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New radiographic index for evaluating acetabular version.

Hiroshi Koyama¹, Hironobu Hoshino, Daisuke Suzuki

¹Department of Orthopaedic Surgery, Hamamatsu University School of Medicine, 1-20-1 Handayama, Higashi-Ku, Hamamatsu, 431-3192, Japan. hiromania27@hotmail.com

Clinical Orthopaedics and Related Research

|December 25, 2012

Summary

A new quantitative index, the p/a ratio, was developed to assess acetabular version using hip radiographs. This simple measurement correlates with anatomic acetabular version and aids in identifying retroversion.

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In Vivo Quantification of Hip Arthrokinematics during Dynamic Weight-bearing Activities using Dual Fluoroscopy

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Published on: July 2, 2021

Area of Science:

Orthopedic surgery
Radiology
Hip biomechanics

Background:

Qualitative radiographic signs for acetabular retroversion lack quantitative precision.
A quantitative method for acetabular version assessment is needed for research and clinical diagnosis of hip disorders.

Purpose of the Study:

To develop and validate a novel quantitative index, the p/a ratio, for assessing acetabular version.
To compare the p/a ratio with existing radiographic signs of acetabular retroversion.
To evaluate the relationship between the p/a ratio and anatomic acetabular version.

Main Methods:

The p/a ratio was calculated from plain hip AP radiographs by dividing the posterior wall (p) to anterior wall (a) distance.
Measurements were taken on 185 hip radiographs and compared with qualitative retroversion signs.
The relationship between the p/a ratio and anatomic anteversion was assessed using 62 hip CT scans.

Main Results:

The average p/a ratio was 2.05.
A p/a ratio greater than 2.05 was associated with negative qualitative retroversion signs.
A strong correlation (r = 0.84) was found between the p/a ratio and central acetabular anteversion.

Conclusions:

The p/a ratio offers a simple, quantitative method for assessing acetabular version.
This index can be reliably measured using standard AP hip radiographs.
The p/a ratio shows promise for research and clinical applications in hip disorder evaluation.