Katakana term for the knee. It is less natural than 膝 for everyday anatomy, but common in compounds such as ニーサポーター and ニーキック.
I bought a knee support for running.
格闘技の試合でニーキックが決まった。
A knee kick landed in the martial arts match.
over-knee · over-knee socks; over-knee boots
knee grip; gripping with the knees
knee drop
Only the katakana form. The exact language-of-origin note is not supplied; the spelling is conventionally used in loanword-style terms meaning 'knee'.