title: A mechanical comparison of 2 posterior-stabilizing designs: Insall/Burstein 2 knee and Bisurface knee.
abstract: A posterior-stabilizing knee prosthesis, called the Bisurface knee (Kyocera Corp, Kyoto, Japan), with a ball-and-socket joint installed in the midposterior portion of the tibiofemoral joint, has been developed to satisfy 2 conflicting demands in knee joint design: kinematics and wear resistance. To confirm if the prosthesis has achieved its design objectives, a contact area and stress study was done throughout the range of motion and compared with results obtained for the Insall-Burstein 2 knee. The posterior-stabilizing ability of the ball-and-socket joint also was assessed. This study showed that the ball-and-socket joint could provide sufficient posterior stability, earlier start of flexion, and lower contact stress in the tibial polyethylene insert in flexion. The design of the Bisurface knee could provide a good balance between kinematics, stability, and wear resistance.
authors.affiliation: Department of Orthopaedic Surgery, Kinki University School of Medicine, Osaka, Japan.
authors.forename: Masao
authors.initials: M
authors.lastname: Akagi
authors.forename: Toyoji
authors.initials: T
authors.lastname: Ueo
authors.forename: Haruki
authors.initials: H
authors.lastname: Takagi
authors.forename: Chiaki
authors.initials: C
authors.lastname: Hamanishi
authors.forename: Takashi
authors.initials: T
authors.lastname: Nakamura
mesh_terms: D019645:Arthroplasty, Replacement, Knee; D001696:Biomechanical Phenomena; D007720:Knee Prosthesis; D011474:Prosthesis Design