what are knee problems starting with the letter A?

what are knee problems starting with the letter A?alright, i have this knee problemm;
its common, but it starts with an A.
its a wierd name like archeaslwaters er something realllly wierd like that.
does anyone know?
actually;
it might start with O.
like osdagslwaters?
or somthething. idunno.
you get it in your knee.

- Miss B
Arthritis, you can get that at any age

- Zip
Osgood Slaughters

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