title: Fast 3D reconstruction of the lower limb using a parametric model and statistical inferences and clinical measurements calculation from biplanar X-rays.
abstract: In clinical routine, lower limb analysis relies on conventional X-ray (2D view) or computerised tomography (CT) Scan (lying position). However, these methods do not allow 3D analysis in standing position. The aim of this study is to propose a fast and accurate 3D-reconstruction-method based on parametric models and statistical inferences from biplanar X-rays with clinical measurements' (CM) assessment in standing position for a clinical routine use. For the reproducibility study, the 95% CI was under 2.7° for all lower limbs' angular measurements except for tibial torsion, femoral torsion and tibiofemoral rotation ( < 5°). The 95% CI were under 2.5 mm for lower limbs' lengths and 1.5 to 3° for the pelvis' CM. Comparisons between X-rays and CT-scan based 3D shapes in vitro showed mean differences of 1.0 mm (95% CI = 2.4 mm). Comparisons of 2D lower limbs' and 3D pelvis' CM between standing 'Shifted-Feet' and 'Non-Shifted-Feet' position showed means differences of 0.0 to 1.4°. Significant differences were found only for pelvic obliquity and rotation. The reconstruction time was about 5 min.
authors.affiliation: Arts et Métiers ParisTech, CNRS, LBM, Paris, France. yasmina.chaibi@gmail.com
authors.forename: Y
authors.initials: Y
authors.lastname: Chaibi
authors.forename: T
authors.initials: T
authors.lastname: Cresson
authors.forename: B
authors.initials: B
authors.lastname: Aubert
authors.forename: J
authors.initials: J
authors.lastname: Hausselle
authors.forename: P
authors.initials: P
authors.lastname: Neyret
authors.forename: O
authors.initials: O
authors.lastname: Hauger
authors.forename: J A
authors.initials: JA
authors.lastname: de Guise
authors.forename: W
authors.initials: W
authors.lastname: Skalli
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000379:methods* / Q000706:statistics & numerical data; D035002:Lower Extremity / Q000033:anatomy & histology* / Q000000981:diagnostic imaging*; D008297:Male; D008875:Middle Aged; D008953:Models, Anatomic; D015233:Models, Statistical; D011187:Posture; D011857:Radiographic Image Interpretation, Computer-Assisted / Q000379:methods; D015203:Reproducibility of Results; D012399:Rotation; D055815:Young Adult