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Elongating prosthesis

C Belvedere, A Ensini, M d'Amato, P Barbadoro, A Leardini
PURPOSE: Physiological elongation and orientation of patellar tendon fibres are among the scopes of total knee arthroplasty, but little is known in the three dimensions. The study aims to assess in vitro these variations at the intact and replaced knee, with and without patellar resurfacing. It was hypothesised that fibre patterns differ before and after prosthesis implantation, and between specific prosthesis designs. It was also expected that patellar resurfacing would affect relevant results...
October 13, 2016: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
Marcus Neudert, Matthias Bornitz, Nikoloz Lasurashvili, Uwe Schmidt, Thomas Beleites, Thomas Zahnert
HYPOTHESIS: Prosthesis' length creates tension in ossicular reconstructions, which directly effects the middle ear sound transmission. BACKGROUND: Relatively long prostheses are often used to stabilize the middle ear reconstruction to prevent dislocation. Thereby, tension on the flexible components such as the tympanic membrane (TM) and the annular ligament (AL) is increased. Only little is known on the amount of displacement-related stiffening of the TM and AL, as well as the consecutive reduction in middle ear transfer function (METF)...
October 2016: Otology & Neurotology
Gabriele Antonini, Patrizio Vicini, Ettore De Berardinis, Arianna Pacchiarotti, Vincenzo Gentile, Paul Perito
Fibrolipomas are an infrequent type of lipomas. We describe a case of a man suffering from subcutaneous penile fibrolipoma, who twelve months earlier has been submitted to augmentative phalloplasty due to aesthetic dysmorphophobia. The same patient three years earlier has been submitted to three-component hydraulic penile prostheses implantation due to erectile dysfunction. After six months from removing of the mass, the penile elongation and penile enlargement were stable, the prostheses were correctly functioning and the patient was satisfied with his sexual intercourse and life...
December 2015: Archivio Italiano di Urologia, Andrologia
P V Popryadukhin, G I Popov, I P Dobrovolskaya, V E Yudin, V N Vavilov, G Yu Yukina, E M Ivan'kova, I O Lebedeva
Tubular grafts based on nanofibers of copolymer of ε-caprolactam and hexamethylendiaminadipate were obtained by the electrospinning method. The strength of materials based on the dry nanofibers was 6.2 MPa with elongation at break of 133%, or 7.5 MPa and 299% in saline, respectively. The pressure value at which liquid started seeping through the tube wall was P = 10 kPa. Absence of cytotoxicity was proved, as well as adhesion and proliferation of mesenchymal stem cells on the surface. Tubes with inner diameter of 1 mm were tested in vivo in rat abdominal aorta...
March 2016: Cardiovascular Engineering and Technology
Animesh Agrawal, Bae Hoon Lee, Scott A Irvine, Jia An, Ramya Bhuthalingam, Vaishali Singh, Kok Yao Low, Chee Kai Chua, Subbu S Venkatraman
A method has been developed to induce and retain a contractile phenotype for vascular smooth muscle cells, as the first step towards the development of a biomimetic blood vessel construct with minimal compliance mismatch. Melt spun PCL fibers were deposited on a mandrel to form aligned fibers of 10 μm in diameter. The fibers were bonded into aligned arrangement through dip coating in chitosan solution. This formed a surface of parallel grooves, 10 μm deep by 10 μm across, presenting a surface layer of chitosan to promote cell surface interactions...
2015: International Journal of Biomaterials
Fiona van den Heiligenberg, Scott Macdonald, Eugene Duff, David Henderson Slater, Heidi Johansen-Berg, Jody Culham, Tamar Makin
The lateral occipitotemporal cortex (LOTC) contains subregions differentially responding to specific object categories, such as body parts and tools. This selectivity may relate to action knowledge, rather than visual properties of the objects. Prosthetic limbs share different commonalities with hands and tools (in terms of both visual and action features). Specifically, cosmetic prostheses look like hands, but can be used as tools (elongate the stump), whereas functional prostheses ("hook") do not resemble hands, but can be used as such (e...
2015: Journal of Vision
Pouya Nezafati, Mohammad Hassan Nezafati, Hamid Hoseinikhah
Introduction. Unruptured sinus of valsalva aneurysm (SVA) is a rare congenital anomaly, particularly, when it coexists with a ventricular septal defect (VSD) and aortic regurgitation due to the prolapse of the elongated aortic cusp into the VSD. In this report, we present the case of a 19-year-old young man with VSD challenging in spite of dyspnea and lower limb edema. Presentation of Case. Its diagnosis was made on the basis of transthoracic echocardiography results. Surgical management consisted of replacing the SVA with mechanical valve prosthesis...
2015: Case Reports in Medicine
Yuanyuan Zhong, Zhi Chen, Feng Xue, Huamao Miao, Xingtao Zhou
PURPOSE: We assessed the relationship between axial length (AL) change and corneal refractive power change induced by orthokeratology (ortho-k) contact lens wear. METHODS: A total of 88 myopic children aged 7 to 12 years were fitted with ortho-k lenses for overnight wear. Axial length was measured before enrollment and every 6 months after initiation of lens wear up to 24 months. Corneal apical refractive power and the mean power of each concentric ring from 0.5 to 7...
July 2015: Investigative Ophthalmology & Visual Science
Márcio Bruno Figueiredo Amaral, Matheus Furtado Carvalho, André Baptista Ferreira, Ricardo Alves Mesquita
Orbital fracture associated with traumatic globe luxation is rare, as it generally requires trauma with high energy for this to occur. The present case report focused on a child who had been hit by a motorcycle, leading to a globe luxation of the left eye and fractures of the superolateral orbital walls. The patient presented initial cosmetic and psychological benefits from the repositioning of the intact globe and the reduction of the orbital fractures. However, a subsequent evisceration of the globe was required due to persistent proptosis and pain...
March 2015: Journal of Maxillofacial and Oral Surgery
Praful Choudhari, Arpita Pillai, R Zade, Ramesh Amirishetty, Sunaina Shetty
One of the most distressing aspects of periodontitis is the unesthetic appearance of maxillary and mandibular anteriors. The elongation of the crowns due to root exposure and increased interdental spacing results in unesthetic appearance. Surgical procedures for gingival recession coverage do not have acceptable results in cases of severe gingival recession. So nonsurgical methods like gingival veneers should be considered as a treatment modality in such cases. This article aims to revisit the gingival veneer: its uses, advantages, disadvantages, and its fabrication...
January 2015: Journal of Clinical and Diagnostic Research: JCDR
Fei Liu, Chenxin Chen, Jialin Niu, Jia Pei, Hua Zhang, Hua Huang, Guangyin Yuan
In this study, through a combination of hot extrusion, cold rolling and drawing, three Mg alloys, Mg-Nd-Zn-Zr (abbr. JDBM), AZ31 and WE43, were successfully fabricated into the high-quality micro-tubes with 3.00mm outer diameter and 180μm thickness for biodegradable stents. This processing method overcame the shortcoming of the poor workability of Mg alloys and could be applied to fabricate sufficiently long tubes with low dimensional errors within 2.8%. Microstructure observation demonstrated that the as-annealed JDBM, AZ31 and WE43 micro-tubes had more uniformly distributed grains with an average size of 10...
March 2015: Materials Science & Engineering. C, Materials for Biological Applications
Taketsugu Fujibuchi, Seiichi Matsumoto, Takashi Shimoji, Keisuke Ae, Taisuke Tanizawa, Tabu Gokita, Keiko Hayakawa
BACKGROUND: Endoprosthetic reconstruction of the proximal humerus is one of the standard procedures after resection of tumors of the proximal humerus and has been considered a reliable method to reconstruct the proximal humerus in recent reports. However, instability of the shoulder joint caused by loss of the rotator cuff and deltoid muscle function is often observed after such an endoprosthetic reconstruction. METHODS: We performed the endoprosthesis suspension method with polypropylene monofilament knitted mesh...
June 2015: Journal of Shoulder and Elbow Surgery
Matthew J Thompson, John R Owen, Charles L McDowell, Jennifer S Wayne
PURPOSE: To study the biomechanical characteristics (percent stretch, stiffness, and ultimate load) of 2 tendon-prosthesis techniques used to connect the proximal tendon stump to silicone active tendon implants used in reconstruction of flexor tendons. METHODS: We evaluated percent stretch following cyclic loading and at failure, stiffness during load to failure, and ultimate load of 16 tendon-prosthesis junctions using cadaveric canine flexor digitorum profundus tendons to re-create 2 junction techniques: the tendon loop (TL) and the polyester weave (PW)...
January 2015: Journal of Hand Surgery
Fahad A Al-Harbi, Neveen M Ayad, Mohamed A Saber, Aws S ArRejaie, Steven M Morgano
STATEMENT OF PROBLEM: A common reason for replacing a maxillofacial prosthesis is the deterioration of its properties. PURPOSE: The purpose of this study was to compare the effect of weathering in a hot and humid climate on the tear strength, tensile strength, modulus of elasticity, elongation percentage, and color of 3 maxillofacial materials. MATERIAL AND METHODS: Three silicone materials were tested. Specimens were exposed to outdoor weathering for 6 months in a hot and humid environment...
February 2015: Journal of Prosthetic Dentistry
Dany J Munoz-Pinto, Andrea Carolina Jimenez-Vergara, Tanmay P Gharat, Mariah S Hahn
Collagen hydrogels have been widely investigated as scaffolds for vascular tissue engineering due in part to the capacity of collagen to promote robust cell adhesion and elongation. However, collagen hydrogels display relatively low stiffness and strength, are thrombogenic, and are highly susceptible to cell-mediated contraction. In the current work, we develop and characterize a sequentially-formed interpenetrating network (IPN) that retains the benefits of collagen, but which displays enhanced mechanical stiffness and strength, improved thromboresistance, high physical stability and resistance to contraction...
February 2015: Biomaterials
Xing Zhang, Bin Xu, Daniel S Puperi, Aline L Yonezawa, Yan Wu, Hubert Tseng, Maude L Cuchiara, Jennifer L West, K Jane Grande-Allen
The development of advanced scaffolds that recapitulate the anisotropic mechanical behavior and biological functions of the extracellular matrix in leaflets would be transformative for heart valve tissue engineering. In this study, anisotropic mechanical properties were established in poly(ethylene glycol) (PEG) hydrogels by crosslinking stripes of 3.4 kDa PEG diacrylate (PEGDA) within 20 kDa PEGDA base hydrogels using a photolithographic patterning method. Varying the stripe width and spacing resulted in a tensile elastic modulus parallel to the stripes that was 4...
March 2015: Acta Biomaterialia
Sai Y Veruva, Todd H Lanman, Jorge E Isaza, Daniel W MacDonald, Steven M Kurtz, Marla J Steinbeck
BACKGROUND: Lumbar total disc replacement (L-TDR) is a procedure used to relieve back pain and maintain mobility. Contemporary metal-on-polyethylene (MoP) L-TDRs were developed to address wear performance concerns about historical designs, but wear debris generation and periprosthetic tissue reactions for these newer implants have not been determined. QUESTIONS/PURPOSES: The purpose of this study was to determine (1) whether periprosthetic ultrahigh-molecular-weight polyethylene (UHMWPE) wear debris and biological responses were present in tissues from revised contemporary MoP L-TDRs that contain conventional cores fabricated from γ-inert-sterilized UHMWPE; (2) how fixed- versus mobile-bearing design affected UHMWPE wear particle number, shape, and size; and (3) how these wear particle characteristics compare with historical MoP L-TDRs that contain cores fabricated from γ-air-sterilized UHMWPE...
March 2015: Clinical Orthopaedics and related Research
Carlo Rostagno, Ginevra Droandi, Alessandra Rossi, Sergio Bevilacqua, Stefano Romagnoli, Gian Franco Montesi, Pier Luigi Stefàno
OBJECTIVE: Barlow disease is a still challenging pathology for the surgeon. Aim of the present study is to report anatomic abnormalities of mitral valve in patients undergoing mitral valve repair. METHODS: Between January 1st, 2007, and December 31st, 2010, 85 consecutive patients (54 men and 31 women, mean age 59 +/- 14 years--range: 28-85 years) with the features of a Barlow mitral valve disease underwent mitral repair Forty seven percent of patients were in New York Heart Association functional class III or IV...
2014: Italian Journal of Anatomy and Embryology, Archivio Italiano di Anatomia Ed Embriologia
Hyun Jung Koo, Dong Hyun Yang, Sang Young Oh, Joon-Won Kang, Dae-Hee Kim, Jae-Kwan Song, Jae Won Lee, Cheol Hyun Chung, Tae-Hwan Lim
Mitral valve prolapse (MVP), the most frequent cause of severe nonischemic mitral regurgitation, often warrants surgical or interventional valve repair. The severity of mitral regurgitation positively correlates with the development of heart failure and death. Even in patients who are asymptomatic, severe mitral regurgitation causes higher rates of death, heart failure, and atrial fibrillation. Repair procedures for mitral regurgitation have progressed to include leaflet repair, chordal transfer, ring or band annuloplasty, and new percutaneous procedures...
October 2014: Radiographics: a Review Publication of the Radiological Society of North America, Inc
Yadong Liu, Haitao Cui, Xiuli Zhuang, Yen Wei, Xuesi Chen
Blends of aniline pentamer-graft-gelatin (AP-g-GA) and poly(l-lactide) (PLLA) were electrospun to prepare uniform nanofibers as biomimetic scaffolds. The nanofibers exhibited good electroactivity, thermal stability and biodegradability. The biocompatibility of the nanofibers in vitro was evaluated by the adhesion and proliferation of mouse preosteoblastic MC3T3-E1 cells. The cellular elongation was significantly greater on electroactive AP-g-GA/PLLA nanofibers than on PLLA nanofibers. Moreover, the AP-g-GA/PLLA nanofibers stimulated by an electrical pulsed signal could promote the differentiation of MC3T3-E1 cells compared with pure PLLA nanofibers...
December 2014: Acta Biomaterialia
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