title: Significant effect of the posterior tibial slope on the weight-bearing, midflexion in vivo kinematics after cruciate-retaining total knee arthroplasty.
abstract: The purpose of the present study was to compare weight bearing (WB) and non-WB conditions, and to evaluate the effect of the posterior tibial slope (PTS) on the in vivo kinematics of 21 knees after posterior cruciate ligament-retaining total knee arthroplasty during midflexion using 2-dimensional/3-dimensional registration. During WB, medial pivot and bicondylar rollback were observed. During non-WB, both the medial and lateral condyles moved significantly more anteriorly as compared to the WB state. These patients were divided into 2 groups according to their PTS. The large PTS group showed a significant posterior displacement of the medial femoral condyle as compared with the small PTS group, but no significant difference was observed at the lateral femoral condyle during both WB and non-WB. The PTS influenced knee kinematics through gravity (124/125).
authors.affiliation: Department of Orthopedic Surgery, Chugoku Rousai Hospital, Kure, Hiroshima, Japan.
authors.forename: Eisaku
authors.initials: E
authors.lastname: Fujimoto
authors.affiliation: Department of Orthopedic Surgery, Chugoku Rousai Hospital, Kure, Hiroshima, Japan.
authors.forename: Yoshiaki
authors.initials: Y
authors.lastname: Sasashige
authors.affiliation: Department of Orthopedic Biomaterial Science, Osaka University Graduate School of Medicine, Suita, Osaka, Japan.
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Tomita
authors.affiliation: Department of Orthopedic Biomaterial Science, Osaka University Graduate School of Medicine, Suita, Osaka, Japan.
authors.forename: Keiji
authors.initials: K
authors.lastname: Iwamoto
authors.affiliation: Department of Orthopedic Surgery, Chugoku Rousai Hospital, Kure, Hiroshima, Japan.
authors.forename: Yasuji
authors.initials: Y
authors.lastname: Masuda
authors.affiliation: Department of Orthopedic Surgery, Chugoku Rousai Hospital, Kure, Hiroshima, Japan.
authors.forename: Takashi
authors.initials: T
authors.lastname: Hisatome
mesh_terms: D000368:Aged; D019645:Arthroplasty, Replacement, Knee / Q000379:methods; D001696:Biomechanical Phenomena; D005260:Female; D006801:Humans; D007719:Knee Joint / Q000503:physiopathology* / Q000601:surgery; D008297:Male; D020370:Osteoarthritis, Knee / Q000503:physiopathology* / Q000601:surgery; D016119:Posterior Cruciate Ligament / Q000601:surgery; D016059:Range of Motion, Articular / Q000502:physiology; D013977:Tibia / Q000503:physiopathology* / Q000601:surgery*; D016474:Weight-Bearing / Q000502:physiology*
keywords: 2D/3D registration; cruciate-retaining total knee arthroplasty; flexion angle; kinematics; posterior cruciate ligament; range of motion; tibial slope