You say that your knee is inflammed? Well, with this inflammation, do you have redness, swelling, a feeling of heat from around the area or any burning pain with a loss of function?
The remedy that I would suggest for this is APIS. It is a good remedy for any kinds of inflammatory processes within the body and is commonly used for bee and wasp stings and any kind of hive type reaction where inflammation is present.
Take this for a few days and see if it helps.
If it does help to bring down the inflammation, then there is another remedy called CAUSTICUM that is helpful for rheumatic pains in the limbs, burning in the joints with cracking and tension in the knees specifically.
If the Apis does work in helping to bring down the swelling, then after about three to four days you could then switch to the Causticum and see if this again helps. However, if the Apis does not help after about three days, then you can switch to the Causticum and see if this helps where the Apis has not.
Let me know how you get on and if these remedies do not help at all, then I can have another look at possible remedies that might.