Arthrocentesis is also known as joint aspiration. This is usually a test wherein a small sample of joint fluid is withdrawn by using syringe and needles.

The location of joints is at the place where two bones meet. This allows the human body to move. Even the hips, ankles, knees, shoulders, knuckles and elbows are allowed to move.  A synovial fluid is contained in the joints. This plays the role of a lubricant and helps them to move easily. In this procedure, there is an insertion of needle into the joint where the fluid is removed. There are many purposes of performing arthrocentesis. First of all the excess fluid is removed. Hence, the symptoms decrease. The pain is reduced and joint mobility is improved. Secondly the fluid that is removed helps in diagnosing the problem due to which symptoms are caused.

While performing arthrocentesis, it is very important to observe the sterile conditions very strictly. This is because the joint fluid can become infected if the introduction of bacteria is done. For this reason, the skin has to be well cleaned. Sterile instruments are used for the aspiration of joint fluid. In arthrocentesis, the insertion of needle is carefully done in the joint for the collection of sample of synovial fluid.

Arthrocentesis is performed by the doctors for examining the synovial fluid and for detecting and ruling out the suspected diseases in a joint. Joint aspiration is done for helping in diagnosing arthritis. A lot of redness, warmth, pain and swelling are caused due to arthritis. This causes difficulty in moving the joints.

Arthrocentesis can also help in determining whether there is bacterial infection in the joint.  This also helps in determining serious types of arthritis such as juvenile rheumatoid arthritis and systemic lupus erythematosus. This condition is not only diagnostic but also therapeutic. This helps in relieving swelling and pain.