Trauma<unk> Acute Rheumatic Fever
Reactive Arthritis (Poststreptococcal)
Gonococcal arthritis
Lyme disease
Sickle cell crisis
Henoch-Schonlein Purpura (HSP)
Legg Calve Perthes Disease
Slipped Capital Femoral Epiphysis (SCFE)
Osteomyelitis
Juvenile Idiopathic Arthritis
Transient (Toxic) Synovitis (Hip)
Hemophilia
Osgood Schlatter Disease
Septic arthritis 
Trauma
Monoarticular arthritis
Septic arthritis
Reactive arthritis
Acute Rheumatic Fever
Septic bursitis
Reactive Arthritis 