Hi,
So your patella is the kneecap.. and so the problem you might have (it's quite common) is where is doesn't move neutrally (up and down) when you run.
This can be simply because one side of your upper leg muscles is stronger than the other - but it can also be because of weaker tendons etc.
The other thing it might be is ITB syndrome .. where your iliotal band is tight and scrapes across the kneecap. Have a look for ITB problems and patella tracking problems online and hopefully that'll help
