Joint Effusion -- Part Of A Knee
Diagnosis
In general, the word "effusion" means swelling. The
swelling is caused by an increased amount of synovial fluid. (source)
The synovial fluid is "a
clear viscous, slightly alkaline fluid present in healthy joints but whose exact
composition, viscosity, volume and colour vary somewhat from joint to joint. The
synovial fluid aids in nutrition of the adjacent cartilage and disc and provides
lubrication to joint surfaces. " (source)
There is an MRI image
showing joint effusion described HERE, and displayed
HERE.
Source
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a clear viscous, slightly alkaline fluid present in
healthy joints but whose exact composition, viscosity, volume and
colour vary somewhat from joint to joint. The synovial fluid aids in
nutrition of the adjacent cartilage and disc and provides lubrication
to joint surfaces.
In crystal deposition diseases, crystals of
various composition may be found in the synovial fluid. In some cases
acute and chronic inflammatory changes may occur. Similarly,
particles, cell fragments, fibrous tissue and microorganisms may also
occur as a consequence of wear and tear on the articular surface.
Subchondral cysts may form as a result of
intrusion of synovial fluid into subchondral bone in
osteoarthritis.
In
lipohaemarthrosis a haemorrhagic effusion with fat droplets and,
sometimes, spicules of bone marrow may occur and is usually a reliable
indicator of fracture, but may also be seen in some patients with
significant cartilage or ligament injury.
DR
The Encyclopaedia of
Medical Imaging Volume III:1
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Medcyclopaedia - The complete online version of
The Encyclopaedia of Medical Imaging by NICER |
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Provided by Amersham Health |
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www.amershamhealth.com | www.medcyclopaedia.com |
Image T: Lateral radiograph of
the knee shows subtle soft tissue masses of increased density (arrows)
representing hemosiderin-laden synovium and prominent swelling in the region of
the suprapatellar bursa consistent with a large effusion. (source)
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