dystonia
noun [ C or U ] medical specialized uk/dɪˈstəʊ.ni.ə/ us/dɪˈstoʊ.ni.ə/
张力障碍（肌肉张力紊乱）
a movement disorder in which the head or an arm or leg is put into an unnatural position
Dystonias are limited to specific parts of the body, for example the neck. 张力障碍只会出现在身体的某些部分，如颈部。