Related Experiment Video
Updated: Jun 10, 2026
07:43
In Vivo Quantification of Hip Arthrokinematics during Dynamic Weight-bearing Activities using Dual Fluoroscopy
Published on: July 2, 2021
Dual mobility hip arthroplasty wear measurement: Experimental accuracy assessment using radiostereometric analysis
1Department of Orthopaedic and Trauma Surgery, Caen Côte de Nacre Teaching Hospital, Center, avenue de la Côte-de-Nacre, 14033 Caen cedex France. pineau-v@chu-caen.fr
Orthopaedics & Traumatology, Surgery & Research : OTSR
|July 27, 2010
Summary
Radiostereometric analysis (RSA) precisely measures dual mobility implant wear. This validated in vitro method offers excellent accuracy and reproducibility, establishing it as the reference for in vivo total hip prosthesis wear assessment.
Area of Science:
- Orthopedic Surgery
- Biomedical Engineering
- Radiology
Background:
- Dual mobility cups effectively prevent hip dislocations.
- Concerns exist regarding potential increased wear and osteolysis with dual mobility implants.
- Radiostereometric analysis (RSA) can quantify femoral head migration to assess polyethylene wear rate.
Purpose of the Study:
- To determine the precision of RSA for measuring femoral head migration in dual mobility implants.
- To evaluate the intra- and interobserver variability of RSA measurements.
- To validate a model-based RSA protocol for wear assessment.
Main Methods:
- A total hip prosthesis phantom with controlled polyethylene wear was used in a simulator.
- Model-based RSA was applied to radiostereometric films of liners with varying wear levels.
- Three blinded examiners with different experience levels performed repeated measurements, analyzed statistically.
Main Results:
- The RSA protocol demonstrated high precision (0.072mm) and accuracy (0.034mm).
- Excellent correlation was found between measured and true wear (CCC=0.9772).
- High intraobserver (ICC > 0.985) and interobserver (CCC > 0.971) reproducibility was achieved.
Conclusions:
- Quantifying wear is crucial for monitoring dual mobility implants.
- This in vitro study validates the model-based RSA method for wear measurement.
- Model-based RSA is proposed as the reference standard for in vivo total hip prosthesis wear assessment.
