Article

Accurate localisation of the hip joint centre is required to obtain accurate
kinematics, kinetics and musculoskeletal modelling results. Literature data
showed that conclusions drawn from synthetic data, adult normal subjects and
cerebral palsy children may vary markedly. This study investigated the
localisation accuracy of the hip joint centre against EOS. The EOS system allowed
us to register the hip joint centres with respect to the skin markers on standing
subjects. A comprehensive set of predictive and functional calibration techniques
were tested. For the functional calibration techniques, our results showed that
algorithm, range of motion and self-performance of the movement were factors
significantly affecting the results. Best results were obtained for comfortable
range and self-performance of the movement. The best method in this scenario was
the functional geometrical sphere fitting method which localised the hips 1.1cm
from the EOS reference in average and 100% of the time within 3 cm. Worst results
for functional calibration methods occurred when the movement was assisted with a
reduced range of movement. The best method in this scenario was the Harrington et
al. regression equations since it does not rely on a functional calibration
movement. Harrington et al. equations put the hips 1.7 cm from the EOS reference
in average and 97% of the time within 3 cm. We conclude that accurate
localisation of the hip joint centre is possible in gait analysis providing that
method to localise the hip joint centres are adapted to the population studied:
functional geometrical sphere fitting when hip calibration movements are not a
problem and Harrington et al. predictive equations otherwise.
CI - Copyright (c) 2014 Elsevier B.V. All rights reserved.

Langue : ANGLAIS