In less serious cases, water on the knee and knee pain treatment can be as simple as taking a rest. The knee is susceptible to injury because of how often it is used and the movements it is required to make. Twisting, bending, rotating and straightening of the knee joint can lead to considerable stress on the joint.
When the knee becomes damaged and swelling reaches a point where it needs to be relieved quickly, a doctor may suggest that a patient have the knee aspirated.
During the aspiration procedure, a doctor will insert a bore needle into the knee and slowly draw back the plunger to draw out the excess fluid from the knee joint. The doctor may also move the knee about to coax out as much fluid as possible.
Some patients have enough fluid in their knees to fill more than one syringe. An anesthetic is used during the procedure. Otherwise, as you can imagine, it would be extremely painful for the patient.