Kinematic-axis locating device for knee arthroplasty

A kinematic-axis locating device for knee arthroplasty, the kinematic-axis locating device comprising two spoon-shaped arms and a linking piece, the two spoon-shaped arms being at one side of the linking piece together, the two spoon-shaped arms being shaped symmetrically and curved to correspond to curvatures of a patient's medial condyle femur and lateral condyle femur at respective vector sphere surfaces, the two spoon-shaped arms being configured to be placed between the patient's proximal tibia and the distal femur along a sagittal axis, the proximal tibia and the distal femur being such checked by ligaments that the medial condyle and the lateral condyle using their respective curvatures to hold the two spoon-shaped arms at the patient's tibial plateau, the linking piece naturally defining a reference axis when the two spoon-shaped arms are held in position, and the reference axis being roughly parallel to a kinematic axis upon which the medial condyle and the lateral condyle pivot against the tibial plateau, so that the reference axis can be used as a reference for articular surface resection between the proximal tibia and the distal femur;

• wherein the linking piece has a lengthwise, linearly extending, rectangular body, and the two spoon-shaped arms include an immovable spoon-shaped arm that is integratedly formed at one end of the linking piece and a movable spoon-shaped arm that is movably attached to the linking piece so as to slide in a length direction of the linking piece for adjusting an interval between the movable spoon-shaped arm and the immovable spoon-shaped arm and then being fixed to the linking piece;
• and
• wherein the movable spoon-shaped arm has an end provided with a sliding sleeve, the sliding sleeve having an inner contour corresponding to a sectional contour of the linking piece, and the end being configured to be such mounted around the linking piece that the sliding sleeve is allowed to slide along the length direction.