Injury
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Comparative Study
A biomechanical comparison of four fixed-angle dorsal plates in a finite element model of dorsally-unstable radius fracture.
To compare the finite element models of two different composite radius fracture patterns, reduced and stabilised with four different fixed-angle dorsal plates during axial, dorsal and volar loading conditions. ⋯ There was no significant difference between 2-part (AO/ASIF type 23-A3) and 3-part (AO/ASIF 23-C2) fracture models. Maximal stresses in the plates appeared above the fracture gap; therefore, it is worth considering the development of plates without screw holes above the gap.
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The deltopectoral and the deltoid splitting approach are commonly used for the treatment of proximal humeral fractures. While the deltopectoral approach requires massive soft tissue devascularization, the deltoid splitting approach needs an additional skipped incision to avoid axillary nerve injury. The purpose of this study was to describe a modified anterolateral deltoid splitting approach with axillary nerve bundle mobilization in the treatment of proximal humeral fractures and to assess its radiologic and clinical outcomes. ⋯ The use of a modified anterolateral deltoid splitting approach with axillary nerve bundle mobilization in the treatment of proximal humeral fractures yielded excellent outcomes. This approach is a useful alternative to the deltopectoral or the deltoid splitting approaches in the treatment of proximal humeral fractures.
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The possibility of diagnosis and prediction of multiple disorders in trabecular bone through nano-biomechanics and chemical analysis are summarized. Improvements to the understating of the compositional contributors of bone mineral and organic components to mechanical competence are crucial. Viscoelastic properties and Raman characterization have been used to evaluate possible alterations of the trabecular bone associated with aging, disease, or injury. ⋯ Complementary nano-morphological studies were done assessing roughness (SRa) and collagen fibrils width, on this trabecular bone. A general idea of the behavior of the viscoelastic performance can be obtained by the Tan δ (E″/E'), that achieved 0.98GPa of damping. 249nm and 0.898μm of SRa roughness and fibrils width were obtained, respectively. The relative presence of minerals, the carbonate-to-phosphate ratio, the crosslinking and the nature/secondary structure of collagen, between 700 and 1700cm-1, were also obtained, in order to propose a study protocol for trabecular bone characterization.