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Related Concept Videos

Endoscopic Studies II: Thoracocentesis01:26

Endoscopic Studies II: Thoracocentesis

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Thoracentesis(Thoracocentesis), commonly known as pleural tap, is a medical procedure where a 22 gauge needle is inserted into the pleural space, the area between the lung and chest wall. This procedure is commonly performed to diagnose or treat various respiratory disorders.
Description
Excess pleural fluid or air may accumulate in some respiratory disorders in the thoracic cavity. To treat pleural effusion, a physician conducts thoracentesis by carefully piercing the chest wall and entering...
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Knee Joint01:23

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The knee joint is the most complicated joint in the body. It consists of three articulations– two tibiofemoral and one patellofemoral. As is characteristic of synovial joints, the knee joint has a thin articular capsule that partially surrounds this joint cavity. Additionally, several ligaments, muscles, and cartilaginous structures support the movement of the knee.
A total of seven ligaments support the knee joint. The patellar ligament, which is also attached to the quadriceps femoris...
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Related Experiment Video

Updated: Sep 30, 2025

Knee Arthrocentesis in Adults
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Knee Arthrocentesis in Adults.

Arlene Tieng1, Giovanni Franchin2

  • 1Department of Medicine, BronxCare Health System; artieng@bronxleb.org.

Journal of Visualized Experiments : Jove
|March 14, 2022
PubMed
Summary
This summary is machine-generated.

Knee arthrocentesis, a procedure to remove synovial fluid, aids in diagnosing arthritis and relieving joint pressure. It is crucial for identifying infections like septic arthritis and guiding treatment for various knee effusions.

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Area of Science:

  • Orthopedic Surgery
  • Rheumatology
  • Diagnostic Procedures

Background:

  • Knee effusion requires accurate diagnosis for effective treatment.
  • Arthrocentesis is a key procedure for analyzing knee joint fluid.
  • Understanding the cause of knee effusions is vital for patient management.

Purpose of the Study:

  • To describe the diagnostic and therapeutic applications of knee arthrocentesis.
  • To highlight the importance of synovial fluid analysis in knee effusions.
  • To outline the procedure and considerations for knee arthrocentesis.

Main Methods:

  • Arthrocentesis involves needle insertion into the knee joint to aspirate synovial fluid.
  • Synovial fluid is analyzed for infection, inflammation, and crystals.
  • Procedure requires sterile technique, local anesthesia, and careful site selection.

Main Results:

  • Arthrocentesis can diagnose septic arthritis, crystal-induced arthritis (gout, pseudogout), and osteoarthritis.
  • Fluid aspiration reduces intra-articular pressure, alleviating pain and improving motion.
  • Analysis aids in differentiating causes of knee effusion, guiding treatment strategies.

Conclusions:

  • Knee arthrocentesis is a valuable diagnostic and therapeutic tool for knee effusions.
  • It is essential for identifying urgent conditions like septic arthritis.
  • While helpful, it should be combined with clinical evaluation and imaging for comprehensive diagnosis.