What does arthrocentesis involve?

Arthrocentesis is a medical procedure that specifically involves the insertion of a needle into a joint space for two primary purposes: injecting medication or aspirating (removing) excess fluid. This procedure is commonly performed to relieve pressure from swollen joints, diagnose joint disorders, or administer therapeutic agents such as corticosteroids directly into the joint.

The definition of arthrocentesis encompasses the roles of both aspirating fluid, which helps to evaluate joint conditions or relieve discomfort caused by swelling, and delivering medication directly to the affected area, thereby maximizing its localized effect.

The other answer choices refer to different medical procedures unrelated to arthrocentesis, such as injections into muscle tissue, surgical incisions on the skin, or venipuncture for blood sampling, which do not involve joint spaces or the goals of arthrocentesis. Understanding the specific objectives and methods involved in arthrocentesis highlights its importance in the management of joint-related issues.