title: In vivo comparison of knee kinematics before and after high-flexion posterior cruciate-retaining total knee arthroplasty.
abstract: The objectives of this study were to compare preoperative and postoperative knee kinematics for subjects implanted with flexion-enhanced posterior cruciate-retaining total knee arthroplasty during deep flexion and to examine flexion performance of the prosthesis design. Three-dimensional kinematics was analyzed by fluoroscopic examinations of subjects using a single-plane model-image registration technique. Preoperatively, knee kinematics demonstrated small posterior femoral translation and limited axial rotation. These motions differed significantly from patterns previously reported for normal knees. Postoperatively, flexion performance was maintained, averaging 130 degrees , and kinematic patterns were similar to preoperative patterns. Although total knee arthroplasty can reduce pain and maintain functional performance, it appears that the characteristics of varus arthritic knee mechanics persist after arthroplasty.
authors.affiliation: Department of Orthopedic Surgery, Hyogo Rehabilitation Center Hospital, Hyogo, Japan.
authors.forename: Atsushi
authors.initials: A
authors.lastname: Kitagawa
authors.forename: Nobuhiro
authors.initials: N
authors.lastname: Tsumura
authors.forename: Takaaki
authors.initials: T
authors.lastname: Chin
authors.forename: Kazuyoshi
authors.initials: K
authors.lastname: Gamada
authors.forename: Scott A
authors.initials: SA
authors.lastname: Banks
authors.forename: Masahiro
authors.initials: M
authors.lastname: Kurosaka
mesh_terms: D000368:Aged; D019645:Arthroplasty, Replacement, Knee / Q000379:methods; D001696:Biomechanical Phenomena; D005260:Female; D005471:Fluoroscopy; D006801:Humans; D007091:Image Processing, Computer-Assisted; D007719:Knee Joint / Q000503:physiopathology*; D007720:Knee Prosthesis; D008297:Male; D020370:Osteoarthritis, Knee / Q000503:physiopathology / Q000601:surgery; D016119:Posterior Cruciate Ligament; D016059:Range of Motion, Articular