Inside your knee, a thin layer of tissue lines the whole joint. It's called the synovium.
Unlike cartilage, the synovium has nerves in it. So it can feel pain.
And researchers found something worth knowing. When this lining gets irritated and swollen, knees tend to hurt more.¹
So what irritates it?
Think back to when your knee was young. It felt tight. Steady. It moved in a clean line.
Over the years, the tissues around the knee can loosen. And the joint can feel a little less steady.
Most of the time, you don't notice it. Until the moments that ask the most of your knee.
Thousands of steps a day. Day after day. It adds up.
That's when you feel it. The catch when you stand up. The deep ache after a long day on your feet. The wobble on the stairs.
So maybe it was never just "worn-out cartilage."
Maybe it's a knee that doesn't feel held anymore.