Facet joints are where certain bones fit together such as in the vertebral column. An effusion is escape of fluid into a part or tissue, and bilateral of course means on both sides. Bilateral facet joint effusion indicates fluid being released on both sides of the vertebrae.
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The joints in the back are called facet joints. Each vertebra has two sets of facet joints. One pair faces upward (superior articular facet) and one downward (inferior articular facet). There is one joint on each side (right and left). Facet joints are hinge-like and link vertebrae together. They are located at the back of the spine (posterior).
Joint effusion
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Degenerative joint disease (osteoarthritis)
Symptoms of joint effusion is usually caused by arthritis, gout, rheumatoid arthritis, septic arthritis, osteoarthritis, ankylosing spondylitis, and inflammatory arthritis.
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Hypertrophic facet joint is where the joint becomes enlarged as a result of degeneration. The joints are connected and impact the spinal vertebrae.
Facet hypertrophy is an enlargement of the facet and ligament joint. Nerves in the spine can come under pressure if it increases.
Facet arthrosis is the inflammation of the facet joint. Humans have 25 of these going down the spine. As the body ages, the spaces between the joint are less resilient and medical or surgical intervention can become necessary.
Fluid build up above the knee cap
fluid inside the knee joint
Trauma......was there a fall or sports injury?.....If so possible meniscus tear......Trauma to a knee can cause both...