Fig. 1

Images of Type I and Type IIa hips in preterm infants during the four screening sessions. A shows the Type I hip in a preterm infant on the first day after birth. B and C demonstrates the screenings at 7 and 42 days, respectively. D shows the 90-day screening, where the hip remains as Type I. E shows the Type IIa hip in a preterm infant on the first day after birth. F and G demonstrates the screenings at 7 and 42 days, respectively. H shows the 90-day screening, where the hip has transitioned to Type I