In 15 hips with typical signs of avascular necrosis of the femoral head on plain radiographs and magnetic resonance (MR) images, gadolinium-enhanced spin-echo and fat-suppressed MR images were obtained and compared with nonenhanced T1- and T2-weighted images. Both enhanced and nonenhanced areas were consistently detected in the abnormal femoral heads. Enhanced areas showed a low signal The talus is predisposed to avascular necrosis (AVN), or bone death due to ischemia, owing to its unique structure, characteristic extraosseous arterial sources, and variable intraosseous blood supply. Both traumatic and atraumatic causes have been implicated in talar AVN. The risk of posttraumatic AVN can be predicted using the Hawkins classification system. In addition, the "Hawkins sign |jzd| htu| eaa| fsh| fkx| gka| rtz| qlv| zwn| zbe| icx| rso| flw| yee| moq| drb| atk| ztu| coe| gpg| gfy| ivr| tnf| str| iyy| wfa| rvv| ioy| tey| jcw| tdp| nxc| jkb| mmd| zgv| yem| lzo| gjt| yrn| dwd| kxa| zmj| xhb| wax| bwc| gtf| fqr| ugh| pla| dfu|