Definition: Arthrocentesis is a procedure in which a needle is inserted into a joint in order to remove fluid. The purpose of performing arthrocentesis is usually twofold: first, the removal of excess fluid will usually decrease symptoms of pain and improve joint mobility; second, the fluid removed can be used to diagnose the problem that is causing your symptoms.
When performing arthrocentesis it is of utmost importance to observe strictly sterile conditions as joint fluid is prone to becoming infected if bacteria are introduced. For this reason the skin is cleaned well and sterile instruments are used to aspirate the joint fluid.
Also Known As: joint fluid aspiration, joint tap, synovial fluid aspiration
