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Synovial fluid, also called synovia, is a viscous, non-Newtonian fluid found in the cavities of synovial joints. With its egg white –like consistency, [ 1 ] the principal role of synovial fluid is to reduce friction between the articular cartilage of synovial joints during movement. [ 2 ]
Knee effusion, informally known as water on the knee, occurs when excess synovial fluid accumulates in or around the knee joint. It has many common causes, including arthritis , injury to the ligaments or meniscus , or fluid collecting in the bursa , a condition known as prepatellar bursitis .
Patients with a fever, suspected flare of existing arthritis, or unknown cause of joint effusion should undergo arthrocentesis with synovial fluid analysis. Samples of synovial fluid can be analyzed for gross appearance, presence of crystals, white blood cell count with differential, red blood cell count, and bacterial culture. Normal synovial ...
Synovial fluid examination [3] [4]; Type WBC (per mm 3) % neutrophils Viscosity Appearance Normal <200: 0: High: Transparent Osteoarthritis <5000 <25: High: Clear yellow Trauma <10,000
Arthrocentesis, or removing synovial fluid from the affected joint, is performed to test the synovial fluid for the calcium pyrophosphate crystals that are present in CPPD. When stained with H&E stain , calcium pyrophosphate crystals appears deeply blue (" basophilic ").
Synovial fluid analysis is another method to diagnose Hemarthrosis. It involves a small needle being inserted into the joint to draw the fluid. [6] Reddish-colored hue of the sample is an indication of the blood being present. Imaging tests are normally done.
Analysis of a sample of synovial fluid to look for signs of an infection (infectious arthritis) or uric acid crystals (gout) Imaging tests, such as X-rays or MRI scans, to evaluate the condition ...
Synovial fluid examination [1] [2]; Type WBC (per mm 3) % neutrophils Viscosity Appearance Normal <200: 0: High: Transparent Osteoarthritis <5000 <25: High: Clear yellow Trauma <10,000