Do you feel the following in your knees?

• Your knees are extremely painful.
• Your knees have hurt for a long time (e.g. three days), and the pain won’t go away.
• The pain in your knees keeps coming back.
• You hear a loud pop and you feel intense pain.

• The pain gets worse even while you’re resting.
• Your knee feels tender.
• There’s a radiating pain in your knee.
• You can tell whether the pain comes from back or the outside of your knee.

• You can’t bend or move your knee properly.
• You can’t straighten your knee.
• Your knee suddenly buckles.
• You limp, or have a hard time walking.

• You have a hard time climbing stairs.
• Your knee is swollen, bruised or looks deformed.
• You feel like there’s water inside your knee.
• Your knee is red or feels hot.