Vaginal Adventitia Reserved and Anatomical Implant Technique of Transvaginal Mesh Procedure for Pelvic Organ Prolapse

After obtaining an institutional ethics approval (#2021833), the investigators retrospectively reviewed patients with Pelvic organ prolapse (POP) who underwent Transvaginal Mesh (TVM) in their hospital during June 2008 and December 2020. The goal of this observational study is to introduce the Vaginal Adventitia Reserved and Anatomical Implant Technique in Transvaginal mesh surgery, and to report long term efficacy and safety results of this technique. The main questions it aims to answer are: * How to reduce the potential risk of mesh-related complications when performing TVM? * How effective is the use of the Vaginal Adventitia Reserved and Anatomical Implant Technique when performing TVM? Participants will be asked to fill the Pelvic Floor Distress Inventory (PFDI-20) at final follow-up, and the Prosthesis/Graft Complication Classification Code was used to record the mesh-related complications.