In-Vivo Corrosion and Fretting of Modular TI-6AL-4V/CO-CR-MO Hip Prostheses: The Influence of Microstructure and Design Parameters

The purpose of this study was to evaluate the incidence of corrosion and fretting in 48 retrieved titanium-6aluminum-4vanadium and/or cobalt-chromium-molybdenum modular total hip prosthesis with respect to alloy material microstructure and design parameters. The results revealed vastly different performance results for the wide array of microstructures examined. Severe corrosion/fretting was seen in 100% of as-cast, 24% of low carbon wrought, 9% of high carbon wrought and 5% of solution heat treated cobalt-chrome. Severe corrosion/fretting was observed in 60% of Ti-6Al-4V components. Design features which allow for fluid entry and stagnation, amplification of contact pressure and/or increased micromotion were also shown to play a role. 75% of prosthesis with high femoral head-trunnion offset exhibited poor performance compared to 15% with a low offset. Large femoral heads (>32mm) did not exhibit poor corrosion or fretting. Implantation time was not sufficient to cause poor performance; 54% of prosthesis with greater than 10 years in-vivo demonstrated none or mild corrosion/fretting.

The Other Face of Cuban Medical Diplomacy: Domestic Impact

Since 1963 Cuba has provided medical assistance to third world countries while gaining international, political and economic support from its participating liaisons. But what exactly have been Cuba’s domestic consequences of such medical diplomacy? While the Cuban government sends many of its medical professionals and supplies abroad, the country suffers from extreme scarcity and a deterioration of its healthcare system. The purpose of my research is to enquire more on the consequences of such medical diplomacy on the Cuban healthcare system and how it has affected domestic medical infrastructure, health professionals working on the island as well as the quality of service. In carrying out this examination, I will rely on the use of information from books written by Cuban medical professionals on their personal experiences within the medical system, and patients treated on the island. I will also make active use of academic journals and articles on the Cuban healthcare system. Most of what has been written on Cuban medical diplomacy and internationalist missions are favorable critiques praising the Cuban government. Nevertheless, personal testimonies found in Dr. Dessy Mendoza Rivero’s Dengue: La Epidemia Secreta de Fidel Castro and in Dr. Jose Luis Comas and Dr. Luis Ovidio Gonzales’ Cuba: Medicina y Revolucion reveal a different side to this seemingly pleasant and good natured international exchange. As a Cuban who lived on the island, I personally suffered the consequences of such medical diplomacy and believe others will find benefit in arming themselves with knowledge on the issue.

Ficcion de racionalidad: La memoria como operador mitico en las esteticas polares de Jorge Luis Borges y Jose Lezama Lima

The aesthetic placement and period designation of Jorge Luis Borges (1899–1986) and José Lezama Lima (1910–1976) are complicated issues among critics. Borges is considered a predecessor of the Latin American literary “boom,” but despite that taxonomy his work transcends that definition and provides a foundation for new trends, such as the “neobarroco” cultivated by Severo Sarduy. Lezama is considered part of the second wave of the “boom,” but his work feeds, stylistically, from the Spanish baroque. At the same time, Lezama's daring treatment of homoeroticism and his system of images place him after the “boom” in a narrative style that is postmodern. This study undertakes a revision of external and internal issues, revealing the key fictive elements that characterize both writers. Through discourse analysis, a poetic system is formulated, which incorporates features of the “neobarroco,” and postmodern narrative styles. ^ This dissertation uses a polar structure to analyze both poetic visions and finds that they are symmetrical. From this perspective, Borges and Lezama belong to the “core” of literature that centers its emphasis in the creation of a system versus other modes of writing in which mimetic function prevails. By doing this and by recycling world culture, they create postmodern myth: the new building material for Hispanic American literature. ^ There are a few studies that explore the works of Borges and Lezama within the context of Baroque aesthetics. This dissertation offers a comprehensive analysis that considers their poetic visions at large. Besides the difference in perspective, defined as macro-spatial in Borges and micro-spatial in Lezama, there are many similarities. Both writers question the cause and effect relationship and the use of metaphor. They share a redefinition of genre as well as a hedonistic approach to literature. This kinship in poetic vision is revealed through the polar method used for this study, which proposes a new form of aesthetic placement and period designation. ^