Related Experiment Video
Updated: Apr 2, 2026
In Vivo Quantification of Hip Arthrokinematics during Dynamic Weight-bearing Activities using Dual Fluoroscopy
Published on: July 2, 2021
Fluoroscopy-based tracking of femoral kinematics with statistical shape models
Marta Valenti1, Elena De Momi2, Weimin Yu3
1Department of Electronics, Information and Bioengineering, Politecnico di Milano, Via Colombo 40, 20133, Milan, Italy. marta.valenti@polimi.it.
Purpose:
Precise knee kinematics assessment helps to diagnose knee pathologies and to improve the design of customized prosthetic components. The first step in identifying knee kinematics is to assess the femoral motion in the anatomical frame. However, no work has been done on pathological femurs, whose shape can be highly different from healthy ones.
Methods:
We propose a new femoral tracking technique based on statistical shape models and two calibrated fluoroscopic images, taken at different flexion-extension angles. The cost function optimization is based on genetic algorithms, to avoid local minima. The proposed approach was evaluated on 3 sets of digitally reconstructed radiographic images of osteoarthritic patients.
Results:
It is found that using the estimated shape, rather than that calculated from CT, significantly reduces the pose accuracy, but still has reasonably good results (angle errors around 2[Formula: see text], translation around 1.5 mm).
