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Related Experiment Video

Updated: Jul 10, 2026

Individualized Stem-positioning in Calcar-guided Short-stem Total Hip Arthroplasty

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Published on: February 27, 2018

Precision, Accuracy, and Observer Reliability of Computed Tomography-Based Radiostereometric Analysis in Measuring

Vasileios Angelomenos^1,2, Maziar Mohaddes^1,3,4, Bita Shareghi^1,5

¹Department of Orthopaedics, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.

Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society

|January 18, 2026

Summary

This summary is machine-generated.

CT-based radiostereometric analysis (CT-RSA) offers precise and accurate measurements of femoral stem migration in total hip arthroplasty (THA). This method demonstrates excellent observer reliability, supporting its use in THA research.

Keywords:

CT CT‐RSA accuracy computed tomography migration precision radiostereometric analysis reliability total hip arthroplasty

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Last Updated: Jul 10, 2026

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Published on: July 2, 2021

Area of Science:

Orthopedics
Medical Imaging
Biomechanical Engineering

Background:

Total hip arthroplasty (THA) requires accurate assessment of implant stability.
Micromotion of femoral stems can indicate loosening or failure.
Current measurement techniques may have limitations in precision and reliability.

Purpose of the Study:

To evaluate the precision, accuracy, and observer reliability of CT-based radiostereometric analysis (CT-RSA).
To assess CT-RSA's capability for measuring femoral stem translation in THA.
To determine the suitability of CT-RSA for early migration measurement in THA research.

Main Methods:

An in vitro study using a cementless femoral stem implanted in a synthetic femur.
Controlled translations applied to the stem along orthogonal axes, generating 90 CT datasets.
Precision calculated from repeated scans, accuracy from comparison with micrometer readings, and reliability assessed by two blinded observers using intraclass correlation coefficients (ICC).

Main Results:

CT-RSA achieved sub-tenth-millimeter precision (0.06-0.08 mm on native axes, 0.06-0.07 mm on transformed axes).
Accuracy ranged from 0.09-0.13 mm on native axes and 0.03-0.14 mm on transformed axes.
Excellent intraobserver (mean ICC 0.99) and interobserver (mean ICC 0.91-0.98) reliability was observed.

Conclusions:

CT-RSA demonstrates high precision and accuracy for measuring femoral stem translation in THA.
The method exhibits excellent observer agreement, making it reliable for research.
CT-RSA is a viable alternative for early migration assessment in THA, pending clinical validation.