Objective: In this paper, finite element model of the L4 vertebra subjected to combination of compression and flexion loading in isotropic and anisotropic cases is investigated. Methods: In both cases, the vertebra is considered homogeneous. Also, the body of vertebra is divided to cancellous and cortical sections in anisotropic model, but the process is assumed isotropic such as isotropic mode...

Mice in which all members of the Hox10 or Hox11 paralogous group are disrupted provide evidence that these Hox genes are involved in global patterning of the axial and appendicular skeleton. In the absence of Hox10 function, no lumbar vertebrae are formed. Instead, ribs project from all posterior vertebrae, extending caudally from the last thoracic vertebrae to beyond the sacral region. In the ...

introduction: the aim of this study was to investigate the presence and distribution of cell surface terminal sugars in developing cartilage of the primordial vertebrae in rat embryo. material and methods: fifty female and 25 male wistar rats were chosenrandomly. after adaptation, mating was done. vaginal plug observationwas performed on o-day of gestation. specimens were collected from 9-18 da...

Radiologist always examines X-ray to determine abnormal changes in cervical, lumbar & thoracic vertebrae. Osteophyte (bony growth) may appear at the corners of vertebrae so that vertebral shape becomes abnormal. This paper presents the idea from Image processing techniques such as customised Hough transform which will be used for segmentation which should be independent of rotation, scale, nois...

The ossification centers onset of the quail vertebrae, ribs, and sternum in embryos and hatchling birds was studied. Specimens were cleared, stained with Alcian Blue and Alizarin Red S and examined using stereomicroscope. The chondral rudiments of the vertebrae were observed at the 6th day of incubation (E6). The osteogenesis of the vertebrae was accomplished with both perichondral a...

conclusion the relationship between calcification of teeth and maturation of cervical bones was significant. bone maturation can be predicted by using teeth calcification stages, especially in the second molar, first molar and lateral incisor. results correlations between the two stages were observed in the first and second premolars, canine and central incisors. all these correlations were sig...

objective: the aim of this cross-sectional analytic study was to evaluate the diagnostic efficacy of panoramic-based indices of the mandible (mental index-mi, mandibular cortical index-mci and panoramic mandibular index-pmi) and to determine their correlation with bone mineral density (bmd) of the femoral neck and lumbar vertebrae (l2-l4) in order to assess the possibility of using these parame...

Correct screw placement is especially difficult in the upper thoracic vertebrae. At the cervicothoracic junction (C7-T2), problems can arise because of the narrowness of the pedicle and the difficulty of using a lateral image intensifier there. Other upper thoracic vertebrae (T3-6) pose a problem for screw insertion also because of the narrower pedicle. We inserted 154 pedicle screws into 78 ve...

background prediction of skeletal growth is necessary for growth modification and surgical orthodontic treatments and is usually done by assessing skeletal maturity indicators in hand-wrist radiographs. the use of growth stages of cervical vertebrae in lateral cephalograms has been suggested to avoid overexposure. objectives this study seeks to assess the degree of agreement between hand-wrist ...

Asymmetrical growth of the vertebrae has been implicated as one possible etiologic factor in the pathogenesis of adolescent idiopathic scoliosis. The longitudinal vertebral growth derives from the endochondral ossification of the vertebral growth plate. In the present study, the growth plates from the convex and concave side of the vertebrae were characterized by the method of histology and imm...