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Adjusting a Traverse

Adjusting a Traverse

In the site survey of a four-sided traverse, internal angles are essential to ensure geometric accuracy. The survey revealed that the sum of the measured internal angles was 359 degrees and 48 minutes, which is 12 minutes less than the expected 360 degrees. This discrepancy signals an error likely arising from measurement inaccuracies during the fieldwork.To rectify this error, the adjustment process involved distributing the 12-minute shortfall equally across the four internal angles. By...

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Three-Dimensional Preoperative Virtual Planning in Derotational Proximal Femoral Osteotomy

Three-Dimensional Preoperative Virtual Planning in Derotational Proximal Femoral Osteotomy

Published on: February 17, 2023

Difference between 2 measurement methods of version angles of the acetabular component.

Noriyuki Arai¹, Shigeru Nakamura, Takashi Matsushita

¹Department of Orthopaedic Surgery, Teikyo University School of Medicine, Tokyo, Japan.

The Journal of Arthroplasty

|August 11, 2007

Summary

Measurements of acetabular component version angles (VAs) in total hip arthroplasty differ between radiographic methods. Surgeons should consider these differences when comparing VA data in clinical studies.

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Area of Science:

Orthopedic Surgery
Radiology
Biomedical Engineering

Background:

Accurate measurement of acetabular component version angles (VAs) is crucial for successful total hip arthroplasty (THA).
Different radiographic techniques may yield varying VA measurements, potentially impacting clinical interpretation and comparison.

Purpose of the Study:

To evaluate the relationship and quantify the differences between acetabular component VAs measured using two distinct radiographic methods.
To assess the reliability of these measurements in both clinical and model data.

Main Methods:

Comparison of VA measurements from anteroposterior (AP) hip radiographs (VAP) and cross-table lateral radiographs (VCL).
Analysis of data from 97 post-operative THA hips (clinical data) and 6 sawbone pelvic models.

Main Results:

A positive correlation was observed between VAP and VCL measurements in both clinical and model datasets.
Clinical data showed a mean difference of 5° ± 4.2° (VCL - VAP), while model data showed a negligible difference of -0.01° ± 0.32°.

Conclusions:

Significant discrepancies exist in VA measurements between AP and cross-table lateral radiographs in clinical THA cases.
These differences necessitate careful consideration when comparing VA data across studies employing different measurement methodologies.