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The problem of crack propagation in human bone is studied. We for- mulate and solve the mathematical problem for the pre-stressed crack in Mode I of classical fracture. Using the boundary conditions on the crack faces in the bone, regarded as an elastic composite material, we solve our Riemann-Hilbert problem. Using generalized Sih's strain energy density generalized and maximum stress criteria we find the direction of the crack path in Iliac bone, regarded as a pre-stressed orthotropic composite.

The neuropsychiatric manifestations of SLE are varied and may be classified as primary neurologic and psychiatric disease (related to direct involvement of the nervous system] or secondary disease (related to complications of the disease and its treatment), Estimates of the prevalence of neuropsychiatric manifestations o f SLE have ranged from 14% to over 80% in adults. The wide range in reported prevalence reflects in part the use of different criteria for neuropsychiatric disease. It seems that 28-40% of these manifestations develop before or around the time of the diagnosis of SLE. Our poster will focus on the clinical presentation, diagnosis and treatment strategies of neuropsychiatric lupus (NPSLE) in a series of 5 recent cases. [ABSTRACT FROM AUTHOR]