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Fig. 1 | Journal of Orthopaedic Surgery and Research

Fig. 1

From: The biomechanical effect of different posterior tibial slopes on the tibiofemoral joint after posterior-stabilized total knee arthroplasty

Fig. 1

The experimental process and setup for biomechanical testing. a The experimental process and the custom testing jig for the femur and tibia. The arrows indicate the degrees of freedom allowed during testing (flexion/extension, internal/external rotation, varus/valgus, medial/lateral translation, anterior/posterior translation, and proximal/distal translation). b The real-time feedback of the contact pressure map in the Tekscan software. c The Tekscan sensor was inserted into the medial and lateral compartments of the tibiofemoral joint and secured to the posterior aspect of the tibia by suture anchors. d The local coordinate systems of the femur and tibia segments. Eight knee anatomic markers (the medial and lateral condyle of the tibia and femur, two points parallel to the shaft of the femur, and two points parallel to the shaft of the tibia) were used to create the local coordinate systems for the femur and tibia segments. The midpoint of the femoral condyle was identified as the condyle center and defined as the origin of the femur coordinate. The midpoint of the tibial condyle was defined as the origin of the tibia coordinate. The midpoints between the femoral condyle center and the medial and lateral condyle of the femur were used to represent approximately the centers of the medial and lateral condyle and to describe the posterior translations of the medial and lateral condyle

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