Rest, ice, elevation, compression and anti-inflammatory medicine are viable home remedies that can reduce excess fluid in the knee, according to Progressive Health. Arthrocentesis is a clinical procedure that doctors use to remove fluid from a knee, according to Mayo Clinic.
Arthrocentesis is the removal of synovial fluid that lubricates joints using a needle and syringe, according to Healthgrades. The doctor tests the fluid to diagnose the cause of effusion. Causes include infection, arthritis and joint injury. In some cases, a doctor may inject an anesthetic, steroid or corticosteroid to treat infection or inflammation once he has removed the fluid.