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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 .
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
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
The knee bursae are the fluid-filled sacs and synovial pockets that surround and sometimes communicate with the knee joint cavity. The bursae are thin-walled, and filled with synovial fluid . They represent the weak point of the joint, but also provide enlargements to the joint space. [ 1 ]
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 ...
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 cavitation has some evidence to support it. [9] When a spinal manipulation is performed, the applied force separates the articular surfaces of a fully encapsulated synovial joint, which in turn creates a reduction in pressure within the joint cavity.