Six weeks after birth, an infant is found to have developmental dysplasia of the hip. The nurse explains the benefits of early treatment to the parents. What rationale for the immediate institution of corrective measures will be included in teaching?

Choice A rationale While prolonged untreated developmental dysplasia of the hip (DDH) can lead to gait disturbances, delayed mobility is not the primary or most urgent rationale for immediate intervention in a 6-week-old. The critical period for bony remodeling is infancy because the hip structures are highly pliable. Postponement risks irreversible changes, making the focus on anatomical correction over functional delay. Choice B rationale Traction, such as Bryant or Buck, is occasionally used, but it is not the universally preferred or only treatment for DDH; the Pavlik harness is most common in infants. The effectiveness of traction is not solely dependent on being used before toddlerhood, but rather on the degree of subluxation and the ability to maintain reduction, which is easiest in the first few months. Choice C rationale The convenience of managing an infant versus a toddler in a spica cast is a practical consideration for the parents and staff, but it is secondary to the physiological goal of treatment. The primary rationale must focus on the best anatomical and long-term functional outcome for the developing hip, not ease of care. Choice D rationale In the first few months of life, the hip socket (acetabulum) and femoral head are composed mainly of soft cartilage, which is highly responsive to external forces. Utilizing a Pavlik harness or other early corrective measures leverages this plasticity to guide the femoral head into the acetabulum, promoting proper deepening and molding of the acetabulum for a stable, functional joint.