title: Pyogenic arthritis presenting as a ruptured popliteal cyst.
mesh_terms: D001170:Arthritis, Infectious / Q000150:complications*; D001172:Arthritis, Rheumatoid / Q000150:complications; D001442:Bacteroides Infections / Q000150:complications*; D006801:Humans; D007719:Knee Joint; D008297:Male; D008875:Middle Aged; D011183:Postoperative Complications; D012422:Rupture, Spontaneous; D013581:Synovial Cyst / Q000209:etiology*