 [ Symptoms ] i had a knee arthroscopy 9 months ago for two meniscus tears in my left knee [ Disease ] well it can either be infection in the incision scar or can be related to lateral meniscal tears consult an orthopedician and get evaluated and an x ray or mri scan can be helpful in confirmation as of now take anti inflammatory painkillers like ibuprofen continue doing cool compresses and avoid exertion hope this helps regards