MEDICAL PROCEDURES
Joint Aspiration
(Arthrocentesis)
What is a joint aspiration?
A joint aspiration, or arthrocentesis, is a procedure whereby a sterile needle and syringe are used to drain fluid from the joint. Joint aspiration is typically performed as an office procedure or at the bedside of hospitalized patients.
What is the purpose of joint aspiration?
Joint aspiration is used to obtain joint fluid for examination in the laboratory. Analysis of joint fluid can help to define causes of joint swelling or arthritis , such as infection, gout, and rheumatoid disease. Joint fluid can be tested for white cell count, crystals, protein, glucose, as well as cultured for infection.
Joint aspiration can also be helpful in relieving joint swelling and pain. Removal of joint fluid that is inflamed can also remove the white blood cells within that are sources of enzymes that can be destructive to the joint. Occasionally, cortisone medications are injected into the joint during the joint aspiration in order to rapidly relieve joint inflammation and further reduce symptoms.
How is joint aspiration performed?
The skin over the joint is sterilized using a liquid, typically iodine solution (Betadine). Local anesthetic is used in the area of the joint; either by injection, topical liquid freezing, or both. A needle with a syringe attached is inserted within the joint an fluid is sucked back (aspirated) into the syringe. For certain conditions the doctor will also inject medication into the joint after fluid removal. The needle is then removed and a band-aid or dressing is applied over the entry point.
What are complications of joint aspiration?
Complications of joint aspiration are uncommon. Possible complications include local bruising, minor bleeding into the joint, and loss of pigment in the skin that was entered by the needle. A rare, but serious, complication of joint aspiration is infection of the joint (septic arthritis).
If cortisone-related medications (corticosteroids) are injected into the joint, additional uncommon complications include inflammation in the joint as a result of the medication crystallizing, shrinkage (atrophy) or loss of pigment of skin at the injection site, increased blood sugar (worsening of diabetes mellitus ), and aggravation of preexisting infection elsewhere in the body. If multiple injections with corticosteroids are given too frequently it is possible to develop systemic side effects (side effects throughout the body), such as weight gain, puffy face and trunk, and easy bruising.
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