Joint Effusion
A joint effusion means extra fluid has built up inside a joint space.
When to get help quickly: Urgent review is more important if the joint is hot, very painful, red, or the person also has fever because infection may need to be ruled out quickly.
Common symptoms
Common symptoms include joint swelling, stiffness, pain, reduced movement, and a feeling of pressure inside the joint.
When imaging helps
Imaging helps confirm the fluid, look for arthritis, injury, infection, or inflammation, and guide aspiration when needed.
What radiology does
Ultrasound, X-ray, or MRI may help show the fluid and whether arthritis, injury, or infection is contributing.
What usually happens next
Treatment depends on the cause and may include observation, aspiration, medicines, or orthopedic or rheumatology care.
Seen this on your report?
Your doctor or the radiologist who wrote it can tell you what it means for you.
Related scan guides
- Knee MRIA Knee MRI is a specialized scan focusing on the complex hinge joint of the knee. It is highly effective for diagnosing sports injuries, identifying the cause of chronic joint pain, and evaluating damage to cartilage and ligaments.
- Musculoskeletal (MSK) UltrasoundA Musculoskeletal (MSK) Ultrasound provides a real-time, moving picture of your muscles, tendons, ligaments, and joints. Unlike a static X-ray, this test allows your doctor to see how your internal structures move and stretch while you actively use them.