ResumoEmbora os tumores lipomatosos sejam comuns, a ocorrência intra-articular é extremamente rara e escassamente descrita na literatura. Em relação a essas entidades raras, a maioria é benigna, tumores de crescimento progressivo e geralmente ocorrem no joelho, mas é crucial distinguir o menos frequente lipoma arborescens (LA) do lipoma sinovial mais raro, pois diferem na apresentação e na patogênese. A ressonância magnética é o exame de escolha na avaliação e no diagnóstico diferencial desses casos, desempenhando um papel central nos dias de hoje.A excisão e sinovectomia, quer artroscópica quer por artrotomia, proporcionam bons resultados com baixas taxas de recorrência. Ao relatar dois casos distintos tratados cirurgicamente de tumores lipomatosos intra-articulares do joelho, os autores pretendem revisar a literatura e discutir sua etiologia, aspectos clínicos e de imagem, bem como a abordagem do tratamento.
The residual fatigue life of a corroded riser joint can be evaluated by means of a fatigue analysis based on S-N data. In this case nominal stresses are determined through a global riser analysis in which the drilling riser is modeled as a tensioned beam subjected to loads throughout its length and with boundary conditions at each end. The effect of the corrosion defects is taken into account multiplying the nominal stresses by stress concentration factors derived by local Finite Element analyses of the riser joints containing corrosion defects.In this paper the fatigue life assessment of a drilling riser containing corrosion pits is presented. These pits are situated on the external surface of the riser joints. Five depths of corrosion pits are considered: 12.6%, 20.1%, 30.2%, 40.3% and 50.3% of the riser wall thickness. Stress concentration factors are calculated using solid Finite Element models and the fatigue analyses are performed considering the wave loads and the vortex induced vibrations. The results show the possibility of operational life extension of riser joints that would have to be replaced according to the usual acceptance criterion.
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