[The knee joint]

The knee is very important in the treatment of rheumatic diseases. Differentiating between the indications for different forms of therapy is dependent upon knowledge of the prospects for success. Synovectomy, preventive and palliative procedure, is the most important joint-saving measure, as confirmed by the long-term results presented here. Synoviorthese and arthroscopic operative procedures are alternatives and have expanded the spectrum. However, their long-term effectiveness has not yet been proved. Rheumatic, recurring synovitis has not yet been defined satisfactorily. Additional soft tissue operations should always be included in preoperative planning and determine the form of therapy. Alloarthroplasty of the knee is the foremost reconstructive measure, and excellent long-term results have already been achieved in some cases. It should be remembered, however, that modifications of individual models occasionally have a considerable influence on the results. Particularly for rheumatic knee joint deterioration, knee prosthesis models that guarantee long-term success should be given preference if the time and effort expended are justifiable. Continuous passive mobilization seems to be the most valuable postoperative measure.