Dancing with the Stars contestant Ralph Macchio had been out of rehearsals several times this past week due to pain caused by a ruptured Baker’s cyst behind his knee. The 49-year-old former Karate Kid ...

Q: What is a Baker's cyst, and what is the best way to get rid of it? A: A Baker's cyst is a collection of fluid behind the knee. It was named after a British surgeon, William Baker, who described ...

Baker's cyst is a membrane-lined sac of fluid that forms behind a person's knee. There is fluid that is normally in the knee joint used to lubricate the joint, much as oil is used to prevent friction ...

DEAR MAYO CLINIC: I developed a Baker’s cyst on the back of my knee several months ago. My doctor drained the fluid from it, but now it’s back. What could be causing this? What is the best way to ...