has part has part characteristic of has modifier Inferior pubic ramus hypoplasia The pubis is the anterior part of the hip bone and forms the anterior and inferior borders of the obturator foramen (the obturator foramen is the opening between the ischium and pubic bones). It is divisible into a body, a superior and an inferior ramus. Underdevelopment of the lower branch of the pubis bone (inferior pubic ramus). Hypoplastic pubic ramus abnormal hypoplastic inferior pubic ramus