膝ひざ頭がしら

noun

kneecap; knee

Refers to the front part of the knee, especially the bony prominence. Often used when talking about hitting or injuring the knee.

• 転ころんで膝ひざ頭がしらをすりむいた。

  I fell and scraped my knee.

• 机つくえの角かどに膝ひざ頭がしらをぶつけた。

  I bumped my knee against the corner of the desk.