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Test Findings

Knee Effusion



    • Look For

    • Fluid in the suprapatellar pouch
    • Fluid in Hoffa’s triangle (anteriorly, between the femur and tibia)
    • Separation of the anterior fat pads of the knee
    • Causes of Knee Effusion

    • Trauma - ligament tear, menisceal tear, intra-articular fracture, patellar dislocation
    • Arthritis - osteoarthritis, psoriatic arthritis, reactive arthritis, IBD-related arthritis, gout, pseudogout
    • Infection - septic arthritis, tuberculosis, Lyme disease, syphilis
    • Malignancy - osteosarcoma
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