“While the foot sprain has healed, Embiid experienced an increase in swelling in his left knee following the workout,” the ...

I’ m a 53- year-old woman, and I’ ve been athletic all my life. I’ m in a soccer league and have a grinding pain in my right knee. I’ ve had knee injuries in the past, and now I’ m told I might need a ...

Jennifer Kahn is a contributing writer for the magazine who has written on a range of scientific innovations.