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Search Results: 1 - 10 of 148393 matches for " Nathan F. Gilbert "
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Distal Femur Allograft Prosthetic Composite Reconstruction for Short Proximal Femur Segments following Tumor Resection
Bryan S. Moon,Nathan F. Gilbert,Christopher P. Cannon,Patrick P. Lin,Valerae O. Lewis
Advances in Orthopedics , 2013, DOI: 10.1155/2013/397456
Abstract: Short metaphyseal segments remaining after distal femoral tumor resection pose a unique challenge. Limb sparing options include a short stemmed modular prosthesis, total endoprosthetic replacement, cross-pin fixation to a custom implant, and allograft prosthetic composite reconstruction (APC). A series of patients with APC reconstruction were evaluated to determine functional and radiologic outcome and complication rates. Twelve patients were retrospectively identified who had a distal femoral APC reconstruction between 1994 and 2007 to salvage an extremity with a segment of remaining bone that was less than 20 centimeters in length. Seventeen APC reconstructions were performed in twelve patients. Eight were primary procedures and nine were revision procedures. Average f/u was 89 months. Twelve APC reconstructions (71%) united and five (29%) were persistent nonunions. At most recent followup 10 patients (83%) had a healed APC which allowed WBAT. One pt (8%) had an amputation and one pt (8%) died prior to union. Average time to union was 19 months. Four pts (33%) or five APC reconstructions (29%) required further surgery to obtain a united reconstruction. Although Distal Femoral APC reconstruction has a high complication rate, a stable reconstruction was obtained in 83% of patients. 1. Introduction Resection of large skeletal tumors can result in short metaphyseal juxtaarticular segments of host bone which can pose a reconstructive challenge to the musculoskeletal tumor surgeon. In addition, aseptic loosening or fracture around a standard reconstruction can lead to loss of bone stock so that only a short metaphyseal segment of host bone remains for fixation in revision surgery. Limb salvage reconstructive options in this scenario include the use of a standard endoprosthesis with fixation of the stem into the short segment of host bone, use of custom implants allowing for cross-pin fixation of the endoprosthesis to the host bone, use of an endoprosthesis to replace the entire bone, and use of a composite of an allograft and an endoprosthesis [1–3]. Use of a standard, modular endoprosthesis with cement or press fit fixation in this setting has not been directly investigated to our knowledge; however, the use of a short stem cemented into the metaphyseal segment would be expected to have a high rate of aseptic loosening due to the high stress imparted on the relatively short interface between host bone and cement [2] (Figure 1). Use of cross-pin fixation of a custom prosthesis to host bone has been described previously with a low rate of aseptic loosening
The Use of Human Rights for the Protraction of War
Nathan Gilbert Quimpo
Kasarinlan : Philippine Journal of Third World Studies , 2006,
Abstract: Despite declaring their intentions to recognize human-rights standards and international humanitarian law through the signing of the Comprehensive Agreement on Respect for Human Rights and International Humanitarian Law (CARHRIHL), neither the Government of the Republic of the Philippines (GRP) nor the Communist Party of the Philippines -New People’s Army-National Democratic Front (CPP-NPA-NDF) have been truly determined to improve the human rights situation in the Philippines caused by almost four decades of conflict. Both sides wish to destroy each other militarily as well as use the peace talks as a diversionary tactic. To say that one or both sides are not really serious about the whole process may seem too facile an explanation for the lack of progress in the talks. But indeed, neither side has demonstrated genuine sincerity to the process. The Philippine government is dominated by a politico-economic elite composed of powerful families that manipulate elections through patronage, corruption, and violence. Meanwhile, the CPP-NPA-NDF seeks to overthrow the government and establish a “people’s democracy” based on a Stalinist-Maoist one-party dictatorship. The solution lies in third party forces: civil-society organizations and international political entities
CADET 2 results/computer-aided detection update
F Gilbert
Breast Cancer Research , 2008, DOI: 10.1186/bcr2010
Abstract: The CADET II trial was a prospective multicentre randomised comparison of single reading with CAD and double reading in the UK National Health Service Breast Screening Programme. Over 30,000 women (age 50 to 70 years), attending routine mammo-graphy at three UK breast screening centres, were recruited into the trial. Film batches from screening sessions were randomly assigned in a ratio of 28:1:1 to one of three film-reading regimes: double reading and single reading with CAD, or double reading only, or single reading with CAD only. The primary outcome measures were matched comparisons of the cancer detection rates and the number of women recalled for assessment by the two reading regimes. The results of the study will be presented at the conference. The implications of this study will be discussed together with further work that needs to be undertaken.
The effect of arbitrarily small rigidity on the free oscillations of the Earth
F. Gilbert
Annals of Geophysics , 1997, DOI: 10.4401/ag-3857
Abstract: The system of propagator equations for an elastic solid becomes singular as the shear modulus becomes vanishingly small. In computational applications there is severe loss of precision as the limit of zero shear modulus is approached. The use of perturbation theory to address the effect of very small shear modulus, using the fluid state as a basis, is unsatisfactory because certain phenomena, e.g., Rayleigh waves, cannot be represented. Two approximate methods are presented to account for the singular perturbation. Since most of the Earth is nearly neutrally stratified, in which case the motion is nearly irrotational, one can impose the irrotational constraint and obtain a modified and reduced system of propagator equations. This system does not have the singular perturbation. In the second method the transition zone between a fluid and a solid is represented as an infinitesimally thin, Massive, Elastic Interface (MEI). The boundary conditions across the MEI are dispersive and algebraic. The limit of zero shear modulus is non-singular.
Romantic Relationship Status and Gender Differences in Sun Tanning Attitudes and Behaviors of U.S. College Students  [PDF]
Terry F. Pettijohn II, Terry F. Pettijohn, Alexandra G. Gilbert
Psychology (PSYCH) , 2011, DOI: 10.4236/psych.2011.22012
Abstract: Male and female college students (n = 353) involved in varying degrees of romantic relationships responded to a questionnaire investigating sun tanning attitudes and behaviors. Females were predicted to engage in sun tanning more frequently and have more positive attitudes about sun tanning than males. Those students who were dating were also predicted to engage in more sun tanning behaviors and have more positive attitudes regarding tanning compared to students who were not dating, in committed romantic relationships, or married. Results supported these predictions overall. Females, and college students who were dating, engaged in more risky sun tanning behaviors and are therefore especially at risk for health related consequences of sun tanning.
Elevation gradients of flower visitation on a mesa in the Nama Karoo, South Africa
P Kirk, F Gilbert
Egyptian Journal of Biology , 2009,
Abstract: We investigated the composition of the insect fauna visiting flowers on the mesa of Tafelberg (Eastern Cape, South Africa). During the season-long study, 1825 individuals of 55 insect species were recorded visiting flowers of 28 species plants within permanent quadrats. Four taxa were very common as flower visitors, with between 2-300 individual visits recorded (one species from each of the orders of Hymenoptera, Diptera, Lepidoptera and Coleoptera). Two-thirds of all visits were to the composite Pencia punctata (Asteraceae). There was a strong pattern to the diversity of the flower-visiting fauna, with diversity increasing with elevation. This pattern matched the availability of flowers, which were much more abundant on the top of Tafelburg than on its lower slopes.
Review: Egyptian science - how good is it ? Can it be improved ?
F Gilbert, S Zalat
Egyptian Journal of Biology , 2009,
Some problems when calculating the quantum corrections to the classical 't Hooft-Polyakov monopole
Nathan F. Lepora
Physics , 2002, DOI: 10.1016/S0370-2693(02)01871-3
Abstract: We examine whether the analysis of quantum corrections for the kink soliton carries over to the 't Hooft-Polyakov monopole. For the kink, it is central that the quantum fluctuations are eigenmodes of a Hermitian operator. For the monopole, we show the analogous operator is not Hermitian. This property raises some questions about the quantization procedure for a 't Hooft-Polyakov monopole.
Vacuum Geometry
Nathan. F. Lepora
Physics , 1999, DOI: 10.1088/1126-6708/1999/11/034
Abstract: We analyse symmetry breaking in general gauge theories paying particular attention to the underlying geometry of the theory. In this context we find two natural metrics upon the vacuum manifold: a Euclidean metric associated with the scalar sector, and another generally inequivalent metric associated with the gauge sector. Physically, the interplay between these metrics gives rise to many of the non-perturbative features of symmetry breaking.
Gauge Unification within the Dual Standard Model
Nathan F. Lepora
Physics , 1999, DOI: 10.1088/1126-6708/2000/02/036
Abstract: We calculate the gauge couplings in the dual standard model. These values are consistent with an associated GeV mass scale, and predict the weak mixing angle to be ${\sin^2 \theta_w} (M_Z) \sim 0.22$.
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