My knee has been swollen and painful for months, looks crooked aswell. What could be wrong with it?

Swollen Knee. You need to see your doctor to find out what is wrong with your knee.First I do not know your age, is there history of trauma.It is quite common and swelling is usually due to effusion, what people call water on the knee.It can be around the knee or in the knee itself.It can be due to inflammation or trauma causing meniscus tear or injury to ligament and fluid may be blood need exam and xrays/mri.