Elongating prosthesis

BACKGROUND: The introduction of a transapical transcatheter beating heart replacement system has significantly expanded therapeutic options for patients with severely diseased mitral valves, particularly those ineligibles for traditional surgery or transcatheter repair. However, challenges, such as left ventricular outflow tract obstruction (LVOT-O) and the risk of dynamic systolic anterior motion (SAM) in cases with elongated anterior mitral leaflet (AML) post-prosthesis implantation, impede the widespread adoption of transcatheter mitral valve replacement (TMVR)...

Hemifacial hyperplasia (HFH) is a rare congenital disorder characterized by marked unilateral overgrowth of the facial tissues. A subtype of HFH is congenital infiltrating lipomatosis of the face (CIL-F). This disease is characterized by unilateral diffuse infiltration of mature adipose cells in the facial soft tissue and is associated with skeletal hypertrophy. This work aims to report a case of a CIL-F patient with right facial asymmetry and progressive growth at adolescent age, causing mandibular asymmetry due to signs of concomitant unilateral condylar hyperplasia...

INTRODUCTION: Gender affirming surgery is common among transgender and gender-nonconforming individuals. Genital gender-affirming surgery is a form of surgery that involves transformation and reconstruction of the genitalia while maintaining urologic and sexual function. Masculinizing genital gender-affirming surgery can involve the removal of the female genital and reproductive organs and the creation of a more masculine appearance by using phalloplasty or metoidioplasty techniques. While metoidioplasty has advantages such as limited scarring and preserved genital sensation and clitoral erection, it may not always guarantee the ability to void while standing or even penetrate a sexual partner...

This study questions the aging of non-implanted breast prostheses for a period of 9-60 months. Every 6 months, two non-implanted Natrelle™ prostheses were tested to measure the strength at break, the elongation at break, and the thickness of the shell. Then, the breaking stress was calculated from the preceding quantities. All these quantities were observed by separating the samples taken from the anterior and posterior sides of the prostheses. One-way ANOVA analyses (analysis of variance) were performed to define the influence of aging duration, lot membership, and side...

BACKGROUND: Lifetime elongation of the silicone voice rubber prostheses by inhibition of biofilm formation is a primary objective in voice restoration of laryngectomized patients. This systematic review sought to explore the existing strategies in this direction. MATERIALS: We conducted a systematic search of both in vitro and in vivo literature published in PubMed, Scopus, and Cochrane Central Register of Controlled Trials, until December 31, 2022, for published and unpublished trials assessing the strategies for inhibiting biofilm formation on silicone rubber voice prostheses, and appraised quality assessment with the modified Consolidated Standards of Reporting Trials tool...

THE AIM OF THE STUDY: Was to develop and evaluate the physical and mechanical properties of a structural material for the manufacture of facial epithesis using photopolymer printing technology. MATERIALS AND METHODS: The study of the physical and mechanical properties of the developed structural material consisted of measuring the Shore hardness; determination of material strength at break, conditional yield strength, relative elongation at break and modulus of elasticity; the study of the characteristics described above, after artificial aging, simulating the daily use of a prosthesis...

Preclinical evaluation of total knee arthroplasty (TKA) components is essential to understanding their mechanical behavior and developing strategies for improving joint stability. While preclinical testing of TKA components has been useful in quantifying their effectiveness, such testing can be criticized for lacking clinical relevance, as the important contributions of surrounding soft tissues are either neglected or greatly simplified. The purpose of our study was to develop and determine if subject-specific virtual ligaments reproduce a similar behavior as native ligaments surrounding TKA joints...

BACKGROUND: Hemiarthroplasty following tumor resection of the distal femur in children provides a chance to preserve the proximal tibial physis for limb elongation. Based on three-dimensional (3D) printing technology, the uncemented unipolar prosthesis with joint stability reinforced structures (JSRSs) was custom-designed for our cases. This study aimed to describe the design and assess the short-term outcomes of this refined prosthetic hemiarthroplasty. METHODS: Seven patients (four females and three males) received 3D-printed customized uncemented unipolar prosthesis for hemiarthroplasty after removal of the distal femur, from September 2019 to October 2020 at our Orthopedics department...

OBJECTIVES: To assess the endograft position and aortic geometry changes after TEVAR and FET in dSINE patients. METHODS: In this retrospective cohort study the baseline demographic and the follow-up data were extracted from the hospital records, and CT scans of dSINE patients after TEVAR or FET between 2011 and 2021 were analyzed regarding endograft oversizing, length and migration, taper ratio, aortic diameter at the endograft end, aortic elongation (thoracic inner and outer curvature), wedge apposition angle, and tortuosity angle in the distal landing zone...

OBJECTIVE: To improve upon the toggle-pin implant construction and develop a repeatable surgical technique to achieve coxofemoral stabilization in mature cattle. ANIMALS: 9 adult bovine cadaveric coxofemoral joints, 8 bovine femurs, 2 beef calf cadavers. PROCEDURES: Ultimate tensile strength and elongation at failure were measured for the native ligament of the head of the femur (LOHOF) harvested up to 48 hours after death, and the prosthetic prototype utilizing stainless-steel cable and prosthetic prototype utilizing nylon leader line were compared...

Triplex (Terumo Corp, Tokyo, Japan) is a relatively new vascular protheses with a non-biodegradable coating material. We experienced two cases of graft elongation in Triplex grafts post-operatively. In one of the cases, the graft elongation led to occlusion of the left subclavian artery. In the other case, the graft elongation resulted in a pseudoaneurysm of the ascending aorta. A unique feature of Triplex grafts is that they may reduce post-operative inflammation reaction; however, they could also invite a limited adhesion formation with the surrounding tissue, which contribute to prostheses elongation, due to a lack of prostheses stability and fixation...

BACKGROUND: To determine the ideal fixation technique for an ACL reconstruction with a hamstring graft, multiple studies have been undertaken to define the initial biomechanical properties of tibial fixation. PURPOSE: The aim of this study was to compare the biomechanical properties of tibial fixation methods by creating single or hybrid systems. METHODS: Bovine tibias and forefoot digital extensor tendons were prepared with four different tibial anterior cruciate ligament fixation methods and compared biomechanically...

AIM: Percutaneous transluminal angioplasty or cephalic vein transposition to the axillary vein is mainly used for treatment of cephalic arch stenosis, a common complication of brachiocephalic fistulas. However, the results of such interventions have been disappointing. METHODS: We used a polytetrafluoroethylene prosthesis with a 6-mm diameter to bridge the cephalic vein and the ipsilateral external jugular vein, and successfully created a new drainage outlet and established immediate restoration of flow through brachiocephalic fistulas...

INTRODUCTION: Mandibular prognathism manifests as elongation of the mandible in the anteroposterior direction, resulting in a sunken appearance of the middle third of the face and sad look of the eyes. It adversely affects esthetics, function, and oral health, reducing the patients' self-esteem. It therefore presents a significant challenge. PRESENTATION OF CASE: A 23-year-old woman presented with prognathic features characterized by mandibular protrusion, maxillary retrusion, a prominent chin, and reduce self-esteem...

INTRODUCTION: The use of reverse shoulder arthroplasty (RSA) is becoming more extended and its clinical results are good or excellent according to the literature. The main biomechanical characteristic of RSA is that it lowers and medializes the centre of rotation of the shoulder causing an arm lengthening. Although the number of neurological complications is low (5%), there are more neurophysiological changes in the brachial plexus with RSA than with the anatomic shoulder arthroplasty...

Retinal neuroprostheses are the only FDA-approved treatment option for blinding degenerative diseases. A major outstanding challenge is to develop a computational model that can accurately predict the elicited visual percepts (phosphenes) across a wide range of electrical stimuli. Here we present a phenomenological model that predicts phosphene appearance as a function of stimulus amplitude, frequency, and pulse duration. The model uses a simulated map of nerve fiber bundles in the retina to produce phosphenes with accurate brightness, size, orientation, and elongation...

Reverse shoulder arthroplasty biomechanics can be improved by modifying the placement of prosthesis. Biomechanical studies have quantified the impact of placement modifications on the mobility and stability of the reverse shoulder. While these studies have provided detailed insights, direct comparisons between their finding are obfuscated by their use of differing methodologies. The aim of our study was to develop an assessment framework which used musculoskeletal simulations to consistently evaluate the biomechanics of various placement modifications...

PURPOSE OF REVIEW: Accurate imaging of the aortic root during valve implantation is crucial for proper prosthesis positioning during TAVR. The purpose of this review was to determine if routine use of the cusp-overlap view should be adopted for self-expanding valves. RECENT FINDINGS: The use of the cusp-overlap view with the Evolut, Portico, ACURATE neo/neo2, and JenaValve systems is associated with lower post-procedural new permanent pacemaker implantation rates when compared with the standard 3-cusp view, presumably due to more precise valve implantation relative to the conduction system by the non-coronary cusp...

Performing transcatheter aortic valve implantation with high implantation technique, i.e. with an aorto-ventricular ratio > 60/40, reduces the need of permanent pacemaker implantation. Valve calcification and prosthesis oversizing are predictors of permanent pacemaker implantation, but there are no available data on their role when transcatheter aortic valve implantation is performed with an aorto-ventricular ratio > 60/40. The aim of this study was to evaluate the effect of leaflets/annulus calcification and prosthesis oversizing on the incidence of permanent pacemaker implantation after transcatheter aortic valve implantation with a high implantation technique...

INTRODUCTION: Thoracic endovascular aortic repair (TEVAR) is the first treatment option for many thoracic aortic pathologies. Especially after aortic dissections, it is possible to have progression during follow-up with appearance of new lesions on arterial wall. Herein, we report a case of Penetrating Aortic Ulcer (PAU) post release of Thoracic endoprosthesis. PRESENTATION OF CASE: A 67-years-old male with hypertension and diabetes mellitus was followed at our hospital after an emergency procedure for Type B aortic dissection (TBAD) complicated by symptomatic large infrarenal AAA and treated with a proximal TEVAR plus chimney for left subclavian artery and PETTICOAT with EVAR for abdominal aortic disease...