DEAR DOCTOR K: I’ve been playing tennis for years, but lately I’ve been sidelined by elbow pain. What can I do? DEAR READER: Elbow pain is the bane of tennis players. It has kept me off the courts for several months at a time. Let’s talk about how to get you back on the court — and prevent a repeat injury.

DEAR DOCTOR K: I have pain in my kneecap, right in front of my knee. It hurts to walk down the stairs or even sit for too long. What can I do? DEAR READER: It sounds like you have what is called patellofemoral pain. That’s pain where your kneecap (patella) meets your thighbone (femur). It usually results from overdoing exercise. Fortunately, there’s a lot you can do to prevent and relieve this pain.