Abstract
In a group of 300 patients with definit or classical rheumatoid arthritis 26 patients (8.6%) with popliteal and 9 (3%) patients with true Baker's calf cysts were found. The diagnosis was proved by arthroscintigraphy and/or ultrasonography. In 6 patients the calf cysts disappeared after 1-3 lokal applications of 40-60 mg of triamcinolone acetonid in the homologous knee. A spontaneous infection was noted in Baker's cyst of one patient, a spontaneous synovial fistula in another, whereas in the third patient the operation was undertaken due to resistance to conservative treatment. In our view the direct punction of the Baker's cyst should be avoided because of raised liability to infection. When the operative treatment is performed the synovectomy of the ipsilateral knee should always be done at the same time. The early aspiration of the hydrops and proper treatment of the synovitis of the knee joint is the best prevention of the developement of Baker's cysts in rheumatoid arthritis.
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