Arthrocentesis takes joint fluid out of a joint using a sterile needle. This can be done in most of the joints in the body, but it is usually done on larger ones, such as the knee or shoulder.
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Arthrocentesis is done to: Find out why a joint is painful, swollen, or fluid-filledDrain fluid out of a swollen joint to decrease pain and increase your ability to move the jointDiagnose the specific type of arthritis occurring within a jointConfirm a diagnosis of infection in the joint
Check for crystals in the joint fluid, which could be a sign of
In some cases, medication may be injected
into the joint space after the fluid has been taken out.
Problems from the procedure are rare, but all procedures have some risk. Your doctor will review potential problems, like: Infection of the jointBleeding into the jointIncreased pain
Some factors that may increase the risk of complications include: Infections on the skinRecent fever or infectionBleeding disorderUse of blood thinners
You will be asked about your medical history. A physical exam will be done, including an examination of the joint.
Imaging tests to help view internal body structures may include: X-rayMRI scan
You may be given local anesthesia. This numbs the area
where the needle will enter the joint.
The area where the needle will be inserted will be cleaned. Next, a needle attached to a syringe will be inserted into the fluid-filled joint cavity. The fluid will be drawn into the syringe. After this, medication may be injected into the joint through the needle. After the needle is removed, pressure will be put on the spot over the joint. A bandage will be placed over the area.
You may feel stinging or burning if local anesthesia is injected into the area.
When you return home after the procedure, do the following to help ensure a smooth recovery: For the first 24 hours, use an ice pack for 15-20 minutes at a time every 3-4 hours. Place a towel between your skin and the ice pack.To reduce discomfort, take a pain reliever.Ask your doctor when you can resume normal activities.
Be sure to follow your doctor's
After arriving home, contact your doctor if any of the following occurs: Signs of infection, including fever and chillsRedness, swelling, increasing pain, excessive bleeding, or any discharge from the sitePain that is not relieved by the medication you have been given
If you think you have an emergency, call for emergency medical services right away.
Arthritis and rheumatic diseases.
National Institute of Arthritis and Musculoskeletal and Skin Diseases
website. Available at:
http://www.niams.nih.gov/health_info/Arthritis/arthritis_rheumatic.asp. Updated October 2014. Accessed June 29, 2015.
Injections and procedures for knee pain. Arthritis Foundation
website. Available at:
Accessed June 29, 2015.
Synovial fluid analysis. American Association for Clinical Chemistry Lab Tests Online website. Available at:
http://labtestsonline.org/understanding/analytes/synovial/tab/glance. Updated October 8, 2014. Accessed June 29, 2015.
Zuber TJ. Knee joint aspiration and injection.
Am Fam Physician. 2002;66(8):1497-1501.
Last reviewed June 2015 by John C. Keel, MD
Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition.
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