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1.
J Public Health (Oxf) ; 39(4): 821-827, 2017 12 01.
Artículo en Inglés | MEDLINE | ID: mdl-28633509

RESUMEN

Background: The majority of tuberculosis (TB) cases in the UK occur among people born in high-burden countries (73%), and are concentrated in large urban centres. This study explores migrants' attitudes and beliefs towards TB in an English District where the incidence is higher than the UK average. Methods: Community engagement workers ran 26 focus groups using a standardized questionnaire. Purposeful sampling was used to obtain a cross-section of migrant communities. The summary reports were analysed using thematic analysis. Results: Most groups did not see TB as a current issue in their community and associated it either with the past or with their country of birth. It appeared to be rarely discussed in their communities and generally not noted as being associated with stigma. Conclusions: This study revealed a change in social attitudes to TB in migrant groups to those reported in previous literature. Stigma had considerably less effect than expected. However, the evidence revealed that these high-risk groups made the erroneous assumption that, by moving to a low incidence country, they were no longer at risk of the disease. TB services need to respond by revising the information that they provide to take into account the risk perception of these populations.


Asunto(s)
Conocimientos, Actitudes y Práctica en Salud , Migrantes/psicología , Tuberculosis/psicología , Inglaterra/epidemiología , Grupos Focales , Conductas Relacionadas con la Salud , Humanos , Masculino , Investigación Cualitativa , Factores de Riesgo , Tuberculosis/epidemiología , Población Urbana
2.
J Public Health (Oxf) ; 38(2): 391-5, 2016 06.
Artículo en Inglés | MEDLINE | ID: mdl-25889386

RESUMEN

Despite well-established treatment regimens, tuberculosis (TB) remains a public health burden; it disproportionately affects poor and marginalized populations who may not have access to social support, including migrants, homeless people and those dependent on drugs or alcohol. There is a clearly demonstrated need for housing and other appropriate social support, as part of a package of integrated clinical and social care. However, TB prevention and control efforts in the UK often do not address the specific vulnerabilities of these groups and it can be a challenge to support the continued TB treatment of these underserved populations. This challenge is exacerbated by complex issues concerning funding, immigration and the law. In this paper, we have reviewed current UK guidance and legislation, discussed several case studies and highlighted examples of existing models of community support for TB patients. Finally, we lay out our recommendations for ensuring a co-ordinated, whole system approach to successful TB treatment.


Asunto(s)
Emigración e Inmigración , Personas con Mala Vivienda , Tuberculosis , Poblaciones Vulnerables , Adulto , Antituberculosos/economía , Antituberculosos/uso terapéutico , Farmacorresistencia Bacteriana Múltiple , Femenino , Vivienda , Humanos , Masculino , Persona de Mediana Edad , Salud Pública , Apoyo Social , Medicina Estatal/legislación & jurisprudencia , Tuberculosis/tratamiento farmacológico , Tuberculosis/economía , Tuberculosis/prevención & control , Tuberculosis/transmisión , Reino Unido
3.
Euro Surveill ; 17(38)2012 Sep 20.
Artículo en Inglés | MEDLINE | ID: mdl-23040967

RESUMEN

Tuberculosis (TB) patients who do not complete treatment pose a potential public health risk. In West Yorkshire, local clinicians suspected that this risk was overestimated by the national Enhanced Tuberculosis Surveillance system. We audited patients who failed to complete treatment and were categorised as lost-to-follow-up (LTFU) between 2004 and 2008, using a combination of hand searching existing records and obtaining additional information from clinicians. In the study period 2,031 TB cases with reported outcome were notified in West Yorkshire, 23% (n=474) did not complete treatment, and 199 (42%) of those were categorised as LTFU 12 months after notification. Of these 199, 49% (n=98) remained LTFU after the audit, 51% (n=101) were re-classified to the following categories: 24% (n=47) transferred abroad, 16% (n=31) recommenced and completed treatment, 6% (n=13) transferred to another clinic in the United Kingdom (UK), and 5% (n=10) died. These patients therefore no-longer posed a public health risk. Further training for clinicians to improve accuracy of outcome reporting has been initiated. Nationally, the collection of treatment outcome data needs to be strengthened and extending the follow-up for treatment outcome monitoring should be considered.


Asunto(s)
Notificación de Enfermedades/normas , Perdida de Seguimiento , Evaluación de Resultado en la Atención de Salud/estadística & datos numéricos , Tuberculosis Pulmonar/terapia , Adulto , Auditoría Clínica , Bases de Datos Factuales , Notificación de Enfermedades/estadística & datos numéricos , Inglaterra/epidemiología , Femenino , Estudios de Seguimiento , Humanos , Almacenamiento y Recuperación de la Información/normas , Masculino , Persona de Mediana Edad , Evaluación de Resultado en la Atención de Salud/tendencias , Cooperación del Paciente/etnología , Cooperación del Paciente/estadística & datos numéricos , Transferencia de Pacientes/estadística & datos numéricos , Vigilancia de la Población , Factores de Riesgo , Factores de Tiempo , Resultado del Tratamiento , Negativa del Paciente al Tratamiento , Tuberculosis Pulmonar/etnología , Tuberculosis Pulmonar/mortalidad
4.
Pregnancy Hypertens ; 2(3): 194, 2012 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-26105247

RESUMEN

INTRODUCTION: Nigeria has one of the highest rates of maternal mortality in the world. Eclampsia is a major contributor to the deaths especially in Northern Nigeria where the culture of teenage marriage is common. Kano is the state with the highest population in Nigeria. Despite its effectiveness, magnesium sulphate was been used to treat eclampsia and severe preclampsia in only one of 35 general hospitals inthe state as at 2007. OBJECTIVES: In 2008, magnesium sulphate was introduced in 10 General Hospitals in Kano state of Northern Nigeria in a Population Council project funded by the MacArthur Foundation. The aim of the study was to determine if the maternal outcomes improved. METHODS: Doctors and midwives from the 10 hospitals were trained on the use of magnesium sulphate. The trained health workers later conducted step down trainings at their health facilities. Magnesium sulphate, treatment protocol, patella hammer and calcium gluconate were then supplied to the hospitals. Data was collected through structured data forms. The data was analysed using SPSS. RESULTS: Within a year of the project, 1045 patients with severe preeclampsia and eclampsia were treated. The case fatality rate for severe preeclampsia and eclampsia fell from 20.9% (95% CI 18.7-23.2) recorded before the project to 2.3% (95%CI 1.5-3.5) after the project. The perinatal mortality rate in those that received magnesium sulphate was 12.3% (CI 10.4-14.5) while the 5min APGAR score for 72.9% of the babies was 7 or more. CONCLUSION: Training of health workers on updated evidence based interventions and providing an enabling environment for their practice are key components to the attainment of the Millennium Development Goals in developing countries.

5.
Artículo en Inglés | AIM (África) | ID: biblio-1273944

RESUMEN

Pathogenic microorganisms resistant to commonly used antibiotics are of worldwide concern. Methicillin-resistant Staphylococcus aureus (MRSA) has been reported worldwide and causes both hospital and community-associated infections in humans. Sixty-five (65) Staphylococcus aureus isolates from clinical samples were screened for methicillin resistance in order to evaluate the prevalence of methicillin-resistant strains at Ebonyi State University Teaching Hospital; Abakaliki and to determine the antimicrobial susceptibility profile of MRSA strains. Susceptibility testing of the isolates to oxacillin and to some other conventional antimicrobial sensitivity discs commonly used in the study area was done using Kirby-Bauer disc diffusion technique. Of the 65 Staphylococcus aureus isolates screened; 15 (23) were susceptible to methicillin while 50 (77) were resistant to methicillin. The Methicillin-resistant isolates showed 100resistance to ciprofloxacin; ceftriaxone; nitrofurantoin and erythromycin. The percentage resistance recorded for other antibiotics were ofloxacin (88); ampicillin (76); gentamicin (72); while the lowest resistance; (40) was recorded for vancomycin. It was noted that vancomycin is still the antibiotic of choice for the treatment of MRSA infections. It was concluded that the prevalence of MRSA is high in the study area; and this should necessitate caution in the prescription of antibiotics without proper indication


Asunto(s)
Staphylococcus aureus Resistente a Meticilina , Pruebas de Sensibilidad Microbiana , Staphylococcus aureus , Vancomicina
7.
Euro Surveill ; 16(12)2011 Mar 24.
Artículo en Inglés | MEDLINE | ID: mdl-21457684

RESUMEN

The contribution of travel to high incidence countries and the impact of the discontinuation of universal Bacillus Calmette­Guérin (BCG) vaccination to there cent rise in tuberculosis (TB) in the United Kingdom remain unclear. An outbreak in a college presented an opportunity to assess these. A cohort of students answered a questionnaire assessing risk factors for TB.Participants were screened with an interferon gamma release assay (IGRA). Unadjusted and adjusted odds ratios (OR) were calculated using logistic regression.Among 2,284 students, 400 (17.5%) were diagnosed with TB infection. A higher risk was noted for travel to a high incidence area in the past two years (OR: 1.39;95% confidence interval (CI): 1.04­1.89) and among those with the greatest exposure to the index case(OR: 3.94; 95% CI: 2.60­5.97). There was no association between BCG and risk of infection (OR: 1.05; 95%CI: 0.80­1.39). The lack of a protective effect by BCG on TB infection supports the discontinuation of universal vaccination. The association with foreign travel suggests the need to assess the cost-effectiveness of serial IGRA testing and treatment of positive persons among returning travellers.


Asunto(s)
Vacuna BCG/uso terapéutico , Brotes de Enfermedades/prevención & control , Brotes de Enfermedades/estadística & datos numéricos , Medición de Riesgo/métodos , Viaje/estadística & datos numéricos , Tuberculosis/epidemiología , Tuberculosis/prevención & control , Adolescente , Adulto , Anciano , Anciano de 80 o más Años , Niño , Preescolar , Femenino , Humanos , Incidencia , Lactante , Recién Nacido , Masculino , Persona de Mediana Edad , Factores de Riesgo , Reino Unido/epidemiología , Adulto Joven
8.
J Orthop Res ; 23(4): 743-9, 2005 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-16022985

RESUMEN

Common image-based diagnostic techniques used to detect ankle ligament injuries or the effects of those injuries (e.g., mechanical instability) include magnetic resonance imaging (MRI) and stress radiography. Each of these techniques has limitations. The interpretation of the results obtained through stress radiography, a two-dimensional technique, is highly controversial. MRI can facilitate visualization of soft tissue, but three-dimensional visualization of the full length of the ligaments or detecting partial ligament damage is difficult. This work is part of a long-term study aimed at improving the diagnostic ability of MRI by utilizing it not only to visualize the ligaments but also to detect the mechanical instability produced at the ankle and subtalar joints due to ligament damage. The goal of the present study was to evaluate the ability of a previously developed technique called 3D stress MRI (sMRI) to detect in vitro the effect of damage to the lateral collateral ligaments and the stabilizing effect produced by two common surgical reconstruction techniques. MRI data were collected from eight cadaver limbs in a MR compatible ankle-loading device in neutral, inversion, and anterior drawer. Each specimen was tested intact, after cutting the anterior talo-fibular ligament followed by the calcaneo-fibular ligament and after applying two reconstructions. Ligament injuries produced significant changes in the response of the ankle and subtalar joints to load as detected by the 3D stress MRI technique. Both surgical procedures restored mechanical stability to the joints but they differed in the amount and type of stabilization achieved. We concluded that 3D sMRI can extend the diagnostic power of MRI from the current practice of slice-by-slice visualization to the assessment of mechanical function, the compromise in this function due to injury, and the effects of surgery.


Asunto(s)
Traumatismos del Tobillo/patología , Traumatismos del Tobillo/cirugía , Ligamentos Laterales del Tobillo/patología , Ligamentos Laterales del Tobillo/cirugía , Imagen por Resonancia Magnética/métodos , Procedimientos de Cirugía Plástica , Anciano , Anciano de 80 o más Años , Traumatismos del Tobillo/fisiopatología , Articulación del Tobillo/patología , Articulación del Tobillo/fisiopatología , Articulación del Tobillo/cirugía , Cadáver , Humanos , Imagenología Tridimensional , Técnicas In Vitro , Ligamentos Laterales del Tobillo/fisiopatología , Estrés Mecánico , Soporte de Peso
9.
J Biomech ; 38(3): 567-78, 2005 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-15652556

RESUMEN

A technique to study the three-dimensional (3D) mechanical characteristics of the ankle and of the subtalar joints in vivo and in vitro is described. The technique uses an MR scanner compatible 3D positioning and loading linkage to load the hindfoot with precise loads while the foot is being scanned. 3D image processing algorithms are used to derive from the acquired MR images bone morphology, hindfoot architecture, and joint kinematics. The technique was employed to study these properties both in vitro and in vivo. The ankle and subtler joint motion and the changes in architecture produced in response to an inversion load and an anterior drawer load were evaluated. The technique was shown to provide reliable measures of bone morphology. The left-to-right variations in bone morphology were less than 5%. The left-to-right variations in unloaded hindfoot architecture parameters were less than 10%, and these properties were only slightly affected by inversion and anterior drawer loads. Inversion and anterior drawer loads produced motion both at the ankle and at the subtalar joint. In addition, high degree of coupling, primarily of internal rotation with inversion, was observed both at the ankle and at the subtalar joint. The in vitro motion produced in response to inversion and anterior drawer load was greater than the in vivo motion. Finally, external motion, measured directly across the ankle complex, produced in response to load was much greater than the bone movements measured through the 3D stress MRI technique indicating the significant effect of soft tissue and skin interference.


Asunto(s)
Articulación del Tobillo/fisiología , Imagen por Resonancia Magnética/métodos , Estrés Mecánico , Articulación Talocalcánea/fisiología , Adulto , Articulación del Tobillo/anatomía & histología , Fenómenos Biomecánicos , Femenino , Humanos , Imagenología Tridimensional , Masculino , Métodos , Persona de Mediana Edad , Articulación Talocalcánea/anatomía & histología
11.
Clin Orthop Relat Res ; (385): 16-22, 2001 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-11302308

RESUMEN

Many opportunities exist and more will become available for expanding the role of orthopaedic surgeons in the treatment of patients with foot and ankle conditions in the United States. The current authors present the main areas of opportunity: giving comprehensive foot care to patients who already are treated by orthopaedic surgeons and the application of advanced scientific biotechnology that will improve outcomes for patients with foot and ankle conditions who currently do not have satisfactory treatment. Orthopaedic surgeons must maintain a high level of commitment in their education and professional availability to patients and primary care physicians to expand their participation in foot and ankle care. Networking with physician and nonphysician primary care providers and volunteering educational services for fellow professionals in the evaluation and treatment of the entire spectrum of foot and ankle conditions is necessary. The general orthopaedist and the orthopaedic foot and ankle specialist can share in the future of treatment of patients with foot and ankle conditions in the United States.


Asunto(s)
Enfermedades del Pie/terapia , Ortopedia , Tobillo , Traumatismos del Tobillo/cirugía , Enfermedades Óseas/cirugía , Enfermedades Óseas/terapia , Enfermedades del Pie/cirugía , Fracturas Óseas/cirugía , Humanos
12.
Phys Ther ; 80(8): 769-80, 2000 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-10911415

RESUMEN

BACKGROUND AND PURPOSE: The goal of this investigation was to study the recovery of ankle plantar-flexor peak torque, fatigue resistance, and functional ability (stair climbing, walking) following cast immobilization in patients with ankle fractures. SUBJECTS: The participants were 10 patients who underwent open reduction-internal fixation and 8 weeks of cast immobilization following a fracture of the ankle mortise and 10 age- and sex-matched, noninjured comparison subjects. METHODS: Plantar-flexor torque and fatigue resistance were measured at 1, 5, and 10 weeks of rehabilitation using an isokinetic dynamometer. Ankle plantar-flexor peak torque and fatigue resistance were correlated to timed ambulation, timed stair climbing, and unilateral heel-rises. RESULTS: Following immobilization, plantar-flexor peak torque was decreased at all angular speeds and positions. The decrease in peak torque was associated with an increase in fatigue resistance. With rehabilitation, ankle plantar-flexor torque and fatigue resistance normalized. Regression analysis revealed a strong relationship between plantar-flexor peak torque and functional measures. By 10 weeks post-immobilization, peak torque, fatigue resistance, and all measures of functional performance had returned to control levels. CONCLUSION AND DISCUSSION: The decrease in muscle performance, functional ability, and fatigue resistance induced by 8 weeks of cast immobilization can be reversed with 10 weeks of supervised physical therapy. In addition, this study demonstrated that ankle-plantar flexor torque is a good predictor of stair-climbing and walking performance in patients with ankle fractures.


Asunto(s)
Traumatismos del Tobillo/rehabilitación , Fracturas Óseas/rehabilitación , Marcha/fisiología , Inmovilización/efectos adversos , Fatiga Muscular/fisiología , Modalidades de Fisioterapia/métodos , Adulto , Traumatismos del Tobillo/cirugía , Fenómenos Biomecánicos , Moldes Quirúrgicos/efectos adversos , Femenino , Fijación Interna de Fracturas/métodos , Fracturas Óseas/cirugía , Humanos , Contracción Isométrica , Masculino , Dimensión del Dolor , Rango del Movimiento Articular , Valores de Referencia , Análisis de Regresión
13.
Foot Ankle Int ; 20(7): 404-7, 1999 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-10437921

RESUMEN

This study evaluates the long-term results of displaced bi- and trimalleolar fractures treated closed. Few reports exist in the literature regarding the long-term outcomes of ankle fractures, and none of these specifically addresses displaced bi- and trimalleolar fractures treated nonoperatively. This study analyzed the results of bi- and trimalleolar fractures treated by a single surgeon from 1973 to 1981. As was the standard of care at that time, these fractures were treated nonoperatively if a stable reduction was achieved and maintained. Serial radiographs confirmed the maintenance of reduction in a non-weightbearing long leg cast for 6 weeks and then a short leg walking cast for 6 weeks. Of the 34 patients in this series, 19 were available for review, 10 were deceased, and five were lost to follow-up. The average age at the time of injury was 39 years (range, 17-79 years), and the average length of follow-up was 20 years (range, 16-24 years). At the time of review, only two patients with trimalleolar fractures were minimally symptomatic or had radiographic evidence of mild degenerative changes. The average American Orthopaedic Foot and Ankle Score was 98 of 100 points (range, 87-100 points). This long-term follow-up shows that bi- and trimalleolar fractures can be treated nonoperatively if an anatomic reduction is maintained and closely followed. With reports indicating as much as a 5% deep infection rate and a 10% incidence of loss of reduction after internal fixation, universally recommending an operation for these injuries should be reconsidered, especially in high surgical risk patients.


Asunto(s)
Traumatismos del Tobillo/terapia , Moldes Quirúrgicos , Fracturas Óseas/terapia , Inmovilización , Luxaciones Articulares/terapia , Adolescente , Adulto , Anciano , Anciano de 80 o más Años , Traumatismos del Tobillo/complicaciones , Femenino , Estudios de Seguimiento , Fracturas Óseas/complicaciones , Humanos , Luxaciones Articulares/complicaciones , Masculino , Persona de Mediana Edad , Resultado del Tratamiento
15.
Foot Ankle Int ; 19(7): 472-4, 1998 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-9694126

RESUMEN

A complete atraumatic rupture of the flexor hallucis longus tendon in a patient without systemic disease is a rare occurrence. Although four cases of complete traumatic ruptures have been cited in the literature, only one case of a complete atraumatic rupture has been previously reported. Presented here is a second case with a review of the literature and a discussion of the surgical indications.


Asunto(s)
Enfermedades Musculares , Adulto , Enfermedad Crónica , Pie , Humanos , Masculino , Enfermedades Musculares/patología , Enfermedades Musculares/cirugía , Rotura Espontánea , Tendones/cirugía
16.
Muscle Nerve ; 21(8): 1006-12, 1998 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-9655118

RESUMEN

This study describes the metabolic, morphologic, neurologic, and functional adaptations observed in the plantar flexors during 8 weeks of lower leg immobilization and 10 weeks of physical therapy following ankle surgery. A combination of magnetic resonance imaging and spectroscopy, isokinetic and isometric muscle testing, and simple functional tests revealed many adaptive changes due to immobilization, including atrophy, loss of muscle strength, reduced central activation, increase in fatigue resistance, and an increase in inorganic phosphate content. After 10 weeks of physical therapy all alterations were reversed, with the exception of a remaining 5.5% deficit in total muscle cross-sectional area.


Asunto(s)
Traumatismos del Tobillo/rehabilitación , Reposo en Cama , Fracturas Óseas/rehabilitación , Músculo Esquelético/fisiología , Adulto , Traumatismos del Tobillo/diagnóstico , Traumatismos del Tobillo/fisiopatología , Atrofia , Moldes Quirúrgicos , Fracturas Óseas/diagnóstico , Fracturas Óseas/fisiopatología , Humanos , Contracción Isométrica/fisiología , Contracción Isotónica/fisiología , Estudios Longitudinales , Imagen por Resonancia Magnética , Espectroscopía de Resonancia Magnética , Masculino , Actividad Motora/fisiología , Músculo Esquelético/patología , Modalidades de Fisioterapia , Torque , Caminata
17.
Am J Med Genet ; 61(4): 320-4, 1996 Feb 02.
Artículo en Inglés | MEDLINE | ID: mdl-8834042

RESUMEN

Fibrodysplasia ossificans progressiva (FOP) is a rare autosomal dominant disorder of connective tissue characterized by congenital malformation of the great toes and by progressive heterotopic ossification of the soft tissues in specific anatomic and temporal patterns. We observed classic findings of FOP in 2 Native American half-sisters with the same unaffected mother and different unaffected fathers. This is the first report of FOP in sibs from different pregnancies with unaffected parents. The findings in this family indicate the possibility of maternal gonadal mosaicism in FOP and provide important new data for genetic counseling in this disease.


Asunto(s)
Miositis Osificante/genética , Dedos del Pie/anomalías , Adolescente , Adulto , Niño , Femenino , Genotipo , Humanos , Masculino , Mosaicismo , Miositis Osificante/diagnóstico por imagen , Miositis Osificante/patología , Linaje , Radiografía , Dedos del Pie/diagnóstico por imagen , Dedos del Pie/patología
18.
J Orthop Trauma ; 10(2): 142-4, 1996.
Artículo en Inglés | MEDLINE | ID: mdl-8932677

RESUMEN

A case of medial subtalar dislocation associated with fracture of the posterior process of the talus is described. Although this injury pattern is uncommon, it is important to recognize the associated fracture, as it involves a weightbearing articular surface. In this case, the flexor hallucis longus also prevented anatomic closed reduction necessitating open reduction and internal fixation.


Asunto(s)
Fracturas Abiertas/complicaciones , Luxaciones Articulares/complicaciones , Articulación Talocalcánea/lesiones , Astrágalo/lesiones , Adulto , Fijación Interna de Fracturas/instrumentación , Fijación Interna de Fracturas/métodos , Curación de Fractura/fisiología , Fracturas Abiertas/diagnóstico por imagen , Fracturas Abiertas/cirugía , Humanos , Luxaciones Articulares/diagnóstico por imagen , Masculino , Radiografía , Rango del Movimiento Articular , Astrágalo/diagnóstico por imagen
19.
Foot Ankle Int ; 16(1): 14-20, 1995 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-7697148

RESUMEN

Deltoid ligament forces were studied after observing deltoid ligament insufficiency in several post-triple arthrodesis patients. Six fresh-frozen, below-knee amputation specimens were axially loaded. The results demonstrate that a properly positioned triple arthrodesis produced deltoid ligament forces that were similar to those seen with an intact tibialis posterior tendon. A triple arthrodesis in combination with a lateral displacement calcaneal osteotomy produced deltoid ligament forces that were 76% greater than those seen with the intact tibialis posterior tendon (P < .05). A triple arthrodesis in combination with a medial displacement calcaneal osteotomy produced deltoid ligament forces that were 56% less than those seen with the lateral displacement calcaneal osteotomy (P < .01). Patients with longstanding ruptures of the tibialis posterior tendon and associated peritalar subluxation/dislocation may have less than optimal clinical results after triple arthrodesis, unless the hindfoot can be properly reduced, due to persistent elevated forces in the deltoid ligament and resulting ligament laxity. This study suggests that a medial displacement calcaneal osteotomy in combination with a triple arthrodesis may be a viable treatment when the hindfoot cannot be positioned properly.


Asunto(s)
Articulación del Tobillo/fisiopatología , Ligamentos Articulares/fisiopatología , Traumatismos de los Tendones/fisiopatología , Articulación del Tobillo/diagnóstico por imagen , Articulación del Tobillo/cirugía , Artrodesis/métodos , Fenómenos Biomecánicos , Calcáneo/cirugía , Humanos , Osteotomía/métodos , Radiografía , Rotura , Tibia
20.
Clin Orthop Relat Res ; (285): 255-62, 1992 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-1446447

RESUMEN

Newborn rat calvarial bone cells were grown to confluence and subjected to a matrix of sine wave 60-kHz capacitively coupled electrical signals of various field strengths, pulse-burst patterns, and duty cycles. Both [3H] thymidine incorporation into DNA and alkaline phosphatase activity were evaluated in field strengths ranging from 0.0001 to 20 mV/cm, with pulse-burst patterns ranging from continuous to 5 milliseconds ON/495 milliseconds OFF, with daily duty cycles ranging from 0.25% to 25%. A significant increase in proliferation occurred in field strengths of 0.1, 1, and 20 mV/cm when the signal was applied continuously for six hours. Significant proliferation also occurred when the 20-mV/cm field was pulsed for six hours at 5 milliseconds ON/495 milliseconds OFF and at 5 milliseconds ON/245 milliseconds OFF. No change in alkaline phosphatase activity occurred in the 20-mV/cm field with any signal. At 1 mV/cm, there was a significant decrease in alkaline phosphatase activity in the continuous signal and in the 5 milliseconds ON/62 milliseconds OFF signal; in the lower fields evaluated, there was an actual decrease in alkaline phosphatase activity with some of the signals. The field strength plays a dominant role in determining the bone-cell's proliferative response, and to a lesser extent the alkaline phosphatase activity response, to a capacitively coupled electric field. The pulse configuration and the duty cycle are also important, but only if the proper field strength is being applied to the cell.


Asunto(s)
Estimulación Eléctrica , Osteogénesis , Fosfatasa Alcalina/metabolismo , Animales , Huesos/citología , Huesos/metabolismo , Células Cultivadas , ADN/análisis , Técnicas In Vitro , Ratas , Ratas Sprague-Dawley , Timidina/metabolismo
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