I went for my two weeks postpartum check up ,when i asked my ob about the failed vbac,she told me for some women the pelvis is narrow and makes the baby's head stuck on the ischial spine or the pubis symphysis and those women cannot deliver their baby vaginally.she told me that my ischial spine is narrow that got the baby to get stuck on it at -1 station.she also told me that in olden days when women with this problem died in labour and nowadays c/s helps as life saver for those women ..she also told me that it wasnt my fault for the pelvis to be narrow.i have a doubt that what is the average space between the ischial spines in normal woen and for those which is narrow..