Acute rheumatic fever
Developmental dysplasia of hip
Femur fracture
Juvenile idiopathic<unk> 
Legg-Calve-Perthes disease<unk> (peds)
Lyme disease<unk> 
Slipped capital femoral epiphysis
Transient (toxic) synovitis
Osteosarcoma
Lyme disease<unk>
Septic arthritis of the hip 
Acute rheumatic fever
Hip bursitis
Developmental dysplasia of hip
Avascular necrosis of hip
Femur fracture
Lens dislocation
Juvenile idiopathic arthritis