objective: to determine the prevalence of fractures and associated risk factors in healthy iranian children and adolescents. methods: in this cross sectional population based study, 478 healthy iranian children and adolescents aged 9–18 years old participated. baseline data and bone mineral content and density have been determined. one questionnaire was completed for all individuals including p...

i ntroduction: the incidence and etiology of maxillofacial fractures vary widely between different countries. understanding the cause and pattern of these injuries can assist in establishing clinical and research priorities for more effective treatment and prevention of maxillofacial injuries. the study aimed to  evaluate  the  etiology  and  pattern  of  maxillofacial  fractures  in  trauma pa...

Patellar fracture is a relatively uncommon fracture especially the vertical sagittal type. In cases of high energy trauma injury, it is usually associated with fracture of ipsilateral distal femur or proximal tibia. However, the combination of vertical sagittal fracture patella and ipsilateral fracture lateral condyle is very rare. This necessitates judicious diagnosis and appropriate managemen...

Peridynamics (PD) is a nonlocal continuum theory based on integro-differential equations without spatial derivatives. The elongation fracture criterion is implicitly incorporated in the PD theory, and fracture is a natural outcome of the simulation. On the other hand, a new fracture criterion based on the crack opening displacement combined with peridynamic (PD-COD) is proposed. When the relati...

Healing of the bone is different with the other part of the body. Fracture healing is actually a bone regeneration with no scar tissues, where as in wound healing, injured tissue is replaced by  connective tissue which became a scar, Traditionally fracture healing is divided in to 4 stages: 1) Stage of inflammation; 2) Stage of soft callus; 3) Stage of hard callus and 4) Stage of remodeling. In...

rails fracture by the growth of fatigue crack or critical crack is one of the prevalent defects in railway. the rail fracture, failure and stress analysis should be studied in order to prevention of rail fracture. in this paper, new formulation of contact stress for two rolling bodies is presented, where the results are closed to the hertz stress formulation. moreover, stress analysis is done b...

BACKGROUND Upper extremity (UE) region-specific, patient-reported outcome (PRO) scales assess injuries to the UE but do not account for the demands of overhead throwing athletes or measure patient-oriented domains of health-related quality of life (HRQOL). PURPOSE To develop the Functional Arm Scale for Throwers (FAST), a UE region-specific and population-specific PRO scale that assesses mult...