[Local joint treatment in chronic polyarthritis: intra-articular corticosteroids and radioactive isotopes].

Intrasynovial injection of corticosteroids is currently one of the routine measures in the treatment of patients with rheumatoid arthritis. Crystalline corticosteroid suspensions have proved their value and are effective for approximately one to three weeks. One or two injections can control synovitis for prolonged periods of time. Special attention has to be given to impeccable technique of instillation. However, it must be kept in mind that, within the overall management of rheumatoid arthritis, the intra-articular injection of corticosteroids is a local, palliative and temporary measure. The intrasynovial instillation of radionuclides is used only in selected cases. Therapy of the knee joint is mainly performed with Yttrium-90, less frequently, the interphalangeal joints are treated with Erbium-169. Costs and radiation exposure are low, but a favourable result is only achieved in slightly more than 50 per cent of cases. This review provides a synopsis of the basic concepts and practical applications of intrasynovial corticosteroid and radioisotope injection therapy.