title: Visualization of femorotibial contact in total knee arthroplasty using X-ray fluoroscopy.
abstract: The purpose of this study was to build a visualization technique of the femorotibial contact in fixed-bearing total knee arthroplasty (TKA) using X-ray fluoroscopy, and to apply this technique to a TKA patient during dynamic motion. In vivo kinametcis of the metallic knee implant was determined using a 2D/3D registration technique, which uses computer assisted design (CAD) model of the implant to estimate the 3D pose of radiopaque metallic femoral and tibial components from a single-plane fluoroscopic image. In fixed-bearing TKA, a 3D pose of radiolucent tibial polyethylene insert can be determined from the estimated pose of the tibial component. To visualize femorotibial contact, the proximity between surfaces of femoral component and tibial insert was calculated, and mapped onto the insert surface model. For the clinical application, dynamic states of contact on the tibial insert were observed including axial rotation and unilateral loading during knee flexion, and post-cam contact of posterior stabilized TKA. The present technique provided us new information and enabled us to better understand the relationship between in vivo knee kinematics and articular shape of the implant.
authors.affiliation: Department of Medical Robotics and Image Sciences, Osaka University, Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka 565-0871, Japan. yamazaki@image.med.osaka-u.ac.jp
authors.forename: Takaharu
authors.initials: T
authors.lastname: Yamazaki
authors.forename: Tetsu
authors.initials: T
authors.lastname: Watanabe
authors.forename: Yoshikazu
authors.initials: Y
authors.lastname: Nakajima
authors.forename: Kazuomi
authors.initials: K
authors.lastname: Sugamoto
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Tomita
authors.forename: Daisuke
authors.initials: D
authors.lastname: Maeda
authors.forename: Wataru
authors.initials: W
authors.lastname: Sahara
authors.forename: Hideki
authors.initials: H
authors.lastname: Yoshikawa
authors.forename: Shinichi
authors.initials: S
authors.lastname: Tamura
mesh_terms: D019645:Arthroplasty, Replacement, Knee; D017076:Computer-Aided Design; D005269:Femur / Q000473:pathology*; D005471:Fluoroscopy; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods; D021621:Imaging, Three-Dimensional; D007720:Knee Prosthesis; D008954:Models, Biological; D009068:Movement; D020959:Polyethylene; D011474:Prosthesis Design; D015641:Radiography, Interventional; D012399:Rotation; D013499:Surface Properties; D013977:Tibia / Q000473:pathology*; D014584:User-Computer Interface; D016474:Weight-Bearing
chemical_list: D020959:Polyethylene