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Arthrocentesis (Joint Aspiration)

Medically reviewed by: Amy W. Anzilotti, MD

What Is Arthrocentesis?

Arthrocentesis (also called joint aspiration) is a procedure where a doctor uses a needle to take fluid out of a joint. Joints are where two bones meet. They allow our bodies to move. The hips, knees, ankles, elbows, shoulders, and knuckles are all joints. 

Why Is Arthrocentesis Done?

Arthrocentesis is done to:

  • understand why a joint is swollen or sore
  • relieve pain by taking fluid out of a joint