Ans. is 'a' i.e., < 2 years Fracture shaft femur in infant and voung childreno It is published that upto one half of infants and young children who sustain femur fractures are victims of child abuse and child abuse occurs in 5(1 - 80% of children (< 2 years of age) with femoral fracture.o Other causes of fracture are osteogenesis imperfecta (blue sclera, hearing loss, multiple fracture), bone tumors (eosinophilic granuloma, aneurysmal bone cyst),o Fracture heals within 2 w eeks in infant and children upto 2 years of age.o Treatment depends upon the age of the patient: -Conservative : - It is the treatment of choice in children.0-2yeas: - Plaster spica or modified Bryant or Gallow's traction or pavllic harness (< 6 month of age).2-10years: - Split Russel traction10-15years: - 90-90deg femoral skeletal traction.SurgicalSurgery is done less commonly in children.It is indicated in older children when closed reduction by conservative treatment is not possible.Intramedullar titanium elastic nailing is the surgery of choice.