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Answer: Rolando Fracture
Rolando Fracture is a 3+ part intraarticular fracture at the base of the first metacarpal (ie thumb)
Don't confuse it with the Bennett fracture, ie only a single fracture line with 2 parts.
Maybe this will help. Bennett starts with a B which is the 2nd letter of alphabet and it has 2 fragments. Rolando = comminuted. It just may be stupid enough to remember!