[Questionable gonarthritis--assessment and therapy].

The differential diagnosis of gonarthritis is widespread due to the fact that the knee participates in diseases ranging from infections to autoimmunopathies and metabolic disorders. The analysis of the synovial fluid provides important information and has to be performed without delay, if septic arthritis is suspected. Characteristics, symptoms and signs of underlying diseases help in the diagnostic work-up. Whereas radiologic examination is primarily done to document the evolution of the process, ultrasonography may add substantial morphological information. Therapy is based on drug treatment and physical measures. The primary goals of physiotherapy are analgesia and rehabilitation.