Martina Donkers

He wasn't fat, he was becoming Santa. (The Santa Clause, Walt Disney Pictures)

By age 18, my knees hurt. I didn’t know why, and they didn’t hurt a lot, but they did hurt a bit most of the time. As someone who took a lot of dance classes and played my share of netball, it was annoying, but not something I thought much about. After all, I reckoned, bad knees run in my family. But by age 20, the pain had gone from a bit annoying to definitely annoying. I decided, for the first time, to see a doctor about it.

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