I posted a message few days ago and didn't get any reponse

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Can someone please help me?
I dislocated my left knee 14 years ago. I didn't get any surgery (it wasn't recommeded) and everything was very close to normal until 10 days ago. I was walking around the house and felt sudden, sharp pain in my left knee, somewhere to the left of the knee cap. That was followed by a more general pain at movement and stiffness.
I can only wlak very slowly because of the pain and stiffness. I assumed it was some kind of arthritis and tried to get a lot of rest.
Does anyone know what else it could be?
Thank you!
Aura