&chief_complaint=Pain and swelling of the knee

&phys_exam=Tenderness of the knee with effusion

&cor_dif=Osteoarthritis of the knee,Lyme arthritis,Pigmented Villonodular Synovitis,Gout,Pseudogout,Infection,Meniscal tear,

&incor_dif=Anserine bursitis,Complex Regional Pain Syndrome,

&review=differential diagnosis of Monoarthritis