deformation       
noun [ C or U ] uk/ˌdiː.fɔːˈmeɪ.ʃən/ us/ˌdiː.fɔːrˈmeɪ.ʃən/
 变形,扭曲
the action of spoiling the usual and true shape of something, or a change in its usual and true shape
  The deformation of the bones was caused by poor diet. 骨头的变形是由于饮食不良造成的。 
 She had an accident which caused a slight deformation of her foot. 她发生了一次事故,导致她的脚轻微变形。 
 See: deform
 - More examples
 - The nerve pain is caused by connective tissue deformation.
 - During earthquakes, ground deformation can cause critically important pipelines to collapse.
 - Deformation of the bones often indicates fracturing.