title: Reliability of a new method for evaluating femoral stem positioning after total hip arthroplasty based on stereoradiographic 3D reconstruction.
abstract: The goal of this study was to validate a new method for determining femoral stem positioning based on 3D models derived from the EOS biplanar system. Independents observers measured stem anteversion and femoral offset using CT scan and EOS system of 28 femoral stems implanted in composite femurs. In parallel, the same parameters were measured on biplanar lower limb radiographs acquired from 30 patients who had undergone total hip arthroplasty. CT scanner and biplanar X-ray measurements on composite femurs were highly correlated: 0.94 for femoral offset (P < 0.01), 0.98 for stem anteversion (P < 0.01). The inter and intra-observer reproducibility when measuring composite bones was excellent with both imaging modalities as when measuring femoral stem positioning in patients with the biplanar X-ray system.
authors.affiliation: Clinique Arago, Service de Chirurgie Orthopédique Paris, France.
authors.forename: Benjamin
authors.initials: B
authors.lastname: Guenoun
authors.affiliation: Service de Chirurgie Orthopédique et Traumatologique - Groupe Hospitalier Cochin - Port-Royal (AP-HP), Paris, France.
authors.forename: Firass
authors.initials: F
authors.lastname: El Hajj
authors.affiliation: Service de Chirurgie Orthopédique et Traumatologique - Groupe Hospitalier Cochin - Port-Royal (AP-HP), Paris, France.
authors.forename: David
authors.initials: D
authors.lastname: Biau
authors.affiliation: Service de Chirurgie Orthopédique et Traumatologique - Groupe Hospitalier Cochin - Port-Royal (AP-HP), Paris, France.
authors.forename: Philippe
authors.initials: P
authors.lastname: Anract
authors.affiliation: Service de Chirurgie Orthopédique et Traumatologique - Groupe Hospitalier Cochin - Port-Royal (AP-HP), Paris, France.
authors.forename: Jean-Pierre
authors.initials: JP
authors.lastname: Courpied
mesh_terms: D000328:Adult; D000368:Aged; D019644:Arthroplasty, Replacement, Hip / Q000379:methods*; D001672:Biocompatible Materials; D002516:Ceramics; D005260:Female; D005269:Femur / Q000000981:diagnostic imaging* / Q000601:surgery*; D005272:Femur Neck / Q000000981:diagnostic imaging; D006622:Hip Prosthesis; D006801:Humans; D021621:Imaging, Three-Dimensional; D008297:Male; D008875:Middle Aged; D008953:Models, Anatomic; D019919:Prosthesis Implantation; D011857:Radiographic Image Interpretation, Computer-Assisted; D015203:Reproducibility of Results; D012189:Retrospective Studies; D014057:Tomography, X-Ray Computed
chemical_list: D001672:Biocompatible Materials
keywords: EOS biplanar X-ray system; analysis of radiographs; femur X-rays; reproducibility of results; total hip arthroplasty