dystonia

詳細解釋：

dys.to.ni.a

n.（名詞）
Abnormal tonicity of muscle, characterized by prolonged, repetitive muscle contractions that may cause twisting or jerking movements of the body or a body part.
肌張力不全，肌張力異常：肌肉張力異常，特徵為長時間不斷重複的肌肉收縮及並發的身體或肢體的抽筋與痙攣

【引伸】
dyston.ic