I banged into a chair and hurt my leg.

我撞到椅子上，碰伤了腿。

《牛津词典》

I fell off my bike. I hurt my leg.

我从车上摔下来了。我的腿受伤了。

youdao

I hurt my leg while playing football.

我踢足球时把腿弄伤了。

youdao

Then, about a year and half ago I hurt my leg, and I couldn't run for several months, and I began to work on the Stairmaster.

BBC: News | Monitoring | President Clinton on Shanghai radio phone-in