A mechanical comparison of 2 posterior-stabilizing designs: Insall/Burstein 2 knee and Bisurface knee.
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.
Akagi
Masao
M
Department of Orthopaedic Surgery, Kinki University School of Medicine, Osaka, Japan.
Ueo
Toyoji
T
Takagi
Haruki
H
Hamanishi
Chiaki
C
Nakamura
Takashi
T
D019645:Arthroplasty, Replacement, Knee; D001696:Biomechanical Phenomena; D007720:Knee Prosthesis; D011474:Prosthesis Design