If both the ala of the sacral bone are absent, pelvis is called as:
Ans. is b, i.e. Robert pelvisRef. Dutta Obs. 9/e, p 326If one ala is absent-pelvis is called Naegle's pelvis.If both ala of succumb are absent-pelvis is called as Robert's pelvis.Both are varieties of contracted pelvis and in both cesarean section is done.
Naegele pelvis
Robert pelvis
Triradiate pelvis
Rachitic pelvis
Fetal Skull and Maternal Pelvis