When one part goes wrong it takes over the whole conversation. Meanwhile the other knee has been carrying an unfair share of the load for a year without a single complaint.
That is most of the body, and it never comes up at appointments, because there is nothing to say about it.
It simply keeps going, quietly compensating.
Gratitude of that kind is hard to summon on demand. But you could pick one part that has had no attention all year — the left hand, the jaw, an ankle that has never once let you down — and give it thirty seconds.