“The meniscus, a cushion between the knee bones, can tear from a simple twist, causing pain and swelling that makes the knee feel stiff or 'locked.' When this happens, simple movements like squatting ...
The pain typically worsens when the knee is in a flexed position ... start with a physical examination to check for symptoms like swelling and tenderness and to test the range of motion and ...
While you may be tempted to hang out on the couch if one or both of your knees hurt, exercise — Pilates in particular — may be a much better option. It all depends on the reason for your pain.