This is an irregular verb. It follows the conjugation pattern of the verbs llover and vencer.
Present:
Me tuerzo el tobillo a menudo cuando corro en terreno irregular.
I often sprain my ankle when I run on uneven ground.
Preterite:
Ayer se torció la muñeca.
She sprained her wrist yesterday.
Imperfect:
Cuando jugábamos al fútbol de niños, nos torcíamos los tobillos a menudo.
When we played soccer as kids, we often sprained our ankles.