Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
sprain [spreɪn] n (MED) растяже́ние
vt
to sprain one's ankle/wristрастя́гивать (растяну́ть*perf) щи́колотку/запя́стье
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.
Русский: