastly employed in research facilities to analyze and predict load transmission between the human body and a medical device, such as a prosthesis or an exoskeleton. Yet, the use of finite element modeling (FEM) in a framework compatible with clinical constraints ... Read more >>

J Biomech Eng (Journal of biomechanical engineering)
[2020, 142(9):]

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Frailty Index: A Useful Stratification for Elderly Surgical Patients.

P Rohan, M K O'Reilly, G J Nason,

Ir Med J (Irish medical journal)
[2020, 113(6):106]

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Digital twinning of Cellular Capsule Technology: emerging outcomes from the perspective of porous media mechanics

Stéphane Urcun, Pierre-Yves Rohan, Wafa Skalli, Pierre Nassoy, Stephane Pierre Alain Bordas, Giuseppe Sciume,

Spheroids encapsulated within alginate capsules are emerging as suitable in vitro tools to investigate the impact of mechanical forces on tumor growth since the internal tumor pressure can be retrieved from the deformation of the capsule. Here we focus in particular on the Cellular Capsule Technology (CCT). We show that ... Read more >>

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Provision of Service During the Covid-19 Pandemic

G J Nason, P Rohan, M K O'Reilly,

Ir Med J (Irish medical journal)
[2020, 113(4):48]

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Supply of Personal Protective Equipment (PPE) During the Covid-19 Pandemic.

P Rohan, M K O'Reilly, B Gibney, G J Nason,

Ir Med J (Irish medical journal)
[2020, 113(4):66]

Cited: 2 times

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Artificial Intelligence - Changing the Field of Prostate Cancer?

P Rohan, M K O'Reilly, G J Nason,

Ir Med J (Irish medical journal)
[2020, 113(3):45]

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The Future of Irish Urology - Are We Planning Ahead Appropriately?

P Rohan, C O'Connell, G J Nason, K J O'Malley,

Ir Med J (Irish medical journal)
[2020, 113(2):30]

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Combined 3D analysis of lower-limb morphology and function in children with idiopathic equinovarus clubfoot: A preliminary study.

Virginie Rampal, Pierre-Yves Rohan, Helene Pillet, Aurore Bonnet-Lebrun, Mickael Fonseca, Eric Desailly, Philippe Wicart, Wafa Skalli,

<h4>Introduction</h4>In children treated for idiopathic equinovarus clubfoot (EVCF), the relation between morphologic defects on clinical examination and standard X-ray on the one hand and functional abnormalities on the other is difficult to objectify. The aim of the present study was to demonstrate the feasibility of combined 3D analysis of the ... Read more >>

Orthop Traumatol Surg Res (Orthopaedics & traumatology, surgery & research : OTSR)
[2020, 106(7):1333-1337]

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Is a simplified Finite Element model of the gluteus region able to capture the mechanical response of the internal soft tissues under compression?

Aurélien Macron, Hélène Pillet, Jennifer Doridam, Isabelle Rivals, Mohammad Javad Sadeghinia, Alexandre Verney, Pierre-Yves Rohan,

BACKGROUND:Internal soft tissue strains have been shown to be one of the main factors responsible for the onset of Pressure Ulcers and to be representative of its risk of development. However, the estimation of this parameter using Finite Element (FE) analysis in clinical setups is currently hindered by costly acquisition, ... Read more >>

Clin Biomech (Bristol, Avon) (Clinical biomechanics (Bristol, Avon))
[2020, 71:92-100]

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Is the Current Consent Process Appropriate for Patients and Fair to Newly Qualified Doctors?

P Rohan, G D Keane, C O’Connell, M K O’Reilly, G J Nason,

Ir Med J (Irish medical journal)
[2019, 112(6):959]

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Microstructural characterization of annulus fibrosus by ultrasonography: a feasibility study with an in vivo and in vitro approach.

Tristan Langlais, Pierre Desprairies, Raphael Pietton, Pierre-Yves Rohan, Jean Dubousset, Judith R Meakin, Peter C Winlove, Raphael Vialle, Wafa Skalli, Claudio Vergari,

The main function of the intervertebral disc is biomechanical function, since it must resist repetitive high loadings, while giving the spine its flexibility and protecting the spinal cord from over-straining. It partially owes its mechanical characteristics to the lamellar architecture of its outer layer, the annulus fibrosus. Today, no non-invasive ... Read more >>

Biomech Model Mechanobiol (Biomechanics and modeling in mechanobiology)
[2019, 18(6):1979-1986]

Cited: 1 time

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Assessing 3D paediatric foot morphology using low-dose biplanar radiography: Parameter reproducibility and preliminary values.

Virginie Rampal, Pierre-Yves Rohan, Rebekah Saksik, Philippe Wicart, Wafa Skalli,

<h4>Background</h4>The physical examination and weight-bearing radiography are the two main available methods for assessing the feet and lower limbs. The anatomy and function of these two structures interact with each other. These two assessment methods are affected by subjectivity and projection bias. Low-dose biplanar radiography (LDBR) is now a promising ... Read more >>

Orthop Traumatol Surg Res (Orthopaedics & traumatology, surgery & research : OTSR)
[2018, 104(7):1083-1089]

Cited: 0 times

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Development and evaluation of a new methodology for the fast generation of patient-specific Finite Element models of the buttock for sitting-acquired deep tissue injury prevention.

Aurélien Macron, Hélène Pillet, Jennifer Doridam, Alexandre Verney, Pierre-Yves Rohan,

The occurrence and management of Pressure Ulcers remain a major issue for patients with reduced mobility and neurosensory loss despite significant improvement in the prevention methods. These injuries are caused by biological cascades leading from a given mechanical loading state in tissues to irreversible tissue damage. Estimating the internal mechanical ... Read more >>

J Biomech (Journal of biomechanics)
[2018, 79:173-180]

Cited: 0 times

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Feasibility of sub-dermal soft tissue deformation assessment using B-mode ultrasound for pressure ulcer prevention.

J Doridam, A Macron, C Vergari, A Verney, P-Y Rohan, H Pillet,

Pressure Ulcer (PU) prevention remains a main public health issue. The physio-pathology of this injury is not fully understood, and a satisfactory therapy is currently not available. Recently, several works suggested that mechanical strains are responsible of deformation-induced damage involved in the initiation of Deep Tissue Injury (DTI). A better ... Read more >>

J Tissue Viability (Journal of tissue viability)
[2018, 27(4):238-243]

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Three-Dimensional Reconstruction of Foot in the Weightbearing Position From Biplanar Radiographs: Evaluation of Accuracy and Reliability.

Pierre-Yves Rohan, Antoine Perrier, Mira Ramanoudjame, Jérôme Hausselle, Henri Lelièvre, Raphael Seringe, Wafa Skalli, Philippe Wicart,

The initial assessment and postoperative monitoring of patients with various abnormalities of the foot in clinical routine practice is primarily based on the analysis of radiographs taken in the weightbearing position. Conventional x-ray imaging, however, only provides a 2-dimensional projection of 3-dimensional (3D) bony structures, and the clinical parameters assessed ... Read more >>

J Foot Ankle Surg (The Journal of foot and ankle surgery : official publication of the American College of Foot and Ankle Surgeons)
[2018, 57(5):931-937]

Cited: 1 time

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Is The Consent Process Appropriate - The Interns’ Perspective?

P Rohan, K Keane, G J Nason, R H Caulfield,

Aims Consent is an integral component to any medical procedure involving a competent patient, a communicating doctor, and transfer of information about the procedure. The aim of this study was to assess interns’ experience of the consent process. Methods An online questionnaire was distributed to interns in Ireland questioning their role in the ... Read more >>

Ir Med J (Irish medical journal)
[2018, 111(4):734]

Cited: 0 times

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Subject specific finite element mesh generation of the pelvis from biplanar x-ray images: application to 120 clinical cases.

Nolwenn Fougeron, Pierre-Yves Rohan, Aurélien Macron, Christophe Travert, Hélène Pillet, Wafa Skalli,

Several Finite Element (FE) models of the pelvis have been developed to comprehensively assess the onset of pathologies and for clinical and industrial applications. However, because of the difficulties associated with the creation of subject-specific FE mesh from CT scan and MR images, most of the existing models rely on ... Read more >>

Comput Methods Biomech Biomed Engin (Computer methods in biomechanics and biomedical engineering)
[2018, 21(5):408-412]

Cited: 0 times

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