introduction the debate regarding the description on classification and nomenclature of the injury which includes olecranon fracture associated with radial neck fractures in children is ongoing. we report two pediatric cases that could not be classified in a monteggia-equivalents system and were treated with open reduction and k-wire fixation. the aim of this study was to perform a systematic r...

Rapid advances are taking place to develop hydrogels of high stretchability and toughness, but fatigue fracture has not been studied for any hydrogels. This negligence hinders the development of hydrogels and their applications. Herewe initiate a study of fatigue fracture of hydrogels.We choose polyacrylamide hydrogel as a model material. To place fatigue fracture in context, we apply monotonic...

Rapid development of engineering activities expands through a variety of rock engineering processes such as drilling, blasting, mining and mineral processing. These activities require rock dynamic fracture mechanics method to characterize the rock behavior. Dynamic fracture toughness is an important parameter for the analysis of engineering structures under dynamic loading. Several experimental...

Introduction: Post and core has been considered for endodontically treated tooth, especially in cases with severe damage crowns. Recently fiber reinforced composite posts (FRC post) have been used in the treatment of endodontically treated teeth. Because the length and diameter of posts are effective in stress distribution, the purpose of this study is to evaluate the effect of length and diame...

Background & Aims: Osteosarcoma is one of the most prevalent malignant bone tumors . This study is designed to assess the prognostic effect of pathologic fracture and treatment options on survival of patients with osteosarcoma. Materials & Methods: In this study, prognosis of 106 patients with limb osteosarcoma, which were treated at three  hospitals in Tehran from April to August 2012 ...

t-condylar fracture of distal humerus in young children is very rare. pure physeal fractures of the olecranon are also rare. we report on an extremely rare case of concomitant ulecranon fracture, ipsilateral segmental humerus and intercondylar humerus fracture (type iii) in a skeletally immature patient.

acute lymphoblastic leukemia (all) is the most common form of childhood cancer representing 80-85% of all leukemia. we describe a 3 years old girl with pain, swelling and tenderness in extremities since 8 months prior to her present admission. x-ray of extremities revealed callus formation, osteopenia and site of healed fractures. bone marrow aspiration revealed all-l2 with normal peripheral sm...

 Background: A rare and devastating complication following anterior cruciate ligament (ACL) revision reconstruction is femoral fracture.    Case presentation: A 35-year old male soccer player with a history of ACL tear from the previous year ago, who underwent arthroscopic ACL reconstruction and functioned well until another similar injury caused ACL re-rupture. Revision of ACL reconstruction w...

Fracture assessment of U- and V-notches is important in mechanical engineering. One can use the J-integral as fracture parameter in order to predict the critical fracture load in notches. The critical value of the J-integral in cracks is a function of the material properties. In notches, however, the material properties as well as the notch dimensions affect this critical value (named fracture ...