Posterior vaginal compartment repairs: Does vaginal vault (level I) fixation significantly improve the vaginal introital (level III) repair?

Abstract

Limited data exist associating vaginal vault and introital defects before and after posterior repairs (PR). We hypothesize: (i) a positive association between the size of vaginal vault and introital defects preoperatively; and (ii) a positive association between the reduction of these defects postoperatively if vault fixation (sacrospinous colpopexy-SSC) is used with the PR. In a cross-sectional study of 300 consecutive PRs, the following were measured pre- and immediately postoperatively: (i) from POP-Q: genital hiatus (GH-Level III); (ii) from PR-Q: perineal gap (PG-Level III), posterior vaginal vault descent (PVVD-Level I). The data for introital defects (GH, PG) were separated according to the need for vault fixation using a SSC due to a larger vaginal defect (PVVD over 5 cm). Mean (SD) preoperative GH and PG were both significantly larger in the SSC versus no SSC group: GH (3.73 [0.94] vs 3.36 [0.83] cm, P = 0.01); PG (2.91 [1.0] vs 2.61 [0.91] cm, P = 0.05). SSC performed with the PR (84%); not performed (16%) cases. The mean (SD) postoperative reduction in GH (antero-posterior) was significantly (29%-P = 0.002) greater-1.1 (0.69) cm (29.5%) in the SSC group and 0.77 (0.49) cm (22.9%) in the no SSC group. The decrease in the PG (transverse) was greater by 11% (0.05). Levels I and III defects are associated with PRs; preoperatively larger vaginal vault (PVVD over 5 cm) and larger introital defects (GH, PG). Postoperatively, vault fixation resulted in significantly greater reduction in the introital defects. Vaginal vault fixation (SSC) significantly improves the vaginal introital repair.