New Moto Guzzi Door Mats Available Now
Once you know that it *isn't* a medical issue, you probably need to go to the gym.
First of all you are asking a bunch of old fart Guzzi riders instead of a properly trained MD but you are going to get what you paid for.
It's from genuflecting every time you approach the Guzzi.
The biggest help to knees is exercise.