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Related Concept Videos

Muscles of the Pelvic Floor and Perineum01:26

Muscles of the Pelvic Floor and Perineum

The muscles of the pelvic floor and perineum are crucial for supporting the pelvic organs, controlling continence, and aiding in sexual function, childbirth, and core stability. They are typically divided into the superficial perineal layer and the deep pelvic floor layer.
Perineal Layer
The perineum is a diamond-shaped area below the pelvic diaphragm, divided into an anterior urogenital triangle that contains the external genitals and a posterior anal triangle housing the anus. The urogenital...

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Related Experiment Video

Updated: Jul 8, 2026

Anogenital Distance and Perineal Measurements of the Pelvic Organ Prolapse (POP) Quantification System
03:49

Anogenital Distance and Perineal Measurements of the Pelvic Organ Prolapse (POP) Quantification System

Published on: September 20, 2018

The Reconstructive Pelvic Anatomy classification system : a valid and reliable classification system for pelvic

William J J Collins1,2, Daniel Franks2, Ian A Harris2,3

  • 1University of Sydney, Sydney, Australia.

Bone & Joint Open
|July 6, 2026
PubMed
Summary

A new Reconstructive Pelvic Anatomy (RPA) classification system was developed and validated for pelvic reconstruction. This system shows good reliability for communication, research, and surgical planning in complex cases.

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Published on: April 17, 2019

Area of Science:

  • Orthopaedic Surgery
  • Surgical Innovation
  • Anatomical Classification Systems

Background:

  • Pelvic reconstruction is complex, especially with bone loss, utilizing advanced techniques like 3D-printed prostheses.
  • Optimizing patient outcomes requires careful reconstructive planning.
  • A standardized classification system is needed for communication and research in pelvic reconstruction.

Purpose of the Study:

  • To develop the Reconstructive Pelvic Anatomy (RPA) classification system.
  • To assess the content and construct validity of the RPA system.
  • To evaluate the interobserver and intraobserver agreement of the RPA classification.

Main Methods:

  • The RPA classification system was developed by orthopaedic surgeons.
  • Content validity was assessed by 23 surgeons using the Item-Content Validity Index (I-CVI).
  • Construct validity and agreement were evaluated by applying the classification to 20 cases, with interobserver and intraobserver reliability assessed using the kappa statistic.

Main Results:

  • All domains demonstrated strong content validity (I-CVI > 0.78).
  • Moderate agreement was found for construct validity (kappa = 0.6).
  • Interobserver agreement was moderate overall (kappa = 0.54), with substantial agreement for most domains (kappa = 0.73–0.82). Intraobserver agreement was substantial to almost perfect (kappa = 0.76–0.84).

Conclusions:

  • The RPA classification system is a valid and reliable tool for pelvic reconstruction.
  • The system demonstrates good content and construct validity.
  • The RPA classification can enhance communication, surgical planning, and research in pelvic reconstruction.