Native speaker
In Emirati Arabic, “Knee” is رُكبة (rukba).
رُكبة
Knee
It's in the phrasebook under At the doctor, with 251 more like it.
kilya
shifaayif
galub
kabid
raas
ree'atayn
Source: DLIFLC Emirati Basic Language Survival Kit (2007). Credits and licences