*in as calm a voice as possible (though of course she's worried about this latest crazy installment in her client's life)* Please don't worry too much. He had some sort of accident and his right wrist is rather badly broken. He's had surgery which went well but that's not the main concern.
*pauses, partly to figure out how to say this and partly to give you time to take it in* He has lost his memory, pretty much completely. The doctors have been concerned that he has some sort of brain injury or disease, though all the tests they've done so far have been clear. I guess they've ruled out stuff like tumours and swelling and, talking to his neurologist, I think that maybe they're considering some sort of psychiatric problem.
*in a more cheerful voice* Having said all that, he is quite well physically and is certainly very calm and accepting right now.