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膝を

one’s knee

→ 膝
phrase Rare #30,725
one’s knee The particle を marks 膝 as the direct object; the phrase is usually followed by a verb.
JA: 階段で膝を打った。
EN: I banged my knee on the stairs.

君みたいによく冒険してたけど、ある時矢で膝を怪我したんだ。

I used to go on adventures just like you, but one day I injured my knee with an arrow.

トムは転んで膝をケガしたんだ。

Tom fell and hurt his knee.