By the way, doctor: How long can I keep getting cortisone shots in my knee?

Q. I've been getting cortisone injections in my knee for osteoarthritis every four months. What are the possible side effects, and how long can I continue this? I'm a strong 81-year-old.

A. Cortisone is a potent anti-inflammatory drug. When injected into the knee joint, it can help reduce pain, inflammation, and swelling. However, it's not usually considered a first-line or long-term treatment for osteoarthritis.