Is treatment termination safe in developmental dysplasia of the hip following ultrasonographic normalization?

摘要

Alpha (α) and beta (β) angles are measured in the coronal section view on hip ultrasonography. These angles take into account acetabulum ossification seen on ultrasonography and it is accepted that the hip would not deteriorate after ultrasonographic normalization.[1] In daily practice, the treatment for developmental dysplasia of the hip (DDH) is terminated, when an α angle of ≥60 degrees (ultrasonographic normalization) is obtained. It is well known that hip ultrasonography shows ossification in soft tissues earlier than radiography.