[Experiences in the treatment of rheumatoid arthritis with 90-yttrium-silicate (author's transl)].

In 29 patients suffering from rheumatoid arthritis 90-Yttrium-silicate was instillated 48 times into the knee. An improvement was seen in 41 cases. The success lasted in 3 of 10 so far observed cases more than one year. No side effects were seen. Less than 1 p.c. of the instillated substance was leaving the joint.