In assessing an infant for developmental dysplasia of the hip, the nurse practitioner places the infant supine, flexes the knees by holding the thumbs on the inner midthighs, with fingers outside on the hips touching the greater trochanters, stabilizes one hip, and abducts and gently pulls anteriorly on the other thigh. if this external rotation feels smooth with no sound present, there is no hip dislocation. This is?
