My knee keeps swelling it hurts, i dislocated it bout 4 years ago...what can i do? its feels like its turing over when i walk! i've used ice an heat

Patella instability: It sounds like you may have some chronic patella instability. While ice, nsaids and quad strengthening may help, i would suggest an orthopedic exam she may ultimately require a surgical procedure to correct the problems if conservative treatment is not sufficient to eradicate the symptoms.

Long road: If you dislocated your kneecap, you may have residual instability. Have you done any therapy? You may need reconstruction of a ligament in your knee if you are continuing to have problems this far out from your injury. It sounds like you would benefit from an MRI and a physical exam by an orthopedic surgeon or sports medicine doc to see exactly what is going on inside of your knee.

Consult Orthopedics: This sounds like a complicated orthopedic surgery problem. You should consult an orthopedic surgeon. The swelling and symptoms you describe are certainly not normal and suggest a major joint problem. Exam, x-rays, and MRI will likely be needed. Treatments could include therapy, bracing, anti-inflammatory meds, injections, and possibly surgery. You should not let this persist.