Rupture of the knee joint occurred in a patient with urethritis, conjunctivitis, and arthritis (Reiter's syndrome). The diagnosis had been suggested by the acute joint effusion, edema, warmth, tenderness, and pain in the calf; it was confirmed by arthrography. Differential considerations include a Baker's cyst and thrombophlebitis.
Weese WC, McCarty DJ. Spontaneous Rupture of the Knee Joint in Reiter's Syndrome. JAMA. 1969;208(5):825–827. doi:10.1001/jama.1969.03160050079006
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