Patients with history of chronic disease with concurrent<unk>  arthritis can be misdiagnosed as acute flareup of underlying chronic disease which often delays the treatment for<unk>  arthritis. So, patients with acute flare of one or two new inflamed joints with underlying chronic joint diseases or with another connective tissue disease, it should be assumed that the joint is<unk>  until proven otherwise, should always rule out concurrent<unk>  arthritis with appropriate diagnostic studies. In patients with acute effusion of unknown etiology, might have concurrent crystal-induced arthritis and<unk>  arthritis. So, the synovial fluid should always be cultured and examined for crystals in the evaluation of an acute effusion.
Septic arthritis laboratory findings
Reactive arthritis laboratory findings
Bursitis laboratory findings
Osteoarthritis laboratory findings
Osteomyelitis laboratory findings
Athlete's foot laboratory findings
Septic arthritis physical examination
Polymyalgia rheumatica laboratory findings