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[PMID]:29305450
[Au] Autor:Kono K; Tomita T; Futai K; Yamazaki T; Tanaka S; Yoshikawa H; Sugamoto K
[Ad] Endereço:Graduate School of Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan and Department of Orthopaedic Biomaterial Science, Osaka University Graduate School of Medicine, 2-2 Yamada-oka, Suita, Osaka 565-0871, Japan.
[Ti] Título: three-dimensional kinematics of normal knees during different high-flexion activities.
[So] Source:Bone Joint J;100-B(1):50-55, 2018 Jan.
[Is] ISSN:2049-4408
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:AIMS: In Asia and the Middle-East, people often flex their knees deeply in order to perform activities of daily living. The purpose of this study was to investigate the 3D kinematics of normal knees during high-flexion activities. Our hypothesis was that the femorotibial rotation, varus-valgus angle, translations, and kinematic pathway of normal knees during high-flexion activities, varied according to activity. MATERIALS AND METHODS: We investigated the kinematics of eight normal knees in four male volunteers (mean age 41.8 years; 37 to 53) using 2D and 3D registration technique, and modelled the knees with a computer aided design program. Each subject squatted, kneeled, and sat cross-legged. We evaluated the femoral rotation and varus-valgus angle relative to the tibia and anteroposterior translation of the medial and lateral side, using the transepicodylar axis as our femoral reference relative to the perpendicular projection on to the tibial plateau. This method evaluates the femur medially from what has elsewhere been described as the extension facet centre, and differs from the method classically applied. RESULTS: During squatting and kneeling, the knees displayed femoral external rotation. When sitting cross-legged, femurs displayed internal rotation from 10° to 100°. From 100°, femoral external rotation was observed. No significant difference in varus-valgus angle was seen between squatting and kneeling, whereas a varus position was observed from 140° when sitting cross-legged. The measure kinematic pathway using our methodology found during squatting a medial pivoting pattern from 0° to 40° and bicondylar rollback from 40° to 150°. During kneeling, a medial pivot pattern was evident. When sitting cross-legged, a lateral pivot pattern was seen from 0° to 100°, and a medial pivot pattern beyond 100°. CONCLUSION: The kinematics of normal knees during high flexion are variable according to activity. Nevertheless, our study was limited to a small number of male patients using a different technique to report the kinematics than previous publications. Accordingly, caution should be observed in generalizing our findings. Cite this article: 2018;100-B:50-5.
[Mh] Termos MeSH primário: Fenômenos Biomecânicos/fisiologia
Articulação do Joelho/fisiologia
[Mh] Termos MeSH secundário: Atividades Cotidianas
Adulto
Simulação por Computador
Projeto Auxiliado por Computador
Fluoroscopia
Seres Humanos
Imagem Tridimensional/métodos
Articulação do Joelho/diagnóstico por imagem
Masculino
Meia-Idade
Modelos Anatômicos
Amplitude de Movimento Articular/fisiologia
Rotação
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1801
[Cu] Atualização por classe:180311
[Lr] Data última revisão:
180311
[Sb] Subgrupo de revista:AIM; IM
[Da] Data de entrada para processamento:180107
[St] Status:MEDLINE
[do] DOI:10.1302/0301-620X.100B1.BJJ-2017-0553.R2


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[PMID]:29238193
[Au] Autor:Mahmood SK; Razak IA; Ghaji MS; Yusof LM; Mahmood ZK; Rameli MABP; Zakaria ZAB
[Ad] Endereço:Department of Veterinary Preclinical Science, Faculty of Veterinary Medicine, Universiti Putra Malaysia (UPM), Serdang, Malaysia.
[Ti] Título:In vivo evaluation of a novel nanocomposite porous 3D scaffold in a rabbit model: histological analysis.
[So] Source:Int J Nanomedicine;12:8587-8598, 2017.
[Is] ISSN:1178-2013
[Cp] País de publicação:New Zealand
[La] Idioma:eng
[Ab] Resumo:The healing of load-bearing segmental defects in long bones is a challenge due to the complex nature of the weight that affects the bone part and due to bending, shearing, axial, and torsional forces. An innovative porous 3D scaffolds implant of CaCO aragonite nanocomposite derived from cockle shell was advanced for substitute bone solely for load-bearing cases. The biomechanical characteristics of such materials were designed to withstand cortical bone strength. In promoting bone growth to the implant material, an ideal surface permeability was formed by means of freeze drying and by adding copolymers to the materials. The properties of coating and copolymers supplement were also assessed for bone-implant connection resolutions. To examine the properties of the material in advanced biological system, an experimental trial in an animal model was carried out. Critical sized defect of bone was created in rabbit's radial bone to assess the material for a load-bearing application with a short and extended period assessment with histological evaluation of the incorporated implanted material to the bone of the host. Trials in animal models proved that the material has the capability of enduring load-bearing conditions for long-term use devoid of breaking or generating stress that affects the host bone. Histological examination further confirmed the improved integration of the implanted materials to the host bone with profound bone development into and also above the implanted scaffold, which was attained with negligible reaction of the tissues to a foreign implanted material.
[Mh] Termos MeSH primário: Regeneração Óssea
Substitutos Ósseos
Nanocompostos/química
[Mh] Termos MeSH secundário: Animais
Fenômenos Biomecânicos
Osso e Ossos/fisiologia
Osso e Ossos/cirurgia
Masculino
Teste de Materiais
Porosidade
Coelhos
Tecidos Suporte
Suporte de Carga
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Bone Substitutes)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180309
[Lr] Data última revisão:
180309
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171215
[St] Status:MEDLINE
[do] DOI:10.2147/IJN.S145663


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[PMID]:29214787
[Au] Autor:Eun LY; Lee YM
[Ad] Endereço:Division of Pediatric Cardiology, Department of Pediatrics, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.
[Ti] Título:Myocardial Layer-Specific Strain Analysis in Children with Mitochondrial Disease.
[So] Source:Yonsei Med J;59(1):128-134, 2018 Jan.
[Is] ISSN:1976-2437
[Cp] País de publicação:Korea (South)
[La] Idioma:eng
[Ab] Resumo:PURPOSE: Children with mitochondrial disease (MD) have clinical phenotypes that are more severe than those found in adults. In this study, we assessed cardiac function in children with MD using conventional and advanced echocardiographic measurements, explored any unique patterns present, and investigated the development of early cardiomyopathy (CMP). MATERIALS AND METHODS: We retrospectively reviewed the medical records of 33 children with MD. All patients underwent transthoracic echocardiography with conventional and advanced myocardial analysis. We compared all data between patients and an age-matched healthy control group. RESULTS: Conventional echocardiographic diastolic measurements of mitral E, E/A, and tissue Doppler E' were significantly lower and E/E' was significantly higher in children with MD, compared with the measurements from the control group. There was no significant difference in longitudinal and radial strain between the groups. Circumferential strain in the endocardium (p=0.161), middle myocardium (p=0.008), and epicardium (p=0.042) were lower in patients, compared to the values in controls. Circumferential strain was correlated with E' (p<0.01, r>0.60). CONCLUSION: In children with MD, myocardial circumferential strain may develop early in all three layers, even with normally preserved longitudinal and radial strain. This may be an early diagnostic indicator with which to predict CMP in this patient population.
[Mh] Termos MeSH primário: Doenças Mitocondriais/patologia
Doenças Mitocondriais/fisiopatologia
Miocárdio/patologia
[Mh] Termos MeSH secundário: Fenômenos Biomecânicos
Criança
Ecocardiografia Doppler
Feminino
Seres Humanos
Masculino
Doenças Mitocondriais/diagnóstico por imagem
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180309
[Lr] Data última revisão:
180309
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171208
[St] Status:MEDLINE
[do] DOI:10.3349/ymj.2018.59.1.128


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[PMID]:29199498
[Au] Autor:Strbac V; Pierce DM; Vander Sloten J; Famaey N
[Ad] Endereço:a Biomechanics Section, Department of Mechanical Engineering , KULeuven , Heverlee , Belgium .
[Ti] Título:GPGPU-based explicit finite element computations for applications in biomechanics: the performance of material models, element technologies, and hardware generations.
[So] Source:Comput Methods Biomech Biomed Engin;20(16):1643-1657, 2017 Dec.
[Is] ISSN:1476-8259
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Finite element (FE) simulations are increasingly valuable in assessing and improving the performance of biomedical devices and procedures. Due to high computational demands such simulations may become difficult or even infeasible, especially when considering nearly incompressible and anisotropic material models prevalent in analyses of soft tissues. Implementations of GPGPU-based explicit FEs predominantly cover isotropic materials, e.g. the neo-Hookean model. To elucidate the computational expense of anisotropic materials, we implement the Gasser-Ogden-Holzapfel dispersed, fiber-reinforced model and compare solution times against the neo-Hookean model. Implementations of GPGPU-based explicit FEs conventionally rely on single-point (under) integration. To elucidate the expense of full and selective-reduced integration (more reliable) we implement both and compare corresponding solution times against those generated using underintegration. To better understand the advancement of hardware, we compare results generated using representative Nvidia GPGPUs from three recent generations: Fermi (C2075), Kepler (K20c), and Maxwell (GTX980). We explore scaling by solving the same boundary value problem (an extension-inflation test on a segment of human aorta) with progressively larger FE meshes. Our results demonstrate substantial improvements in simulation speeds relative to two benchmark FE codes (up to 300[Formula: see text] while maintaining accuracy), and thus open many avenues to novel applications in biomechanics and medicine.
[Mh] Termos MeSH primário: Gráficos por Computador
Computadores
Análise de Elementos Finitos
[Mh] Termos MeSH secundário: Túnica Adventícia/fisiologia
Anisotropia
Aorta Abdominal/fisiologia
Fenômenos Biomecânicos
Simulação por Computador
Seres Humanos
Reprodutibilidade dos Testes
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180309
[Lr] Data última revisão:
180309
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171205
[St] Status:MEDLINE
[do] DOI:10.1080/10255842.2017.1404586


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[PMID]:28471354
[Au] Autor:Li D; Jacobsen MM; Gyune Rim N; Backman D; Kaplan DL; Wong JY
[Ad] Endereço:Department of Biomedical Engineering, Boston University, 44 Cummington Mall, Boston, MA 02215, United States of America.
[Ti] Título:Introducing biomimetic shear and ion gradients to microfluidic spinning improves silk fiber strength.
[So] Source:Biofabrication;9(2):025025, 2017 May 31.
[Is] ISSN:1758-5090
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Silkworm silk is an attractive biopolymer for biomedical applications due to its high mechanical strength and biocompatibility; as a result, there is increasing interest in scalable devices to spin silk and recombinant silk so as to improve and customize their properties for diverse biomedical purposes (Vepari and Kaplan 2007 Prog. Polym. Sci. 32 ). While artificial spinning of regenerated silk fibroins adds tunability to properties such as degradation rate and surface functionalization, the resulting fibers do not yet approach the mechanical strength of native silkworm silk. These drawbacks reduce the applicability and attractiveness of artificial silk (Kinahan et al 2011 Biomacromolecules 12 ). Here, we used computational fluid dynamic simulations to incorporate shear in tandem with biomimetic ion gradients by coupling a modular novel glass microfluidic device to our previous co-axial flow device. Fibers spun with this combined apparatus demonstrated a significant increase in mechanical strength compared to fibers spun with the basic apparatus alone, with a three-fold increase in Young's modulus and extensibility and a twelve-fold increase in toughness. These results thus demonstrate the critical importance of ionic milieu and shear stress in spinning strong fibers from solubilized silk fibroin.
[Mh] Termos MeSH primário: Biomimética/métodos
Microfluídica/métodos
Seda/química
Resistência à Tração
[Mh] Termos MeSH secundário: Animais
Fenômenos Biomecânicos
Biomimética/instrumentação
Simulação por Computador
Hidrodinâmica
Íons
Metais/química
Microfluídica/instrumentação
Espectroscopia de Infravermelho com Transformada de Fourier
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Ions); 0 (Metals); 0 (Silk)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180309
[Lr] Data última revisão:
180309
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170505
[St] Status:MEDLINE
[do] DOI:10.1088/1758-5090/aa711b


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[PMID]:28462906
[Au] Autor:Zhang T; Zhang H; Zhang L; Jia S; Liu J; Xiong Z; Sun W
[Ad] Endereço:Biomanufacturing Center, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, People's Republic of China. Biomanufacturing and Rapid Forming Technology Key Laboratory of Beijing, Beijing 100084, People's Republic of China. 'Biomanufacturing and Engineering Living Systems' Innovation International Talents Base (111 Base), Beijing, 100084, People's Republic of China.
[Ti] Título:Biomimetic design and fabrication of multilayered osteochondral scaffolds by low-temperature deposition manufacturing and thermal-induced phase-separation techniques.
[So] Source:Biofabrication;9(2):025021, 2017 May 23.
[Is] ISSN:1758-5090
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Integrative osteochondral repair is a useful strategy for cartilage-defect repair. To mimic the microenvironment, it is necessary that scaffolds effectively mimic the extracellular matrix of natural cartilage and subchondral bone. In this study, biomimetic osteochondral scaffolds containing an oriented cartilage layer, a compact layer, and a three-dimensional (3D)-printed core-sheath structured-bone layer were developed. The oriented cartilage layer was designed to mimic the structural and material characteristics of native cartilage tissue and was fabricated with cartilage matrix-chitosan materials, using thermal-induced phase-separation technology. The 3D-printed core-sheath structured-bone layer was fabricated with poly(L-lactide-co-glycolide)/ß-tricalcium phosphate-collagen materials by low-temperature deposition technology, using a specially designed core-sheath nozzle, and was designed to mimic the mechanical characteristics of subchondral bone and improve scaffold hydrophilicity. The compact layer was designed to mimic the calcified-layer structure of natural cartilage to ensure the presence of different suitable microenvironments for the regeneration of bone and cartilage. A dissolving-bonding process was developed to effectively combine the three parts together, after which the bone and cartilage scaffolds exhibited good mechanical properties and hydrophilicity. Additionally, goat autologous bone mesenchymal stem cells (BMSCs) were isolated and then seeded into the bone and cartilage layers, respectively, and following a 1 week culture in vitro, the BMSC-scaffold constructs were implanted into a goat articular-defect model. Our results indicated that the scaffolds exhibited good biocompatibility, and 24 weeks after implantation, the femoral condyle surface was relatively flat and consisted of a large quantity of hyaloid cartilage. Furthermore, histological staining revealed regenerated trabecular bone formed in the subchondral bone-defect area. These results provided a new method to fabricate biomimetic osteochondral scaffolds and demonstrated their effectiveness for future clinical applications in cartilage-defect repair.
[Mh] Termos MeSH primário: Biomimética/métodos
Osso e Ossos/citologia
Cartilagem Articular/citologia
Células Mesenquimais Estromais/citologia
Temperatura Ambiente
Tecidos Suporte/química
[Mh] Termos MeSH secundário: Animais
Fenômenos Biomecânicos
Cartilagem Articular/fisiologia
Cartilagem Articular/ultraestrutura
Forma Celular
Módulo de Elasticidade
Cabras
Interações Hidrofóbicas e Hidrofílicas
Regeneração
Cicatrização
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180309
[Lr] Data última revisão:
180309
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170503
[St] Status:MEDLINE
[do] DOI:10.1088/1758-5090/aa7078


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[PMID]:27771811
[Au] Autor:Kamenskiy A; Seas A; Deegan P; Poulson W; Anttila E; Sim S; Desyatova A; MacTaggart J
[Ad] Endereço:Department of Surgery, 987690 Nebraska Medical Center, University of Nebraska Medical Center, Omaha, NE, 68198-7690, USA. Alexey.Kamenskiy@unmc.edu.
[Ti] Título:Constitutive description of human femoropopliteal artery aging.
[So] Source:Biomech Model Mechanobiol;16(2):681-692, 2017 04.
[Is] ISSN:1617-7940
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:Femoropopliteal artery (FPA) mechanics play a paramount role in pathophysiology and the artery's response to therapeutic interventions, but data on FPA mechanical properties are scarce. Our goal was to characterize human FPAs over a wide population to derive a constitutive description of FPA aging to be used for computational modeling. Fresh human FPA specimens ([Formula: see text]) were obtained from [Formula: see text] predominantly male (80 %) donors 54±15 years old (range 13-82 years). Morphometric characteristics including radius, wall thickness, opening angle, and longitudinal pre-stretch were recorded. Arteries were subjected to multi-ratio planar biaxial extension to determine constitutive parameters for an invariant-based model accounting for the passive contributions of ground substance, elastin, collagen, and smooth muscle. Nonparametric bootstrapping was used to determine unique sets of material parameters that were used to derive age-group-specific characteristics. Physiologic stress-stretch state was calculated to capture changes with aging. Morphometric and constitutive parameters were derived for seven age groups. Vessel radius, wall thickness, and circumferential opening angle increased with aging, while longitudinal pre-stretch decreased ([Formula: see text]). Age-group-specific constitutive parameters portrayed orthotropic FPA stiffening, especially in the longitudinal direction. Structural changes in artery wall elastin were associated with reduction of physiologic longitudinal and circumferential stretches and stresses with age. These data and the constitutive description of FPA aging shed new light on our understanding of peripheral arterial disease pathophysiology and arterial aging. Application of this knowledge might improve patient selection for specific treatment modalities in personalized, precision medicine algorithms and could assist in device development for treatment of peripheral artery disease.
[Mh] Termos MeSH primário: Envelhecimento
Artérias/fisiologia
Modelos Biológicos
[Mh] Termos MeSH secundário: Adolescente
Adulto
Idoso
Idoso de 80 Anos ou mais
Fenômenos Biomecânicos
Colágeno/metabolismo
Elastina/metabolismo
Feminino
Seres Humanos
Masculino
Meia-Idade
Doença Arterial Periférica/fisiopatologia
Adulto Jovem
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, N.I.H., EXTRAMURAL; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
9007-34-5 (Collagen); 9007-58-3 (Elastin)
[Em] Mês de entrada:1712
[Cu] Atualização por classe:180308
[Lr] Data última revisão:
180308
[Sb] Subgrupo de revista:IM; S
[Da] Data de entrada para processamento:161025
[St] Status:MEDLINE
[do] DOI:10.1007/s10237-016-0845-7


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[PMID]:28749741
[Au] Autor:Edgar CM; Singh H; Obopilwe E; Voss A; Divenere J; Tassavor M; Comer B; Sanchez G; Mazzocca AD; Provencher MT
[Ad] Endereço:Department of Orthopaedic Surgery, New England Musculoskeletal Institute, University of Connecticut School of Medicine, Farmington, Connecticut, USA.
[Ti] Título:Pectoralis Major Repair: A Biomechanical Analysis of Modern Repair Configurations Versus Traditional Repair Configuration.
[So] Source:Am J Sports Med;45(12):2858-2863, 2017 Oct.
[Is] ISSN:1552-3365
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:BACKGROUND: Pectoralis major (PM) ruptures are increasingly common, and a variety of surgical techniques have been described. However, tested techniques have demonstrated diminished strength with inadequate restoration of the footprint and suture failure at relatively low loads. Purpose/Hypothesis: The purpose was to biomechanically compare PM transosseous suture repair (current gold standard) to modern PM repair techniques that use larger caliber sutures, suture tape, and unicortical button fixation (UBF). The null hypothesis was that there would be no mechanical difference between repair techniques and no difference in the amount of footprint restoration. STUDY DESIGN: Controlled laboratory study. METHODS: Twenty-four fresh-frozen cadaveric shoulders controlled for age and bone mineral density were randomized equally to 4 groups: (1) UBF, suture tape; (2) UBF, No. 5 suture, suture tape; (3) bone trough with No. 2 suture; and (4) native PM tendon group; all groups were tested to failure. The specimens were tested under cycling loads (10 N to 125 N) with a final load-to-failure test at 1 mm/s. Failure modes were classified by location and cause of rupture based on optical markers, while tendon footprint length was measured to determine amount of footprint restoration. RESULTS: For fixation strength, the mean peak load was significantly greater in the native tendon (1816 ± 706 N) versus UBF/No. 5 suture/suture tape (794 ± 168 N), UBF/suture tape (502 ± 201 N), and bone trough (492 ± 151 N) ( P < .001 for all). UBF/No. 5 suture/suture tape featured the lowest displacement superiorly (1.09 ± 0.47 mm) and inferiorly (1.14 ± 0.39 mm) with a significant difference compared with bone trough. With regard to tendon footprint reapproximation, cortical button fixation best approximated native tendon footprint length versus bone trough. CONCLUSION: Based on peak failure load, the UBF/No. 5 suture/suture tape construct demonstrated 61% greater construct strength than a traditional bone trough technique. Moreover, displacement after cyclic loading was by far smallest in the UBF/No. 5 suture/suture tape construct. Therefore, repair constructs with larger caliber suture and suture tape provide a measurable improvement in construct strength versus traditional PM repair techniques in a biomechanical model and may be advantageous for repair. CLINICAL RELEVANCE: Cortical button fixation with larger caliber suture and suture tape allows for a significantly better PM repair than more traditional techniques at the time of surgery, which may ultimately result in improved clinical outcomes if implemented in surgical practice.
[Mh] Termos MeSH primário: Procedimentos Ortopédicos/métodos
Músculos Peitorais/fisiologia
Músculos Peitorais/cirurgia
Ruptura/cirurgia
[Mh] Termos MeSH secundário: Idoso
Fenômenos Biomecânicos
Cadáver
Feminino
Seres Humanos
Masculino
Meia-Idade
Músculos Peitorais/lesões
Ruptura/fisiopatologia
Âncoras de Sutura
Técnicas de Sutura
Resistência à Tração
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180306
[Lr] Data última revisão:
180306
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170728
[St] Status:MEDLINE
[do] DOI:10.1177/0363546517716175


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[PMID]:28749699
[Au] Autor:Herrington L; Alarifi S; Jones R
[Ad] Endereço:Centre for Health, Sport and Rehabilitation Sciences, University of Salford, Salford, UK.
[Ti] Título:Patellofemoral Joint Loads During Running at the Time of Return to Sport in Elite Athletes With ACL Reconstruction.
[So] Source:Am J Sports Med;45(12):2812-2816, 2017 Oct.
[Is] ISSN:1552-3365
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:BACKGROUND: Patellofemoral joint pain and degeneration are common in patients who undergo anterior cruciate ligament reconstruction (ACLR). The presence of patellofemoral joint pain significantly affects the patient's ability to continue sport participation and may even affect participation in activities of daily living. The mechanisms behind patellofemoral joint pain and degeneration are unclear, but previous research has identified altered patellofemoral joint loading in individuals with patellofemoral joint pain when running. It is unclear whether this process occurs after ACLR. PURPOSE: To assess the patellofemoral joint stresses during running in ACLR knees and compare the findings to the noninjured knee and matched control knees. STUDY DESIGN: Controlled laboratory study. METHODS: Thirty-four elite sports practitioners who had undergone ACLR and 34 age- and sex-matched controls participated in the study. The participants' running gait was assessed via 3D motion capture, and knee loads and forces were calculated by use of inverse dynamics. RESULTS: A significance difference was found in knee extensor moment, knee flexion angles, patellofemoral contact force (about 23% greater), and patellofemoral contact pressure (about 27% greater) between the ACLR and the noninjured limb ( P ≤ .04) and between the ACLR and the control limb ( P ≤ .04); no significant differences were found between the noninjured and control limbs ( P ≥ .44). CONCLUSION: Significantly greater levels of patellofemoral joint stress and load were found in the ACLR knee compared with the noninjured and control knees. CLINICAL RELEVANCE: Altered levels of patellofemoral stress in the ACLR knee during running may predispose individuals to patellofemoral joint pain.
[Mh] Termos MeSH primário: Lesões do Ligamento Cruzado Anterior/fisiopatologia
Lesões do Ligamento Cruzado Anterior/cirurgia
Reconstrução do Ligamento Cruzado Anterior
Artralgia/fisiopatologia
Articulação Patelofemoral/fisiopatologia
Volta ao Esporte
[Mh] Termos MeSH secundário: Atividades Cotidianas
Adulto
Fenômenos Biomecânicos
Feminino
Marcha/fisiologia
Seres Humanos
Masculino
Articulação Patelofemoral/fisiologia
Corrida/fisiologia
Adulto Jovem
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180306
[Lr] Data última revisão:
180306
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170728
[St] Status:MEDLINE
[do] DOI:10.1177/0363546517716632


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[PMID]:29334923
[Au] Autor:Park K; Shin J; Lee J
[Ad] Endereço:Department of Ophthalmology, Pusan National University School of Medicine, #179 Gudeok-ro, Seo-gu, Busan, 602-739, South Korea.
[Ti] Título:Relationship between corneal biomechanical properties and structural biomarkers in patients with normal-tension glaucoma: a retrospective study.
[So] Source:BMC Ophthalmol;18(1):7, 2018 Jan 15.
[Is] ISSN:1471-2415
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:BACKGROUND: We evaluated the relationships between corneal biomechanical properties and structural parameters in patients with newly diagnosed, untreated normal-tension glaucoma (NTG). METHODS: All subjects were evaluated using an Ocular Response Analyzer (ORA) measuring corneal hysteresis (CH) and the corneal resistance factor (CRF). Central corneal thickness (CCT), Goldmann applanation tonometric (GAT) data, axial length, and the spherical equivalent (SE), were also measured. Confocal scanning laser ophthalmoscopy was performed with the aid of a Heidelberg retina tomograph (HRT III). We sought correlations between HRT parameters and different variables including CCT, CH, and the CRF. Multiple linear regression analysis was performed to identify significant associations between corneal biomechanical properties and optic nerve head parameters. RESULTS: We enrolled 95 eyes of 95 NTG patients and 93 eyes of 93 normal subjects. CH and the CRF were significantly lower in more advanced glaucomatous eyes (P = 0.001, P = 0.008, respectively). The rim area, rim volume, linear cup-to-disc ratio (LCDR), and mean retinal nerve fiber layer (RNFL) thickness were significantly worse in more advanced glaucomatous eyes (P < 0.001, P < 0.001, P < 0.001, and P = 0.001). CH was directly associated with rim area, rim volume, and mean RNFL thickness (P = 0.012, P = 0.028, and P = 0.043) and inversely associated with LCDR (P = 0.015), after adjusting for age, axial length, CCT, disc area, GAT data, and SE. However, in normal subjects, there were no significant associations between corneal biomechanical properties and HRT parameters. CONCLUSIONS: A lower CH is significantly associated with a smaller rim area and volume, a thinner RNFL, and a larger LCDR, independent of disc size, corneal thickness, intraocular pressure, and age.
[Mh] Termos MeSH primário: Córnea/fisiopatologia
Pressão Intraocular/fisiologia
Glaucoma de Baixa Tensão/fisiopatologia
Oftalmoscopia/métodos
[Mh] Termos MeSH secundário: Fenômenos Biomecânicos
Córnea/patologia
Estudos Transversais
Feminino
Seguimentos
Seres Humanos
Glaucoma de Baixa Tensão/diagnóstico
Masculino
Meia-Idade
Estudos Retrospectivos
Tonometria Ocular
[Pt] Tipo de publicação:COMPARATIVE STUDY; JOURNAL ARTICLE
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180305
[Lr] Data última revisão:
180305
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180117
[St] Status:MEDLINE
[do] DOI:10.1186/s12886-018-0673-x



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