Related Experiment Video
Updated: Jul 21, 2025
07:43
In Vivo Quantification of Hip Arthrokinematics during Dynamic Weight-bearing Activities using Dual Fluoroscopy
Published on: July 2, 2021
3.1K
CT-based radiostereometric analysis for assessing midfoot kinematics: precision compared with marker-based
Magnus Poulsen1, Are H Stødle2, Lars Nordsletten3
1Division of Orthopaedic Surgery, Oslo University Hospital Ullevål, Oslo. japoul@ous-hf.no.
Acta Orthopaedica
|July 26, 2023
Summary
A new computed tomography-based radiostereometric analysis (CT-RSA) precisely measures in vivo midfoot motion. This non-invasive CT-RSA technique offers comparable or better precision than traditional marker-based radiostereometry (RSA).
Area of Science:
- Orthopedics
- Biomechanics
- Medical Imaging
Background:
- Evaluating 3-dimensional midfoot motion is clinically challenging.
- Traditional methods for assessing midfoot kinematics lack precision.
- In vivo analysis of midfoot motion requires advanced imaging techniques.
Purpose of the Study:
- To introduce and validate a novel computed tomography-based radiostereometric analysis (CT-RSA) technique.
- To assess the in vivo midfoot kinematics during single-leg stance.
- To compare the precision of CT-RSA with conventional marker-based radiostereometry (RSA).
Main Methods:
- Eight patients underwent bilateral non- and full-weight-bearing CT scans of the midfoot.
- 1st tarsometatarsal motion was analyzed using CT-RSA with surface-registration.
- Precision was evaluated by comparing CT-RSA (bone/marker registration) with marker-based RSA and intrasegmental CT-RSA.
Main Results:
- Under load, the 1st tarsometatarsal joint showed primary M1 dorsiflexion (1.4°), adduction (1.4°), and dorsal translation (1.1 mm).
- CT-RSA precision ranged from 0.3-0.7 mm (translation) and 0.6-1.6° (rotation).
- Intrasegmental CT-RSA demonstrated higher precision (0.1-0.2 mm translation, 0.4-0.5° rotation).
Conclusions:
- CT-RSA is a valid and precise method for measuring midfoot kinematics.
- The technique provides non-invasive in vivo assessment of midfoot motion.
- CT-RSA offers comparable or superior precision to conventional RSA.
