I would like to know how old are you. If you are above fifty this is knee arthritis
can required analgesics and rest. If x ray
is normal it is in early stage.if you are below 50, I would recommend you to get MRI
that will going to tell us of there is any synoviyal hypertrophy is present. I would also suggest you to get blood investigation like CRP,ESR
and Ra factor to make sure if there is rheumatoid element is present.