A reference method for the evaluation of femoral head joint center location technique based on external markers.
Accurate localization of joint centers is essential in movement analysis. However, joint centers cannot be directly palpated and alternative methods must be used. To assess the relative merits of these methods, a medical image based reference should be used. The EOS(®) system, a new low dose bi-planar X-rays imaging technique may be considered. The aim of this study was to evaluate the accuracy of hip joint center (HJC) localization using the EOS(®) system. Seventeen healthy young adults participated in the study. Femoral heads and pelvic external markers were localized using the EOS(®) system and the HJCs were expressed in the movement analysis coordinate system. Results showed that external marker localization was reliable within 0.15 mm for trained assessors. Mean accuracy for HJC localization was 2.9 mm (SD: 1.3, max: 6.2). The EOS based method therefore appeared reliable and may be used for femoral head localization or as a reference to assess the accuracy of other methods for HJC localization.
Arts et Metiers ParisTech, LBM, 151 bd de l'hopital, 75013 Paris, France. Electronic address: helene.pillet@ensam.eu.
Hélène
H
Pillet
Morgan
M
Sangeux
Jérôme
J
Hausselle
Rami
R
El Rachkidi
Wafa
W
Skalli
D000293:Adolescent; D000328:Adult; D059925:Anatomic Landmarks / Q000000981:diagnostic imaging*; D001696:Biomechanical Phenomena; D005260:Female; D005270:Femur Head / Q000000981:diagnostic imaging*; D005684:Gait / Q000502:physiology; D006621:Hip Joint / Q000000981:diagnostic imaging*; D006801:Humans; D008297:Male; D010384:Pelvic Bones; D011859:Radiography; D055815:Young Adult
Biomechanics; Biplanar X-rays; EOS; Gait analysis; Joint center