We tried to estimate the frequency of surgery for posthysterectomy vault prolapse. We contacted all 86 departments of gynecology in Austria and asked them about total number of hysterectomies and total number of operations for vault prolapse. We then calculated a percentage of patients undergoing surgery for posthysterectomy vault prolapse. Sixty-five of 86 public hospitals replied (response rate 76%) and reported a total of 7,645 hysterectomies and 577 operations for vault prolapse for the year 2005, giving a percentage of 7.16 for surgery for posthysterectomy vault prolapse. On the assumption that vault prolapse takes on the average 10 years to develop and that the number of hysterectomies decreased by 10% over 10 years, we calculated a modified frequency of 6.52%. We were able to calculate an estimation of the frequency for posthysterectomy vault prolapse requiring surgical repair between 6% and 8%.