The Clinical Anatomical Study On The Structure Of The Knee Joint

1. Anatomic rotational relationships of the proximal tibia distalfemur and patellaObjective: Throughing measure the MRI of knee:1) to quanitify the relationships of the femoral epicondylar axis, posterior femoral axis, posterior tibial axis and patellar axis in normal knees during full extension. 2) to determine where the short axis of a tibial tray intersects the patellar ligament as a function of tibial component rotation in the coronal plane.Methods: Axes were constructed at the following anatomic sties using a computer workstation: PT condyle, FE, PE condyle, transverse PL and PAT transverse axes. The PT condylar axis was obtained from an axial slice 8 mm distal to the tibial hyaline cartilage surface. The axis was formed using a line connecting the surfaces of the posterior cortex of the medial and lateral tibial condyles. The transverse PL axis was defined as the line that connects the medial and lateral edges of the PL. The axial image best showing the medial and lateral femoral epicondyles was used to obtain the femoral epicondylar axis. The axis was established by drawing a line through the center of the medial and lateral epicondyles. This same slice was used to obtain the posterior femoral epicondylar axis by connecting the surfaces of the subarticular cortex of the medial and lateral posterior femoral condyles. The PAT transverse axis was established by connecting the hyaline cartilage-bone junction at the medial lateral edges of the patella obtained from the MRI slice that bisected the patella in the proximal-distal direction. Angles between the axes of the selected landmarks were caculated, and linear regression were performed to assess the strength of the relationship between the axes. Correlation coefficients ( r2 ) were caculated among the 4 axes. To eximine the right placement of tibia components in TKA, tibial baseplate tracings were...