However, it's worth noting that this is a literal translation and not commonly used in everyday conversation. Depending on the context, other more natural translations might be:
* "Cymalau" (just "joints") if referring to knuckles in general
* "Cymalau'r bysedd" (literally "finger joints") if specifically referring to finger knuckles
* "Pum bys" (literally "five fingers") if referring to the knuckles on the back of the hand
The most appropriate translation will depend on the specific situation and what you want to convey.