Urs Wyss,Shahram Amiri,Theodore Derek Vernon Cooke
申请号：
US13389950
公开号：
US20120179265A1
申请日:
2010.08.10
申请国别(地区):
US
年份:
2012
代理人:
摘要：
A knee prosthesis for a knee joint with a medial ball-like femoral condyle and with a width “w” is characterized on the lateral compartment by:—a trace-line “Lt1” of contact points “Pt1” for the tibia component (2) as a predetermined curve (15) on a spherical surface “Sc1”, which has its centre at the centre Mb of the medial ball 1 and which has a radius in the range “Rc1”=0.65w+/−0.25w—a trace-line “Lt2” of common contact points “Pt2” at given flexion angles γ for a similar spherical surface “Sc2” attached to the femoral component with radius “Rc2”=Rc1, whereby at a given flexion angle γ there exists a plane “E1” through the centre Mb and the common contact point Pt1/Pt2, which contains the same guiding curves “Bi”, “Be” on the tibial and on the femoral components, “Bi” towards medial and “Be” towards lateral, both of which stay in a geometrically fixed relation to the common contact point Pt1/Pt2, and—guiding curves “Bi” and “Be”, which generate an enforced gliding and rolling movement in both directions.
